Caishunqi
vue.2.2.1版本

/*!
 *转载自https://unpkg.com/[email protected]/dist/vue.js
 * Vue.js v2.2.1
 * (c) 2014-2017 Evan You
 * Released under the MIT License.
 */
(function (global, factory) {
    typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
        typeof define === 'function' && define.amd ? define(factory) :
            (global.Vue = factory());
}(this, (function () { 'use strict';

    /*  */

    /**
     * Convert a value to a string that is actually rendered.
     */
    function _toString (val) {
        return val == null
            ? ''
            : typeof val === 'object'
                ? JSON.stringify(val, null, 2)
                : String(val)
    }

    /**
     * Convert a input value to a number for persistence.
     * If the conversion fails, return original string.
     */
    function toNumber (val) {
        var n = parseFloat(val);
        return isNaN(n) ? val : n
    }

    /**
     * Make a map and return a function for checking if a key
     * is in that map.
     */
    function makeMap (
        str,
        expectsLowerCase
    ) {
        var map = Object.create(null);
        var list = str.split(',');
        for (var i = 0; i < list.length; i++) {
            map[list[i]] = true;
        }
        return expectsLowerCase
            ? function (val) { return map[val.toLowerCase()]; }
            : function (val) { return map[val]; }
    }

    /**
     * Check if a tag is a built-in tag.
     */
    var isBuiltInTag = makeMap('slot,component', true);

    /**
     * Remove an item from an array
     */
    function remove (arr, item) {
        if (arr.length) {
            var index = arr.indexOf(item);
            if (index > -1) {
                return arr.splice(index, 1)
            }
        }
    }

    /**
     * Check whether the object has the property.
     */
    var hasOwnProperty = Object.prototype.hasOwnProperty;
    function hasOwn (obj, key) {
        return hasOwnProperty.call(obj, key)
    }

    /**
     * Check if value is primitive
     */
    function isPrimitive (value) {
        return typeof value === 'string' || typeof value === 'number'
    }

    /**
     * Create a cached version of a pure function.
     */
    function cached (fn) {
        var cache = Object.create(null);
        return (function cachedFn (str) {
            var hit = cache[str];
            return hit || (cache[str] = fn(str))
        })
    }

    /**
     * Camelize a hyphen-delimited string.
     */
    var camelizeRE = /-(\w)/g;
    var camelize = cached(function (str) {
        return str.replace(camelizeRE, function (_, c) { return c ? c.toUpperCase() : ''; })
    });

    /**
     * Capitalize a string.
     */
    var capitalize = cached(function (str) {
        return str.charAt(0).toUpperCase() + str.slice(1)
    });

    /**
     * Hyphenate a camelCase string.
     */
    var hyphenateRE = /([^-])([A-Z])/g;
    var hyphenate = cached(function (str) {
        return str
            .replace(hyphenateRE, '$1-$2')
            .replace(hyphenateRE, '$1-$2')
            .toLowerCase()
    });

    /**
     * Simple bind, faster than native
     */
    function bind (fn, ctx) {
        function boundFn (a) {
            var l = arguments.length;
            return l
                ? l > 1
                    ? fn.apply(ctx, arguments)
                    : fn.call(ctx, a)
                : fn.call(ctx)
        }
        // record original fn length
        boundFn._length = fn.length;
        return boundFn
    }

    /**
     * Convert an Array-like object to a real Array.
     */
    function toArray (list, start) {
        start = start || 0;
        var i = list.length - start;
        var ret = new Array(i);
        while (i--) {
            ret[i] = list[i + start];
        }
        return ret
    }

    /**
     * Mix properties into target object.
     */
    function extend (to, _from) {
        for (var key in _from) {
            to[key] = _from[key];
        }
        return to
    }

    /**
     * Quick object check - this is primarily used to tell
     * Objects from primitive values when we know the value
     * is a JSON-compliant type.
     */
    function isObject (obj) {
        return obj !== null && typeof obj === 'object'
    }

    /**
     * Strict object type check. Only returns true
     * for plain JavaScript objects.
     */
    var toString = Object.prototype.toString;
    var OBJECT_STRING = '[object Object]';
    function isPlainObject (obj) {
        return toString.call(obj) === OBJECT_STRING
    }

    /**
     * Merge an Array of Objects into a single Object.
     */
    function toObject (arr) {
        var res = {};
        for (var i = 0; i < arr.length; i++) {
            if (arr[i]) {
                extend(res, arr[i]);
            }
        }
        return res
    }

    /**
     * Perform no operation.
     */
    function noop () {}

    /**
     * Always return false.
     */
    var no = function () { return false; };

    /**
     * Return same value
     */
    var identity = function (_) { return _; };

    /**
     * Generate a static keys string from compiler modules.
     */
    function genStaticKeys (modules) {
        return modules.reduce(function (keys, m) {
            return keys.concat(m.staticKeys || [])
        }, []).join(',')
    }

    /**
     * Check if two values are loosely equal - that is,
     * if they are plain objects, do they have the same shape?
     */
    function looseEqual (a, b) {
        var isObjectA = isObject(a);
        var isObjectB = isObject(b);
        if (isObjectA && isObjectB) {
            return JSON.stringify(a) === JSON.stringify(b)
        } else if (!isObjectA && !isObjectB) {
            return String(a) === String(b)
        } else {
            return false
        }
    }

    function looseIndexOf (arr, val) {
        for (var i = 0; i < arr.length; i++) {
            if (looseEqual(arr[i], val)) { return i }
        }
        return -1
    }

