JavaScript常用方法封装

1.type 类型判断

isString (o) { //是否字符串
    return Object.prototype.toString.call(o).slice(8, -1) === 'String'
}

isNumber (o) { //是否数字
    return Object.prototype.toString.call(o).slice(8, -1) === 'Number'
}

isBoolean (o) { //是否boolean
    return Object.prototype.toString.call(o).slice(8, -1) === 'Boolean'
}

isFunction (o) { //是否函数
    return Object.prototype.toString.call(o).slice(8, -1) === 'Function'
}

isNull (o) { //是否为null
    return Object.prototype.toString.call(o).slice(8, -1) === 'Null'
}

isUndefined (o) { //是否undefined
    return Object.prototype.toString.call(o).slice(8, -1) === 'Undefined'
}

isObj (o) { //是否对象
    return Object.prototype.toString.call(o).slice(8, -1) === 'Object'
}

isArray (o) { //是否数组
    return Object.prototype.toString.call(o).slice(8, -1) === 'Array'
}

isDate (o) { //是否时间
    return Object.prototype.toString.call(o).slice(8, -1) === 'Date'
}

isRegExp (o) { //是否正则
    return Object.prototype.toString.call(o).slice(8, -1) === 'RegExp'
}

isError (o) { //是否错误对象
    return Object.prototype.toString.call(o).slice(8, -1) === 'Error'
}

isSymbol (o) { //是否Symbol函数
    return Object.prototype.toString.call(o).slice(8, -1) === 'Symbol'
}

isPromise (o) { //是否Promise对象
    return Object.prototype.toString.call(o).slice(8, -1) === 'Promise'
}

isSet (o) { //是否Set对象
    return Object.prototype.toString.call(o).slice(8, -1) === 'Set'
}

isFalse (o) {
    if (!o || o === 'null' || o === 'undefined' || o === 'false' || o === 'NaN') return true
        return false
}

isTrue (o) {
    return !this.isFalse(o)
}

isIos () {
    var u = navigator.userAgent;
    if (u.indexOf('Android') > -1 || u.indexOf('Linux') > -1) {//安卓手机
        // return "Android";
        return false
    } else if (u.indexOf('iPhone') > -1) {//苹果手机
        // return "iPhone";
        return true
    } else if (u.indexOf('iPad') > -1) {//iPad
        // return "iPad";
        return false
    } else if (u.indexOf('Windows Phone') > -1) {//winphone手机
        // return "Windows Phone";
        return false
    }else{
        return false
    }
}

isPC () { //是否为PC端
    var userAgentInfo = navigator.userAgent;
    var Agents = ["Android", "iPhone",
                "SymbianOS", "Windows Phone",
                "iPad", "iPod"];
    var flag = true;
    for (var v = 0; v < Agents.length; v++) {
        if (userAgentInfo.indexOf(Agents[v]) > 0) {
            flag = false;
            break;
        }
    }
    return flag;
}

browserType(){
    var userAgent = navigator.userAgent; //取得浏览器的userAgent字符串
    var isOpera = userAgent.indexOf("Opera") > -1; //判断是否Opera浏览器
    var isIE = userAgent.indexOf("compatible") > -1 && userAgent.indexOf("MSIE") > -1 && !isOpera; //判断是否IE浏览器
    var isIE11 = userAgent.indexOf('Trident') > -1 && userAgent.indexOf("rv:11.0") > -1;
    var isEdge = userAgent.indexOf("Edge") > -1 && !isIE; //判断是否IE的Edge浏览器  
    var isFF = userAgent.indexOf("Firefox") > -1; //判断是否Firefox浏览器
    var isSafari = userAgent.indexOf("Safari") > -1 && userAgent.indexOf("Chrome") == -1; //判断是否Safari浏览器
    var isChrome = userAgent.indexOf("Chrome") > -1 && userAgent.indexOf("Safari") > -1; //判断Chrome浏览器

    if (isIE) {
        var reIE = new RegExp("MSIE (\\d+\\.\\d+);");
        reIE.test(userAgent);
        var fIEVersion = parseFloat(RegExp["$1"]);
        if(fIEVersion == 7) return "IE7"
        else if(fIEVersion == 8) return "IE8";
        else if(fIEVersion == 9) return "IE9";
        else if(fIEVersion == 10) return "IE10";
        else return "IE7以下"//IE版本过低
    }
    if (isIE11) return 'IE11';
    if (isEdge) return "Edge";
    if (isFF) return "FF";
    if (isOpera) return "Opera";
    if (isSafari) return "Safari";
    if (isChrome) return "Chrome";
}

