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Vue 测试实例 - 菜鸟教程(runoob.com)
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项目构架
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Vue 测试实例 - 菜鸟教程(runoob.com)
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mvvm.js
class MVVM {
constructor(options) {
this.$el = options.el;
this.$data = options.data;
if (this.$el) {
new Compile(this.$el);
}
}
}
compile.js
把dom节点，放在内存中操作(到35分钟)
class Compile {
constructor(el, vm) {
this.el = this.isElementNode(el) ? el : document.querySelector(el);
this.vm = vm;
if (this.el) {
let fragment = this.node2frament(this.el);
this.compile(fragment);
}
}
//辅助方法
isElementNode(node) {
return node.nodeType === 1;
}
//核心方法
compile(fragment) {
let childNodes = fragment.childNodes;
console.log(childNodes)
}
node2frament(el) {
let fragment = document.createDocumentFragment();
let firstChild;
while (firstChild = el.firstChild) {
fragment.appendChild(firstChild);
}
return fragment
}
}
分类元素节点和文本节点(52分钟)
class Compile {
constructor(el, vm) {
this.el = this.isElementNode(el) ? el : document.querySelector(el);
this.vm = vm;
if (this.el) {
let fragment = this.node2frament(this.el);
this.compile(fragment);
}
}
//辅助方法
isElementNode(node) {
return node.nodeType === 1;
}
isDirective(name) {
return name.includes('v-')
}
//核心方法
compileElement(node) {
let attrs = node.attributes;
Array.from(attrs).forEach(arrt => {
let attrName = attr.name;
if (this.isDirective(attrName)) {
let expr = attr.value;
}
})
}
compileText(node) {
let text = node.textContent;
let reg = /\{\{([^}]+)\}\}/g;
if (reg.test(text)) {
}
}
compile(fragment) {
let childNodes = fragment.childNodes;
Array.from(childNodes).forEach(node => {
if (this.isElementNode(node)) {
this.compile(node)
} else {
console.log('text', node)
}
})
}
node2frament(el) {
let fragment = document.createDocumentFragment();
let firstChild;
while (firstChild = el.firstChild) {
fragment.appendChild(firstChild);
}
return fragment
}
}
把data中的数据，显示在视图上(到1:16分)
class Compile {
constructor(el, vm) {
this.el = this.isElementNode(el) ? el : document.querySelector(el);
this.vm = vm;
if (this.el) {
let fragment = this.node2frament(this.el);
this.compile(fragment);
this.el.appendChild(fragment)
}
}
//辅助方法
isElementNode(node) {
return node.nodeType === 1;
}
isDirective(name) {
return name.includes('v-')
}
//核心方法
compileElement(node) {
let attrs = node.attributes;
Array.from(attrs).forEach(attr => {
let attrName = attr.name;
if (this.isDirective(attrName)) {
let expr = attr.value;
let [, type] = attrName.split('-');
CompileUtil[type](node, this.vm, expr)
}
})
}
compileText(node) {
console.log(node)
let expr = node.textContent;
let reg = /\{\{([^}]+)\}\}/g;
if (reg.test(expr)) {
CompileUtil['text'](node, this.vm, expr)
}
}
compile(fragment) {
let childNodes = fragment.childNodes;
Array.from(childNodes).forEach(node => {
if (this.isElementNode(node)) {
this.compileElement(node)
this.compile(node)
} else {
this.compileText(node)
}
})
}
node2frament(el) {
let fragment = document.createDocumentFragment();
let firstChild;
while (firstChild = el.firstChild) {
fragment.appendChild(firstChild);
}
return fragment
}
}
CompileUtil = {
getVal(vm, expr) { // 获取实例上对应的数据
expr = expr.split('.'); // [message,a]
return expr.reduce((prev, next) => { // vm.$data.a
return prev[next];
}, vm.$data);
},
getTextVal(vm, expr) { // 获取编译文本后的结果
return expr.replace(/\{\{([^}]+)\}\}/g, (...arguments) => {
return this.getVal(vm, arguments[1]);
})
},
text(node, vm, expr) { //文本处理
let updateFn = this.updater['textUpdater'];
let value = this.getTextVal(vm, expr);
updateFn && updateFn(node, value)
},
model(node, vm, expr) {
let updateFn = this.updater['modelUpdater'];
updateFn && updateFn(node, this.getVal(vm, expr));
},
updater: {
textUpdater(node, value) {
node.textContent = value;
},
modelUpdater(node, value) {
node.value = value;
}
}
}
observer.js
到1:36
class Observer {
constructor(data) {
this.observe(data)
}
observe(data) {
if (!data || typeof data !== 'object') {
return;
}
Object.keys(data).forEach(key => {
this.defineReactive(data, key, data[key]);
this.observe(data[key])
})
}
defineReactive(obj, key, value) {
let that = this;
Object.defineProperty(obj, key, {
enumerable: true,
configurable: true,
get() {
return value;
},
set() {
if (newValue != value) {
that.observe(newValue)
value = newValue
}
}
})
}
}