    /**
     * Ensure a function is called only once.
     */
    function once (fn) {
        var called = false;
        return function () {
            if (!called) {
                called = true;
                fn();
            }
        }
    }

    /*  */

    var config = {
        /**
         * Option merge strategies (used in core/util/options)
         */
        optionMergeStrategies: Object.create(null),

        /**
         * Whether to suppress warnings.
         */
        silent: false,

        /**
         * Show production mode tip message on boot?
         */
        productionTip: "development" !== 'production',

        /**
         * Whether to enable devtools
         */
        devtools: "development" !== 'production',

        /**
         * Whether to record perf
         */
        performance: "development" !== 'production',

        /**
         * Error handler for watcher errors
         */
        errorHandler: null,

        /**
         * Ignore certain custom elements
         */
        ignoredElements: [],

        /**
         * Custom user key aliases for v-on
         */
        keyCodes: Object.create(null),

        /**
         * Check if a tag is reserved so that it cannot be registered as a
         * component. This is platform-dependent and may be overwritten.
         */
        isReservedTag: no,

        /**
         * Check if a tag is an unknown element.
         * Platform-dependent.
         */
        isUnknownElement: no,

        /**
         * Get the namespace of an element
         */
        getTagNamespace: noop,

        /**
         * Parse the real tag name for the specific platform.
         */
        parsePlatformTagName: identity,

        /**
         * Check if an attribute must be bound using property, e.g. value
         * Platform-dependent.
         */
        mustUseProp: no,

        /**
         * List of asset types that a component can own.
         */
        _assetTypes: [
            'component',
            'directive',
            'filter'
        ],

        /**
         * List of lifecycle hooks.
         */
        _lifecycleHooks: [
            'beforeCreate',
            'created',
            'beforeMount',
            'mounted',
            'beforeUpdate',
            'updated',
            'beforeDestroy',
            'destroyed',
            'activated',
            'deactivated'
        ],

        /**
         * Max circular updates allowed in a scheduler flush cycle.
         */
        _maxUpdateCount: 100
    };

    /*  */
    /* globals MutationObserver */

// can we use __proto__?
    var hasProto = '__proto__' in {};

// Browser environment sniffing
    var inBrowser = typeof window !== 'undefined';
    var UA = inBrowser && window.navigator.userAgent.toLowerCase();
    var isIE = UA && /msie|trident/.test(UA);
    var isIE9 = UA && UA.indexOf('msie 9.0') > 0;
    var isEdge = UA && UA.indexOf('edge/') > 0;
    var isAndroid = UA && UA.indexOf('android') > 0;
    var isIOS = UA && /iphone|ipad|ipod|ios/.test(UA);
    var isChrome = UA && /chrome\/\d+/.test(UA) && !isEdge;

// this needs to be lazy-evaled because vue may be required before
// vue-server-renderer can set VUE_ENV
    var _isServer;
    var isServerRendering = function () {
        if (_isServer === undefined) {
            /* istanbul ignore if */
            if (!inBrowser && typeof global !== 'undefined') {
                // detect presence of vue-server-renderer and avoid
                // Webpack shimming the process
                _isServer = global['process'].env.VUE_ENV === 'server';
            } else {
                _isServer = false;
            }
        }
        return _isServer
    };

// detect devtools
    var devtools = inBrowser && window.__VUE_DEVTOOLS_GLOBAL_HOOK__;

    /* istanbul ignore next */
    function isNative (Ctor) {
        return /native code/.test(Ctor.toString())
    }

    var hasSymbol =
        typeof Symbol !== 'undefined' && isNative(Symbol) &&
        typeof Reflect !== 'undefined' && isNative(Reflect.ownKeys);

    /**
     * Defer a task to execute it asynchronously.
     */
    var nextTick = (function () {
        var callbacks = [];
        var pending = false;
        var timerFunc;

        function nextTickHandler () {
            pending = false;
            var copies = callbacks.slice(0);
            callbacks.length = 0;
            for (var i = 0; i < copies.length; i++) {
                copies[i]();
            }
        }

        // the nextTick behavior leverages the microtask queue, which can be accessed
        // via either native Promise.then or MutationObserver.
        // MutationObserver has wider support, however it is seriously bugged in
        // UIWebView in iOS >= 9.3.3 when triggered in touch event handlers. It
        // completely stops working after triggering a few times... so, if native
        // Promise is available, we will use it:
        /* istanbul ignore if */
        if (typeof Promise !== 'undefined' && isNative(Promise)) {
            var p = Promise.resolve();
            var logError = function (err) { console.error(err); };
            timerFunc = function () {
                p.then(nextTickHandler).catch(logError);
                // in problematic UIWebViews, Promise.then doesn't completely break, but
                // it can get stuck in a weird state where callbacks are pushed into the
                // microtask queue but the queue isn't being flushed, until the browser
                // needs to do some other work, e.g. handle a timer. Therefore we can
                // "force" the microtask queue to be flushed by adding an empty timer.
                if (isIOS) { setTimeout(noop); }
            };
        } else if (typeof MutationObserver !== 'undefined' && (
                isNative(MutationObserver) ||
                // PhantomJS and iOS 7.x
                MutationObserver.toString() === '[object MutationObserverConstructor]'
            )) {
            // use MutationObserver where native Promise is not available,
            // e.g. PhantomJS IE11, iOS7, Android 4.4
            var counter = 1;
            var observer = new MutationObserver(nextTickHandler);
            var textNode = document.createTextNode(String(counter));
            observer.observe(textNode, {
                characterData: true
            });
            timerFunc = function () {
                counter = (counter + 1) % 2;
                textNode.data = String(counter);
            };
        } else {
            // fallback to setTimeout
            /* istanbul ignore next */
            timerFunc = function () {
                setTimeout(nextTickHandler, 0);
            };
        }