checkStr (str, type) {
    switch (type) {
        case 'phone':   //手机号码
            return /^1[3|4|5|6|7|8|9][0-9]{9}$/.test(str);
        case 'tel':     //座机
            return /^(0\d{2,3}-\d{7,8})(-\d{1,4})?$/.test(str);
        case 'card':    //身份证
            return /(^\d{15}$)|(^\d{18}$)|(^\d{17}(\d|X|x)$)/.test(str);
        case 'pwd':     //密码以字母开头,长度在6~18之间,只能包含字母、数字和下划线
            return /^[a-zA-Z]\w{5,17}$/.test(str)
        case 'postal':  //邮政编码
            return /[1-9]\d{5}(?!\d)/.test(str);
        case 'QQ':      //QQ号
            return /^[1-9][0-9]{4,9}$/.test(str);
        case 'email':   //邮箱
            return /^[\w-]+(\.[\w-]+)*@[\w-]+(\.[\w-]+)+$/.test(str);
        case 'money':   //金额(小数点2位)
            return /^\d*(?:\.\d{0,2})?$/.test(str);
        case 'URL':     //网址
            return /(http|ftp|https):\/\/[\w\-_]+(\.[\w\-_]+)+([\w\-\.,@?^=%&:/~\+#]*[\w\-\@?^=%&/~\+#])?/.test(str)
        case 'IP':      //IP
            return /((?:(?:25[0-5]|2[0-4]\\d|[01]?\\d?\\d)\\.){3}(?:25[0-5]|2[0-4]\\d|[01]?\\d?\\d))/.test(str);
        case 'date':    //日期时间
            return /^(\d{4})\-(\d{2})\-(\d{2}) (\d{2})(?:\:\d{2}|:(\d{2}):(\d{2}))$/.test(str) || /^(\d{4})\-(\d{2})\-(\d{2})$/.test(str)
        case 'number':  //数字
            return /^[0-9]$/.test(str);
        case 'english': //英文
            return /^[a-zA-Z]+$/.test(str);
        case 'chinese': //中文
            return /^[\u4E00-\u9FA5]+$/.test(str);
        case 'lower':   //小写
            return /^[a-z]+$/.test(str);
        case 'upper':   //大写
            return /^[A-Z]+$/.test(str);
        case 'HTML':    //HTML标记
            return /<("[^"]*"|'[^']*'|[^'">])*>/.test(str);
        default:
            return true;
    }

    // 严格的身份证校验
    isCardID(sId) {
        if (!/(^\d{15}$)|(^\d{17}(\d|X|x)$)/.test(sId)) {
            alert('你输入的身份证长度或格式错误')
            return false
        }
        //身份证城市
        var aCity={11:"北京",12:"天津",13:"河北",14:"山西",15:"内蒙古",21:"辽宁",22:"吉林",23:"黑龙江",31:"上海",32:"江苏",33:"浙江",34:"安徽",35:"福建",36:"江西",37:"山东",41:"河南",42:"湖北",43:"湖南",44:"广东",45:"广西",46:"海南",50:"重庆",51:"四川",52:"贵州",53:"云南",54:"西藏",61:"陕西",62:"甘肃",63:"青海",64:"宁夏",65:"新疆",71:"台湾",81:"香港",82:"澳门",91:"国外"};
        if(!aCity[parseInt(sId.substr(0,2))]) { 
            alert('你的身份证地区非法')
            return false
        }

        // 出生日期验证
        var sBirthday=(sId.substr(6,4)+"-"+Number(sId.substr(10,2))+"-"+Number(sId.substr(12,2))).replace(/-/g,"/"),
            d = new Date(sBirthday)
        if(sBirthday != (d.getFullYear()+"/"+ (d.getMonth()+1) + "/" + d.getDate())) {
            alert('身份证上的出生日期非法')
            return false
        }