        return function queueNextTick (cb, ctx) {
            var _resolve;
            callbacks.push(function () {
                if (cb) { cb.call(ctx); }
                if (_resolve) { _resolve(ctx); }
            });
            if (!pending) {
                pending = true;
                timerFunc();
            }
            if (!cb && typeof Promise !== 'undefined') {
                return new Promise(function (resolve) {
                    _resolve = resolve;
                })
            }
        }
    })();

    var _Set;
    /* istanbul ignore if */
    if (typeof Set !== 'undefined' && isNative(Set)) {
        // use native Set when available.
        _Set = Set;
    } else {
        // a non-standard Set polyfill that only works with primitive keys.
        _Set = (function () {
            function Set () {
                this.set = Object.create(null);
            }
            Set.prototype.has = function has (key) {
                return this.set[key] === true
            };
            Set.prototype.add = function add (key) {
                this.set[key] = true;
            };
            Set.prototype.clear = function clear () {
                this.set = Object.create(null);
            };

            return Set;
        }());
    }

    var perf;

    {
        perf = inBrowser && window.performance;
        if (perf && (!perf.mark || !perf.measure)) {
            perf = undefined;
        }
    }

    /*  */

    var emptyObject = Object.freeze({});

    /**
     * Check if a string starts with $ or _
     */
    function isReserved (str) {
        var c = (str + '').charCodeAt(0);
        return c === 0x24 || c === 0x5F
    }

    /**
     * Define a property.
     */
    function def (obj, key, val, enumerable) {
        Object.defineProperty(obj, key, {
            value: val,
            enumerable: !!enumerable,
            writable: true,
            configurable: true
        });
    }

    /**
     * Parse simple path.
     */
    var bailRE = /[^\w.$]/;
    function parsePath (path) {
        if (bailRE.test(path)) {
            return
        } else {
            var segments = path.split('.');
            return function (obj) {
                for (var i = 0; i < segments.length; i++) {
                    if (!obj) { return }
                    obj = obj[segments[i]];
                }
                return obj
            }
        }
    }

    var warn = noop;
    var tip = noop;
    var formatComponentName;

    {
        var hasConsole = typeof console !== 'undefined';
        var classifyRE = /(?:^|[-_])(\w)/g;
        var classify = function (str) { return str
            .replace(classifyRE, function (c) { return c.toUpperCase(); })
            .replace(/[-_]/g, ''); };

        warn = function (msg, vm) {
            if (hasConsole && (!config.silent)) {
                console.error("[Vue warn]: " + msg + " " + (
                    vm ? formatLocation(formatComponentName(vm)) : ''
                ));
            }
        };

        tip = function (msg, vm) {
            if (hasConsole && (!config.silent)) {
                console.warn("[Vue tip]: " + msg + " " + (
                    vm ? formatLocation(formatComponentName(vm)) : ''
                ));
            }
        };

        formatComponentName = function (vm, includeFile) {
            if (vm.$root === vm) {
                return ''
            }
            var name = vm._isVue
                ? vm.$options.name || vm.$options._componentTag
                : vm.name;

            var file = vm._isVue && vm.$options.__file;
            if (!name && file) {
                var match = file.match(/([^/\\]+)\.vue$/);
                name = match && match[1];
            }

            return (
                (name ? ("<" + (classify(name)) + ">") : "") +
                (file && includeFile !== false ? (" at " + file) : '')
            )
        };

        var formatLocation = function (str) {
            if (str === "") {
                str += " - use the \"name\" option for better debugging messages.";
            }
            return ("\n(found in " + str + ")")
        };
    }

    /*  */


    var uid$1 = 0;

    /**
     * A dep is an observable that can have multiple
     * directives subscribing to it.
     */
    var Dep = function Dep () {
        this.id = uid$1++;
        this.subs = [];
    };

    Dep.prototype.addSub = function addSub (sub) {
        this.subs.push(sub);
    };

    Dep.prototype.removeSub = function removeSub (sub) {
        remove(this.subs, sub);
    };

    Dep.prototype.depend = function depend () {
        if (Dep.target) {
            Dep.target.addDep(this);
        }
    };

    Dep.prototype.notify = function notify () {
        // stablize the subscriber list first
        var subs = this.subs.slice();
        for (var i = 0, l = subs.length; i < l; i++) {
            subs[i].update();
        }
    };

// the current target watcher being evaluated.
// this is globally unique because there could be only one
// watcher being evaluated at any time.
    Dep.target = null;
    var targetStack = [];

    function pushTarget (_target) {
        if (Dep.target) { targetStack.push(Dep.target); }
        Dep.target = _target;
    }

    function popTarget () {
        Dep.target = targetStack.pop();
    }

    /*
 * not type checking this file because flow doesn't play well with
 * dynamically accessing methods on Array prototype
 */

    var arrayProto = Array.prototype;
    var arrayMethods = Object.create(arrayProto);[
        'push',
        'pop',
        'shift',
        'unshift',
        'splice',
        'sort',
        'reverse'
    ]
        .forEach(function (method) {
            // cache original method
            var original = arrayProto[method];
            def(arrayMethods, method, function mutator () {
                var arguments$1 = arguments;

                // avoid leaking arguments:
                // http://jsperf.com/closure-with-arguments
                var i = arguments.length;
                var args = new Array(i);
                while (i--) {
                    args[i] = arguments$1[i];
                }
                var result = original.apply(this, args);
                var ob = this.__ob__;
                var inserted;
                switch (method) {
                    case 'push':
                        inserted = args;
                        break
                    case 'unshift':
                        inserted = args;
                        break
                    case 'splice':
                        inserted = args.slice(2);
                        break
                }
                if (inserted) { ob.observeArray(inserted); }
                // notify change
                ob.dep.notify();
                return result
            });
        });

    /*  */

    var arrayKeys = Object.getOwnPropertyNames(arrayMethods);

    /**
     * By default, when a reactive property is set, the new value is
     * also converted to become reactive. However when passing down props,
     * we don't want to force conversion because the value may be a nested value
     * under a frozen data structure. Converting it would defeat the optimization.
     */
    var observerState = {
        shouldConvert: true,
        isSettingProps: false
    };

    /**
     * Observer class that are attached to each observed
     * object. Once attached, the observer converts target
     * object's property keys into getter/setters that
     * collect dependencies and dispatches updates.
     */
    var Observer = function Observer (value) {
        this.value = value;
        this.dep = new Dep();
        this.vmCount = 0;
        def(value, '__ob__', this);
        if (Array.isArray(value)) {
            var augment = hasProto
                ? protoAugment
                : copyAugment;
            augment(value, arrayMethods, arrayKeys);
            this.observeArray(value);
        } else {
            this.walk(value);
        }
    };

    /**
     * Walk through each property and convert them into
     * getter/setters. This method should only be called when
     * value type is Object.
     */
    Observer.prototype.walk = function walk (obj) {
        var keys = Object.keys(obj);
        for (var i = 0; i < keys.length; i++) {
            defineReactive$$1(obj, keys[i], obj[keys[i]]);
        }
    };

    /**
     * Observe a list of Array items.
     */
    Observer.prototype.observeArray = function observeArray (items) {
        for (var i = 0, l = items.length; i < l; i++) {
            observe(items[i]);
        }
    };

// helpers

    /**
     * Augment an target Object or Array by intercepting
     * the prototype chain using __proto__
     */
    function protoAugment (target, src) {
        /* eslint-disable no-proto */
        target.__proto__ = src;
        /* eslint-enable no-proto */
    }

    /**
     * Augment an target Object or Array by defining
     * hidden properties.
     */
    /* istanbul ignore next */
    function copyAugment (target, src, keys) {
        for (var i = 0, l = keys.length; i < l; i++) {
            var key = keys[i];
            def(target, key, src[key]);
        }
    }

    /**
     * Attempt to create an observer instance for a value,
     * returns the new observer if successfully observed,
     * or the existing observer if the value already has one.
     */
    function observe (value, asRootData) {
        if (!isObject(value)) {
            return
        }
        var ob;
        if (hasOwn(value, '__ob__') && value.__ob__ instanceof Observer) {
            ob = value.__ob__;
        } else if (
            observerState.shouldConvert &&
            !isServerRendering() &&
            (Array.isArray(value) || isPlainObject(value)) &&
            Object.isExtensible(value) &&
            !value._isVue
        ) {
            ob = new Observer(value);
        }
        if (asRootData && ob) {
            ob.vmCount++;
        }
        return ob
    }

    /**
     * Define a reactive property on an Object.
     */
    function defineReactive$$1 (
        obj,
        key,
        val,
        customSetter
    ) {
        var dep = new Dep();

        var property = Object.getOwnPropertyDescriptor(obj, key);
        if (property && property.configurable === false) {
            return
        }

        // cater for pre-defined getter/setters
        var getter = property && property.get;
        var setter = property && property.set;

        var childOb = observe(val);
        Object.defineProperty(obj, key, {
            enumerable: true,
            configurable: true,
            get: function reactiveGetter () {
                var value = getter ? getter.call(obj) : val;
                if (Dep.target) {
                    dep.depend();
                    if (childOb) {
                        childOb.dep.depend();
                    }
                    if (Array.isArray(value)) {
                        dependArray(value);
                    }
                }
                return value
            },
            set: function reactiveSetter (newVal) {
                var value = getter ? getter.call(obj) : val;
                /* eslint-disable no-self-compare */
                if (newVal === value || (newVal !== newVal && value !== value)) {
                    return
                }
                /* eslint-enable no-self-compare */
                if ("development" !== 'production' && customSetter) {
                    customSetter();
                }
                if (setter) {
                    setter.call(obj, newVal);
                } else {
                    val = newVal;
                }
                childOb = observe(newVal);
                dep.notify();
            }
        });
    }