        // 身份证号码校验
        var sum = 0,
            weights =  [7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2],
            codes = "10X98765432"
        for (var i = 0; i < sId.length - 1; i++) {
            sum += sId[i] * weights[i];
        }
        var last = codes[sum % 11]; //计算出来的最后一位身份证号码
        if (sId[sId.length-1] != last) { 
            alert('你输入的身份证号非法')
            return false
        }

        return true
    }
}
  1. Date
/**
 * 格式化时间
 * 
 * @param  {time} 时间
 * @param  {cFormat} 格式
 * @return {String} 字符串
 *
 * @example formatTime('2018-1-29', '{y}/{m}/{d} {h}:{i}:{s}') // -> 2018/01/29 00:00:00
 */
formatTime(time, cFormat) {
    if (arguments.length === 0) return null
    if ((time + '').length === 10) {
        time = +time * 1000
    }

    var format = cFormat || '{y}-{m}-{d} {h}:{i}:{s}', date
    if (typeof time === 'object') {
        date = time
    } else {
        date = new Date(time)
    }

    var formatObj = {
        y: date.getFullYear(),
        m: date.getMonth() + 1,
        d: date.getDate(),
        h: date.getHours(),
        i: date.getMinutes(),
        s: date.getSeconds(),
        a: date.getDay()
    }
    var time_str = format.replace(/{(y|m|d|h|i|s|a)+}/g, (result, key) => {
        var value = formatObj[key]
        if (key === 'a') return ['一', '二', '三', '四', '五', '六', '日'][value - 1]
        if (result.length > 0 && value < 10) {
            value = '0' + value
        }
        return value || 0
    })
    return time_str
}

/**
 * 返回指定长度的月份集合
 * 
 * @param  {time} 时间
 * @param  {len} 长度
 * @param  {direction} 方向:  1: 前几个月;  2: 后几个月;  3:前后几个月  默认 3
 * @return {Array} 数组
 * 
 * @example   getMonths('2018-1-29', 6, 1)  // ->  ["2018-1", "2017-12", "2017-11", "2017-10", "2017-9", "2017-8", "2017-7"]
 */
getMonths(time, len, direction) {
    var mm = new Date(time).getMonth(),
        yy = new Date(time).getFullYear(),
        direction = isNaN(direction) ? 3 : direction,
        index = mm;
    var cutMonth = function(index) {
        if ( index <= len && index >= -len) {
            return direction === 1 ? formatPre(index).concat(cutMonth(++index)):
                direction === 2 ? formatNext(index).concat(cutMonth(++index)):formatCurr(index).concat(cutMonth(++index))
        }
        return []
    }
    var formatNext = function(i) {
        var y = Math.floor(i/12),
            m = i%12
        return [yy+y + '-' + (m+1)]
    }
    var formatPre = function(i) {
        var y = Math.ceil(i/12),
            m = i%12
        m = m===0 ? 12 : m
        return [yy-y + '-' + (13 - m)]
    }
    var formatCurr = function(i) {
        var y = Math.floor(i/12),
            yNext = Math.ceil(i/12),
            m = i%12,
            mNext = m===0 ? 12 : m
        return [yy-yNext + '-' + (13 - mNext),yy+y + '-' + (m+1)]
    }
    // 数组去重
    var unique = function(arr) {
        if ( Array.hasOwnProperty('from') ) {
            return Array.from(new Set(arr));
        }else{
            var n = {},r=[]; 
            for(var i = 0; i < arr.length; i++){
                if (!n[arr[i]]){
                    n[arr[i]] = true; 
                    r.push(arr[i]);
                }
            }
            return r;
        }
    }
    return direction !== 3 ? cutMonth(index) : unique(cutMonth(index).sort(function(t1, t2){
        return new Date(t1).getTime() - new Date(t2).getTime()
    }))
}

/**
 * 返回指定长度的天数集合
 * 
 * @param  {time} 时间
 * @param  {len} 长度
 * @param  {direction} 方向: 1: 前几天;  2: 后几天;  3:前后几天  默认 3
 * @return {Array} 数组
 *
 * @example date.getDays('2018-1-29', 6) // -> ["2018-1-26", "2018-1-27", "2018-1-28", "2018-1-29", "2018-1-30", "2018-1-31", "2018-2-1"]
 */
getDays(time, len, diretion) {
    var tt = new Date(time)
    var getDay = function(day) {
        var t = new Date(time)
        t.setDate(t.getDate() + day)
        var m = t.getMonth()+1
        return t.getFullYear()+'-'+m+'-'+t.getDate()
    }
    var arr = []
    if (diretion === 1) {
        for (var i = 1; i <= len; i++) {
            arr.unshift(getDay(-i))
        }
    }else if(diretion === 2) {
        for (var i = 1; i <= len; i++) {
            arr.push(getDay(i))
        }
    }else {
        for (var i = 1; i <= len; i++) {
            arr.unshift(getDay(-i))
        }
        arr.push(tt.getFullYear()+'-'+(tt.getMonth()+1)+'-'+tt.getDate())
        for (var i = 1; i <= len; i++) {
            arr.push(getDay(i))
        }
    }
    return diretion === 1 ? arr.concat([tt.getFullYear()+'-'+(tt.getMonth()+1)+'-'+tt.getDate()]) : 
        diretion === 2 ? [tt.getFullYear()+'-'+(tt.getMonth()+1)+'-'+tt.getDate()].concat(arr) : arr
}