    /**
     * Set a property on an object. Adds the new property and
     * triggers change notification if the property doesn't
     * already exist.
     */
    function set (obj, key, val) {
        if (Array.isArray(obj)) {
            obj.length = Math.max(obj.length, key);
            obj.splice(key, 1, val);
            return val
        }
        if (hasOwn(obj, key)) {
            obj[key] = val;
            return
        }
        var ob = obj.__ob__;
        if (obj._isVue || (ob && ob.vmCount)) {
            "development" !== 'production' && warn(
                'Avoid adding reactive properties to a Vue instance or its root $data ' +
                'at runtime - declare it upfront in the data option.'
            );
            return
        }
        if (!ob) {
            obj[key] = val;
            return
        }
        defineReactive$$1(ob.value, key, val);
        ob.dep.notify();
        return val
    }

    /**
     * Delete a property and trigger change if necessary.
     */
    function del (obj, key) {
        if (Array.isArray(obj)) {
            obj.splice(key, 1);
            return
        }
        var ob = obj.__ob__;
        if (obj._isVue || (ob && ob.vmCount)) {
            "development" !== 'production' && warn(
                'Avoid deleting properties on a Vue instance or its root $data ' +
                '- just set it to null.'
            );
            return
        }
        if (!hasOwn(obj, key)) {
            return
        }
        delete obj[key];
        if (!ob) {
            return
        }
        ob.dep.notify();
    }

    /**
     * Collect dependencies on array elements when the array is touched, since
     * we cannot intercept array element access like property getters.
     */
    function dependArray (value) {
        for (var e = (void 0), i = 0, l = value.length; i < l; i++) {
            e = value[i];
            e && e.__ob__ && e.__ob__.dep.depend();
            if (Array.isArray(e)) {
                dependArray(e);
            }
        }
    }

    /*  */

    /**
     * Option overwriting strategies are functions that handle
     * how to merge a parent option value and a child option
     * value into the final value.
     */
    var strats = config.optionMergeStrategies;

    /**
     * Options with restrictions
     */
    {
        strats.el = strats.propsData = function (parent, child, vm, key) {
            if (!vm) {
                warn(
                    "option \"" + key + "\" can only be used during instance " +
                    'creation with the `new` keyword.'
                );
            }
            return defaultStrat(parent, child)
        };
    }

    /**
     * Helper that recursively merges two data objects together.
     */
    function mergeData (to, from) {
        if (!from) { return to }
        var key, toVal, fromVal;
        var keys = Object.keys(from);
        for (var i = 0; i < keys.length; i++) {
            key = keys[i];
            toVal = to[key];
            fromVal = from[key];
            if (!hasOwn(to, key)) {
                set(to, key, fromVal);
            } else if (isPlainObject(toVal) && isPlainObject(fromVal)) {
                mergeData(toVal, fromVal);
            }
        }
        return to
    }

    /**
     * Data
     */
    strats.data = function (
        parentVal,
        childVal,
        vm
    ) {
        if (!vm) {
            // in a Vue.extend merge, both should be functions
            if (!childVal) {
                return parentVal
            }
            if (typeof childVal !== 'function') {
                "development" !== 'production' && warn(
                    'The "data" option should be a function ' +
                    'that returns a per-instance value in component ' +
                    'definitions.',
                    vm
                );
                return parentVal
            }
            if (!parentVal) {
                return childVal
            }
            // when parentVal & childVal are both present,
            // we need to return a function that returns the
            // merged result of both functions... no need to
            // check if parentVal is a function here because
            // it has to be a function to pass previous merges.
            return function mergedDataFn () {
                return mergeData(
                    childVal.call(this),
                    parentVal.call(this)
                )
            }
        } else if (parentVal || childVal) {
            return function mergedInstanceDataFn () {
                // instance merge
                var instanceData = typeof childVal === 'function'
                    ? childVal.call(vm)
                    : childVal;
                var defaultData = typeof parentVal === 'function'
                    ? parentVal.call(vm)
                    : undefined;
                if (instanceData) {
                    return mergeData(instanceData, defaultData)
                } else {
                    return defaultData
                }
            }
        }
    };

    /**
     * Hooks and props are merged as arrays.
     */
    function mergeHook (
        parentVal,
        childVal
    ) {
        return childVal
            ? parentVal
                ? parentVal.concat(childVal)
                : Array.isArray(childVal)
                    ? childVal
                    : [childVal]
            : parentVal
    }

    config._lifecycleHooks.forEach(function (hook) {
        strats[hook] = mergeHook;
    });

    /**
     * Assets
     *
     * When a vm is present (instance creation), we need to do
     * a three-way merge between constructor options, instance
     * options and parent options.
     */
    function mergeAssets (parentVal, childVal) {
        var res = Object.create(parentVal || null);
        return childVal
            ? extend(res, childVal)
            : res
    }

    config._assetTypes.forEach(function (type) {
        strats[type + 's'] = mergeAssets;
    });

    /**
     * Watchers.
     *
     * Watchers hashes should not overwrite one
     * another, so we merge them as arrays.
     */
    strats.watch = function (parentVal, childVal) {
        /* istanbul ignore if */
        if (!childVal) { return Object.create(parentVal || null) }
        if (!parentVal) { return childVal }
        var ret = {};
        extend(ret, parentVal);
        for (var key in childVal) {
            var parent = ret[key];
            var child = childVal[key];
            if (parent && !Array.isArray(parent)) {
                parent = [parent];
            }
            ret[key] = parent
                ? parent.concat(child)
                : [child];
        }
        return ret
    };

    /**
     * Other object hashes.
     */
    strats.props =
        strats.methods =
            strats.computed = function (parentVal, childVal) {
                if (!childVal) { return Object.create(parentVal || null) }
                if (!parentVal) { return childVal }
                var ret = Object.create(null);
                extend(ret, parentVal);
                extend(ret, childVal);
                return ret
            };

    /**
     * Default strategy.
     */
    var defaultStrat = function (parentVal, childVal) {
        return childVal === undefined
            ? parentVal
            : childVal
    };

    /**
     * Validate component names
     */
    function checkComponents (options) {
        for (var key in options.components) {
            var lower = key.toLowerCase();
            if (isBuiltInTag(lower) || config.isReservedTag(lower)) {
                warn(
                    'Do not use built-in or reserved HTML elements as component ' +
                    'id: ' + key
                );
            }
        }
    }

    /**
     * Ensure all props option syntax are normalized into the
     * Object-based format.
     */
    function normalizeProps (options) {
        var props = options.props;
        if (!props) { return }
        var res = {};
        var i, val, name;
        if (Array.isArray(props)) {
            i = props.length;
            while (i--) {
                val = props[i];
                if (typeof val === 'string') {
                    name = camelize(val);
                    res[name] = { type: null };
                } else {
                    warn('props must be strings when using array syntax.');
                }
            }
        } else if (isPlainObject(props)) {
            for (var key in props) {
                val = props[key];
                name = camelize(key);
                res[name] = isPlainObject(val)
                    ? val
                    : { type: val };
            }
        }
        options.props = res;
    }

    /**
     * Normalize raw function directives into object format.
     */
    function normalizeDirectives (options) {
        var dirs = options.directives;
        if (dirs) {
            for (var key in dirs) {
                var def = dirs[key];
                if (typeof def === 'function') {
                    dirs[key] = { bind: def, update: def };
                }
            }
        }
    }

    /**
     * Merge two option objects into a new one.
     * Core utility used in both instantiation and inheritance.
     */
    function mergeOptions (
        parent,
        child,
        vm
    ) {
        {
            checkComponents(child);
        }
        normalizeProps(child);
        normalizeDirectives(child);
        var extendsFrom = child.extends;
        if (extendsFrom) {
            parent = typeof extendsFrom === 'function'
                ? mergeOptions(parent, extendsFrom.options, vm)
                : mergeOptions(parent, extendsFrom, vm);
        }
        if (child.mixins) {
            for (var i = 0, l = child.mixins.length; i < l; i++) {
                var mixin = child.mixins[i];
                if (mixin.prototype instanceof Vue$3) {
                    mixin = mixin.options;
                }
                parent = mergeOptions(parent, mixin, vm);
            }
        }
        var options = {};
        var key;
        for (key in parent) {
            mergeField(key);
        }
        for (key in child) {
            if (!hasOwn(parent, key)) {
                mergeField(key);
            }
        }
        function mergeField (key) {
            var strat = strats[key] || defaultStrat;
            options[key] = strat(parent[key], child[key], vm, key);
        }
        return options
    }

    /**
     * Resolve an asset.
     * This function is used because child instances need access
     * to assets defined in its ancestor chain.
     */
    function resolveAsset (
        options,
        type,
        id,
        warnMissing
    ) {
        /* istanbul ignore if */
        if (typeof id !== 'string') {
            return
        }
        var assets = options[type];
        // check local registration variations first
        if (hasOwn(assets, id)) { return assets[id] }
        var camelizedId = camelize(id);
        if (hasOwn(assets, camelizedId)) { return assets[camelizedId] }
        var PascalCaseId = capitalize(camelizedId);
        if (hasOwn(assets, PascalCaseId)) { return assets[PascalCaseId] }
        // fallback to prototype chain
        var res = assets[id] || assets[camelizedId] || assets[PascalCaseId];
        if ("development" !== 'production' && warnMissing && !res) {
            warn(
                'Failed to resolve ' + type.slice(0, -1) + ': ' + id,
                options
            );
        }
        return res
    }

    /*  */

    function validateProp (
        key,
        propOptions,
        propsData,
        vm
    ) {
        var prop = propOptions[key];
        var absent = !hasOwn(propsData, key);
        var value = propsData[key];
        // handle boolean props
        if (isType(Boolean, prop.type)) {
            if (absent && !hasOwn(prop, 'default')) {
                value = false;
            } else if (!isType(String, prop.type) && (value === '' || value === hyphenate(key))) {
                value = true;
            }
        }
        // check default value
        if (value === undefined) {
            value = getPropDefaultValue(vm, prop, key);
            // since the default value is a fresh copy,
            // make sure to observe it.
            var prevShouldConvert = observerState.shouldConvert;
            observerState.shouldConvert = true;
            observe(value);
            observerState.shouldConvert = prevShouldConvert;
        }
        {
            assertProp(prop, key, value, vm, absent);
        }
        return value
    }

    /**
     * Get the default value of a prop.
     */
    function getPropDefaultValue (vm, prop, key) {
        // no default, return undefined
        if (!hasOwn(prop, 'default')) {
            return undefined
        }
        var def = prop.default;
        // warn against non-factory defaults for Object & Array
        if ("development" !== 'production' && isObject(def)) {
            warn(
                'Invalid default value for prop "' + key + '": ' +
                'Props with type Object/Array must use a factory function ' +
                'to return the default value.',
                vm
            );
        }
        // the raw prop value was also undefined from previous render,
        // return previous default value to avoid unnecessary watcher trigger
        if (vm && vm.$options.propsData &&
            vm.$options.propsData[key] === undefined &&
            vm._props[key] !== undefined) {
            return vm._props[key]
        }
        // call factory function for non-Function types
        // a value is Function if its prototype is function even across different execution context
        return typeof def === 'function' && getType(prop.type) !== 'Function'
            ? def.call(vm)
            : def
    }