/**
 * @param  {s} 秒数
 * @return {String} 字符串 
 *
 * @example formatHMS(3610) // -> 1h0m10s
 */
formatHMS (s) {
    var str = ''
    if (s > 3600) {
        str = Math.floor(s/3600)+'h'+Math.floor(s%3600/60)+'m'+s%60+'s'
    }else if(s > 60) {
        str = Math.floor(s/60)+'m'+s%60+'s'
    }else{
        str = s%60+'s'
    }
    return str
}

/*获取某月有多少天*/
getMonthOfDay (time) {
    var date = new Date(time)
    var year = date.getFullYear()
    var mouth = date.getMonth() + 1
    var days

    //当月份为二月时,根据闰年还是非闰年判断天数
    if (mouth == 2) {
        days = (year%4==0 && year%100==0 && year%400==0) || (year%4==0 && year%100!=0) ? 28 : 29
    } else if (mouth == 1 || mouth == 3 || mouth == 5 || mouth == 7 || mouth == 8 || mouth == 10 || mouth == 12) {
        //月份为:1,3,5,7,8,10,12 时,为大月.则天数为31;
        days = 31
    } else {
        //其他月份,天数为:30.
        days = 30
    }
    return days
}

/*获取某年有多少天*/
getYearOfDay (time) {
    var firstDayYear = this.getFirstDayOfYear(time);
    var lastDayYear = this.getLastDayOfYear(time);
    var numSecond = (new Date(lastDayYear).getTime() - new Date(firstDayYear).getTime())/1000;
    return Math.ceil(numSecond/(24*3600));
}

/*获取某年的第一天*/
getFirstDayOfYear (time) {
    var year = new Date(time).getFullYear();
    return year + "-01-01 00:00:00";
}

/*获取某年最后一天*/
getLastDayOfYear (time) {
    var year = new Date(time).getFullYear();
    var dateString = year + "-12-01 00:00:00";
    var endDay = this.getMonthOfDay(dateString);
    return year + "-12-" + endDay + " 23:59:59";
}

/*获取某个日期是当年中的第几天*/
getDayOfYear (time) {
    var firstDayYear = this.getFirstDayOfYear(time);
    var numSecond = (new Date(time).getTime() - new Date(firstDayYear).getTime())/1000;
    return Math.ceil(numSecond/(24*3600));
}

/*获取某个日期在这一年的第几周*/
getDayOfYearWeek (time) {
    var numdays = this.getDayOfYear(time);
    return Math.ceil(numdays / 7);
}

3.Array

/*判断一个元素是否在数组中*/
contains (arr, val) {
    return arr.indexOf(val) != -1 ? true : false;
}

/**
 * @param  {arr} 数组
 * @param  {fn} 回调函数
 * @return {undefined}
 */
each (arr, fn) {
    fn = fn || Function;
    var a = [];
    var args = Array.prototype.slice.call(arguments, 1);
    for(var i = 0; i < arr.length; i++) {
        var res = fn.apply(arr, [arr[i], i].concat(args));
        if(res != null) a.push(res);
    }
}

/**
 * @param  {arr} 数组
 * @param  {fn} 回调函数
 * @param  {thisObj} this指向
 * @return {Array} 
 */
map (arr, fn, thisObj) {
    var scope = thisObj || window;
    var a = [];
    for(var i = 0, j = arr.length; i < j; ++i) {
        var res = fn.call(scope, arr[i], i, this);
        if(res != null) a.push(res);
    }
    return a;
}

/**
 * @param  {arr} 数组
 * @param  {type} 1:从小到大   2:从大到小   3:随机
 * @return {Array}
 */
sort (arr, type = 1) {
    return arr.sort( (a, b) => {
        switch(type) {
            case 1:
                return a - b;
            case 2:
                return b - a;
            case 3:
                return Math.random() - 0.5;
            default:
                return arr;
        }
    })
}