    /**
     * Assert whether a prop is valid.
     */
    function assertProp (
        prop,
        name,
        value,
        vm,
        absent
    ) {
        if (prop.required && absent) {
            warn(
                'Missing required prop: "' + name + '"',
                vm
            );
            return
        }
        if (value == null && !prop.required) {
            return
        }
        var type = prop.type;
        var valid = !type || type === true;
        var expectedTypes = [];
        if (type) {
            if (!Array.isArray(type)) {
                type = [type];
            }
            for (var i = 0; i < type.length && !valid; i++) {
                var assertedType = assertType(value, type[i]);
                expectedTypes.push(assertedType.expectedType || '');
                valid = assertedType.valid;
            }
        }
        if (!valid) {
            warn(
                'Invalid prop: type check failed for prop "' + name + '".' +
                ' Expected ' + expectedTypes.map(capitalize).join(', ') +
                ', got ' + Object.prototype.toString.call(value).slice(8, -1) + '.',
                vm
            );
            return
        }
        var validator = prop.validator;
        if (validator) {
            if (!validator(value)) {
                warn(
                    'Invalid prop: custom validator check failed for prop "' + name + '".',
                    vm
                );
            }
        }
    }

    /**
     * Assert the type of a value
     */
    function assertType (value, type) {
        var valid;
        var expectedType = getType(type);
        if (expectedType === 'String') {
            valid = typeof value === (expectedType = 'string');
        } else if (expectedType === 'Number') {
            valid = typeof value === (expectedType = 'number');
        } else if (expectedType === 'Boolean') {
            valid = typeof value === (expectedType = 'boolean');
        } else if (expectedType === 'Function') {
            valid = typeof value === (expectedType = 'function');
        } else if (expectedType === 'Object') {
            valid = isPlainObject(value);
        } else if (expectedType === 'Array') {
            valid = Array.isArray(value);
        } else {
            valid = value instanceof type;
        }
        return {
            valid: valid,
            expectedType: expectedType
        }
    }

    /**
     * Use function string name to check built-in types,
     * because a simple equality check will fail when running
     * across different vms / iframes.
     */
    function getType (fn) {
        var match = fn && fn.toString().match(/^\s*function (\w+)/);
        return match && match[1]
    }

    function isType (type, fn) {
        if (!Array.isArray(fn)) {
            return getType(fn) === getType(type)
        }
        for (var i = 0, len = fn.length; i < len; i++) {
            if (getType(fn[i]) === getType(type)) {
                return true
            }
        }
        /* istanbul ignore next */
        return false
    }

    function handleError (err, vm, type) {
        if (config.errorHandler) {
            config.errorHandler.call(null, err, vm, type);
        } else {
            {
                warn(("Error in " + type + ":"), vm);
            }
            /* istanbul ignore else */
            if (inBrowser && typeof console !== 'undefined') {
                console.error(err);
            } else {
                throw err
            }
        }
    }

    /* not type checking this file because flow doesn't play well with Proxy */

    var initProxy;

    {
        var allowedGlobals = makeMap(
            'Infinity,undefined,NaN,isFinite,isNaN,' +
            'parseFloat,parseInt,decodeURI,decodeURIComponent,encodeURI,encodeURIComponent,' +
            'Math,Number,Date,Array,Object,Boolean,String,RegExp,Map,Set,JSON,Intl,' +
            'require' // for Webpack/Browserify
        );

        var warnNonPresent = function (target, key) {
            warn(
                "Property or method \"" + key + "\" is not defined on the instance but " +
                "referenced during render. Make sure to declare reactive data " +
                "properties in the data option.",
                target
            );
        };

        var hasProxy =
            typeof Proxy !== 'undefined' &&
            Proxy.toString().match(/native code/);

        if (hasProxy) {
            var isBuiltInModifier = makeMap('stop,prevent,self,ctrl,shift,alt,meta');
            config.keyCodes = new Proxy(config.keyCodes, {
                set: function set (target, key, value) {
                    if (isBuiltInModifier(key)) {
                        warn(("Avoid overwriting built-in modifier in config.keyCodes: ." + key));
                        return false
                    } else {
                        target[key] = value;
                        return true
                    }
                }
            });
        }

        var hasHandler = {
            has: function has (target, key) {
                var has = key in target;
                var isAllowed = allowedGlobals(key) || key.charAt(0) === '_';
                if (!has && !isAllowed) {
                    warnNonPresent(target, key);
                }
                return has || !isAllowed
            }
        };

        var getHandler = {
            get: function get (target, key) {
                if (typeof key === 'string' && !(key in target)) {
                    warnNonPresent(target, key);
                }
                return target[key]
            }
        };

        initProxy = function initProxy (vm) {
            if (hasProxy) {
                // determine which proxy handler to use
                var options = vm.$options;
                var handlers = options.render && options.render._withStripped
                    ? getHandler
                    : hasHandler;
                vm._renderProxy = new Proxy(vm, handlers);
            } else {
                vm._renderProxy = vm;
            }
        };
    }

    /*  */

    var VNode = function VNode (
        tag,
        data,
        children,
        text,
        elm,
        context,
        componentOptions
    ) {
        this.tag = tag;
        this.data = data;
        this.children = children;
        this.text = text;
        this.elm = elm;
        this.ns = undefined;
        this.context = context;
        this.functionalContext = undefined;
        this.key = data && data.key;
        this.componentOptions = componentOptions;
        this.componentInstance = undefined;
        this.parent = undefined;
        this.raw = false;
        this.isStatic = false;
        this.isRootInsert = true;
        this.isComment = false;
        this.isCloned = false;
        this.isOnce = false;
    };

    var prototypeAccessors = { child: {} };

// DEPRECATED: alias for componentInstance for backwards compat.
    /* istanbul ignore next */
    prototypeAccessors.child.get = function () {
        return this.componentInstance
    };

    Object.defineProperties( VNode.prototype, prototypeAccessors );

    var createEmptyVNode = function () {
        var node = new VNode();
        node.text = '';
        node.isComment = true;
        return node
    };

    function createTextVNode (val) {
        return new VNode(undefined, undefined, undefined, String(val))
    }

// optimized shallow clone
// used for static nodes and slot nodes because they may be reused across
// multiple renders, cloning them avoids errors when DOM manipulations rely
// on their elm reference.
    function cloneVNode (vnode) {
        var cloned = new VNode(
            vnode.tag,
            vnode.data,
            vnode.children,
            vnode.text,
            vnode.elm,
            vnode.context,
            vnode.componentOptions
        );
        cloned.ns = vnode.ns;
        cloned.isStatic = vnode.isStatic;
        cloned.key = vnode.key;
        cloned.isCloned = true;
        return cloned
    }

    function cloneVNodes (vnodes) {
        var res = new Array(vnodes.length);
        for (var i = 0; i < vnodes.length; i++) {
            res[i] = cloneVNode(vnodes[i]);
        }
        return res
    }

    /*  */

    var normalizeEvent = cached(function (name) {
        var once$$1 = name.charAt(0) === '~'; // Prefixed last, checked first
        name = once$$1 ? name.slice(1) : name;
        var capture = name.charAt(0) === '!';
        name = capture ? name.slice(1) : name;
        return {
            name: name,
            once: once$$1,
            capture: capture
        }
    });

    function createFnInvoker (fns) {
        function invoker () {
            var arguments$1 = arguments;

            var fns = invoker.fns;
            if (Array.isArray(fns)) {
                for (var i = 0; i < fns.length; i++) {
                    fns[i].apply(null, arguments$1);
                }
            } else {
                // return handler return value for single handlers
                return fns.apply(null, arguments)
            }
        }
        invoker.fns = fns;
        return invoker
    }

    function updateListeners (
        on,
        oldOn,
        add,
        remove$$1,
        vm
    ) {
        var name, cur, old, event;
        for (name in on) {
            cur = on[name];
            old = oldOn[name];
            event = normalizeEvent(name);
            if (!cur) {
                "development" !== 'production' && warn(
                    "Invalid handler for event \"" + (event.name) + "\": got " + String(cur),
                    vm
                );
            } else if (!old) {
                if (!cur.fns) {
                    cur = on[name] = createFnInvoker(cur);
                }
                add(event.name, cur, event.once, event.capture);
            } else if (cur !== old) {
                old.fns = cur;
                on[name] = old;
            }
        }
        for (name in oldOn) {
            if (!on[name]) {
                event = normalizeEvent(name);
                remove$$1(event.name, oldOn[name], event.capture);
            }
        }
    }

    /*  */

    function mergeVNodeHook (def, hookKey, hook) {
        var invoker;
        var oldHook = def[hookKey];

        function wrappedHook () {
            hook.apply(this, arguments);
            // important: remove merged hook to ensure it's called only once
            // and prevent memory leak
            remove(invoker.fns, wrappedHook);
        }

        if (!oldHook) {
            // no existing hook
            invoker = createFnInvoker([wrappedHook]);
        } else {
            /* istanbul ignore if */
            if (oldHook.fns && oldHook.merged) {
                // already a merged invoker
                invoker = oldHook;
                invoker.fns.push(wrappedHook);
            } else {
                // existing plain hook
                invoker = createFnInvoker([oldHook, wrappedHook]);
            }
        }

        invoker.merged = true;
        def[hookKey] = invoker;
    }

    /*  */

// The template compiler attempts to minimize the need for normalization by
// statically analyzing the template at compile time.
//
// For plain HTML markup, normalization can be completely skipped because the
// generated render function is guaranteed to return Array. There are
// two cases where extra normalization is needed:

// 1. When the children contains components - because a functional component
// may return an Array instead of a single root. In this case, just a simple
// normalization is needed - if any child is an Array, we flatten the whole
// thing with Array.prototype.concat. It is guaranteed to be only 1-level deep
// because functional components already normalize their own children.
    function simpleNormalizeChildren (children) {
        for (var i = 0; i < children.length; i++) {
            if (Array.isArray(children[i])) {
                return Array.prototype.concat.apply([], children)
            }
        }
        return children
    }

// 2. When the children contains constrcuts that always generated nested Arrays,
// e.g.
vue.2.2.1版本

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