/*去重*/
unique (arr) {
    if ( Array.hasOwnProperty('from') ) {
        return Array.from(new Set(arr));
    }else{
        var n = {},r=[]; 
        for(var i = 0; i < arr.length; i++){
            if (!n[arr[i]]){
                n[arr[i]] = true; 
                r.push(arr[i]);
            }
        }
        return r;
    }
    // 注:上面 else 里面的排重并不能区分 2 和 '2',但能减少用indexOf带来的性能,暂时没找到替代的方法。。。
    /* 正确排重
    if ( Array.hasOwnProperty('from') ) {
        return Array.from(new Set(arr))
    }else{
        var r = [], NaNBol = true
        for(var i=0; i < arr.length; i++) {
            if (arr[i] !== arr[i]) {
                if (NaNBol && r.indexOf(arr[i]) === -1) {
                    r.push(arr[i])
                    NaNBol = false
                }
            }else{
                if(r.indexOf(arr[i]) === -1) r.push(arr[i])
            }
        }
        return r
    }

     */
}

/*求两个集合的并集*/
union (a, b) {
    var newArr = a.concat(b);
    return this.unique(newArr);
}

/*求两个集合的交集*/
intersect (a, b) {
    var _this = this;
    a = this.unique(a);
    return this.map(a, function(o) {
        return _this.contains(b, o) ? o : null;
    });
}

/*删除其中一个元素*/
remove (arr, ele) {
    var index = arr.indexOf(ele);
    if(index > -1) {
        arr.splice(index, 1);
    }
    return arr;
}

/*将类数组转换为数组的方法*/
formArray (ary) {
    var arr = [];
    if(Array.isArray(ary)) {
        arr = ary;
    } else {
        arr = Array.prototype.slice.call(ary);
    };
    return arr;
}

/*最大值*/
max (arr) {
    return Math.max.apply(null, arr);
}

/*最小值*/
min (arr) {
    return Math.min.apply(null, arr);
}

/*求和*/
sum (arr) {
    return arr.reduce( (pre, cur) => {
        return pre + cur
    })
}

/*平均值*/
average (arr) {
    return this.sum(arr)/arr.length
}

  1. String 字符串操作
/**
 * 去除空格
 * @param  {str}
 * @param  {type} 
 *       type:  1-所有空格  2-前后空格  3-前空格 4-后空格
 * @return {String}
 */
trim (str, type) {
    type = type || 1
    switch (type) {
        case 1:
            return str.replace(/\s+/g, "");
        case 2:
            return str.replace(/(^\s*)|(\s*$)/g, "");
        case 3:
            return str.replace(/(^\s*)/g, "");
        case 4:
            return str.replace(/(\s*$)/g, "");
        default:
            return str;
    }
}

/**
 * @param  {str} 
 * @param  {type}
 *       type:  1:首字母大写  2:首页母小写  3:大小写转换  4:全部大写  5:全部小写
 * @return {String}
 */
changeCase (str, type) {
    type = type || 4
    switch (type) {
        case 1:
            return str.replace(/\b\w+\b/g, function (word) {
                return word.substring(0, 1).toUpperCase() + word.substring(1).toLowerCase();

            });
        case 2:
            return str.replace(/\b\w+\b/g, function (word) {
                return word.substring(0, 1).toLowerCase() + word.substring(1).toUpperCase();
            });
        case 3:
            return str.split('').map( function(word){
                if (/[a-z]/.test(word)) {
                    return word.toUpperCase();
                }else{
                    return word.toLowerCase()
                }
            }).join('')
        case 4:
            return str.toUpperCase();
        case 5:
            return str.toLowerCase();
        default:
            return str;
    }
}

/*
    检测密码强度
*/
checkPwd (str) {
    var Lv = 0;
    if (str.length < 6) {
        return Lv
    }
    if (/[0-9]/.test(str)) {
        Lv++
    }
    if (/[a-z]/.test(str)) {
        Lv++
    }
    if (/[A-Z]/.test(str)) {
        Lv++
    }
    if (/[\.|-|_]/.test(str)) {
        Lv++
    }
    return Lv;
}

/*过滤html代码(把<>转换)*/
filterTag (str) {
    str = str.replace(/&/ig, "&");
    str = str.replace(//ig, ">");
    str = str.replace(" ", " ");
    return str;
}

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