常用的前端JavaScript方法封装

• 22、兼容getelementsbyclassname方法
• 25、封装自己的foreach方法
• 32、遍历dom树
• 41、requestanimframe兼容性方法
• 42、cancelanimframe兼容性方法

1、输入一个值，返回其数据类型**

function type(para) {
    return object.prototype.tostring.call(para)
}

2、数组去重

function unique1(arr) {
    return [...new set(arr)]
}

function unique2(arr) {
    var obj = {};
    return arr.filter(ele => {
        if (!obj[ele]) {
            obj[ele] = true;
            return true;
        }
    })
}

function unique3(arr) {
    var result = [];
    arr.foreach(ele => {
        if (result.indexof(ele) == -1) {
            result.push(ele)
        }
    })
    return result;
}

3、字符串去重

string.prototype.unique = function () {
    var obj = {},
        str = '',
        len = this.length;
    for (var i = 0; i < len; i++) {
        if (!obj[this[i]]) {
            str += this[i];
            obj[this[i]] = true;
        }
    }
    return str;
}

###### //去除连续的字符串 
function uniq(str) {
    return str.replace(/(\w)\1+/g, '$1')
}

4、深拷贝 浅拷贝

//深克隆（深克隆不考虑函数）
function deepclone(obj, result) {
    var result = result || {};
    for (var prop in obj) {
        if (obj.hasownproperty(prop)) {
            if (typeof obj[prop] == 'object' && obj[prop] !== null) {
                // 引用值(obj/array)且不为null
                if (object.prototype.tostring.call(obj[prop]) == '[object object]') {
                    // 对象
                    result[prop] = {};
                } else {
                    // 数组
                    result[prop] = [];
                }
                deepclone(obj[prop], result[prop])
    } else {
        // 原始值或func
        result[prop] = obj[prop]
    }
  }
}
return result;
}

// 深浅克隆是针对引用值
function deepclone(target) {
    if (typeof (target) !== 'object') {
        return target;
    }
    var result;
    if (object.prototype.tostring.call(target) == '[object array]') {
        // 数组
        result = []
    } else {
        // 对象
        result = {};
    }
    for (var prop in target) {
        if (target.hasownproperty(prop)) {
            result[prop] = deepclone(target[prop])
        }
    }
    return result;
}
// 无法复制函数
var o1 = json.parse(json.stringify(obj1));

5、reverse底层原理和扩展

// 改变原数组
array.prototype.myreverse = function () {
    var len = this.length;
    for (var i = 0; i < len; i++) {
        var temp = this[i];
        this[i] = this[len - 1 - i];
        this[len - 1 - i] = temp;
    }
    return this;
}

6、圣杯模式的继承

function inherit(target, origin) {
    function f() {};
    f.prototype = origin.prototype;
    target.prototype = new f();
    target.prototype.constructor = target;
    // 最终的原型指向
    target.prop.uber = origin.prototype;
}

7、找出字符串中第一次只出现一次的字母

string.prototype.firstappear = function () {
    var obj = {},
        len = this.length;
    for (var i = 0; i < len; i++) {
        if (obj[this[i]]) {
            obj[this[i]]++;
        } else {
            obj[this[i]] = 1;
        }
    }
    for (var prop in obj) {
       if (obj[prop] == 1) {
         return prop;
       }
    }
}

8、找元素的第n级父元素

function parents(ele, n) {
    while (ele && n) {
        ele = ele.parentelement ? ele.parentelement : ele.parentnode;
        n--;
    }
    return ele;
}

9、 返回元素的第n个兄弟节点

function retsibling(e, n) {
    while (e && n) {
        if (n > 0) {
            if (e.nextelementsibling) {
                e = e.nextelementsibling;
            } else {
                for (e = e.nextsibling; e && e.nodetype !== 1; e = e.nextsibling);
            }
            n--;
        } else {
            if (e.previouselementsibling) {
                e = e.previouselementsibling;
            } else {
                for (e = e.previouselementsibling; e && e.nodetype !== 1; e = e.previouselementsibling);
            }
            n++;
        }
    }
    return e;
}

10、封装mychildren，解决浏览器的兼容问题

function mychildren(e) {
    var children = e.childnodes,
        arr = [],
        len = children.length;
    for (var i = 0; i < len; i++) {
        if (children[i].nodetype === 1) {
            arr.push(children[i])
        }
    }
    return arr;
}

11、判断元素有没有子元素

function haschildren(e) {
    var children = e.childnodes,
        len = children.length;
    for (var i = 0; i < len; i++) {
        if (children[i].nodetype === 1) {
            return true;
        }
    }
    return false;
}

12、我一个元素插入到另一个元素的后面

element.prototype.insertafter = function (target, elen) {
    var nextelen = elen.nextelenmentsibling;
    if (nextelen == null) {
        this.appendchild(target);
    } else {
        this.insertbefore(target, nextelen);
    }
}

13、返回当前的时间（年月日时分秒）

function getdatetime() {
    var date = new date(),
        year = date.getfullyear(),
        month = date.getmonth() + 1,
        day = date.getdate(),
        hour = date.gethours() + 1,
        minute = date.getminutes(),
        second = date.getseconds();
        month = checktime(month);
        day = checktime(day);
        hour = checktime(hour);
        minute = checktime(minute);
        second = checktime(second);
     function checktime(i) {
        if (i < 10) {
                i = "0" + i;
       }
      return i;
    }
    return "" + year + "年" + month + "月" + day + "日" + hour + "时" + minute + "分" + second + "秒"
}

14、获得滚动条的滚动距离

function getscrolloffset() {
if (window.pagexoffset) {
return {
x: window.pagexoffset,
y: window.pageyoffset
}
} else {
return {
x: document.body.scrollleft + document.documentelement.scrollleft,
y: document.body.scrolltop + document.documentelement.scrolltop
}
}
}

15、获得视口的尺寸

function getviewportoffset() {
    if (window.innerwidth) {
        return {
            w: window.innerwidth,
            h: window.innerheight
        }
    } else {
        // ie8及其以下
        if (document.compatmode === "backcompat") {
            // 怪异模式
            return {
                w: document.body.clientwidth,
                h: document.body.clientheight
            }
        } else {
            // 标准模式
            return {
                w: document.documentelement.clientwidth,
                h: document.documentelement.clientheight
            }
        }
    }
}

16、获取任一元素的任意属性

function getstyle(elem, prop) {
    return window.getcomputedstyle ? window.getcomputedstyle(elem, null)[prop] : elem.currentstyle[prop]
}

17、绑定事件的兼容代码

function addevent(elem, type, handle) {
    if (elem.addeventlistener) { //非ie和非ie9
        elem.addeventlistener(type, handle, false);
    } else if (elem.attachevent) { //ie6到ie8
        elem.attachevent('on' + type, function () {
            handle.call(elem);
        })
    } else {
        elem['on' + type] = handle;
    }
}

18、解绑事件

function removeevent(elem, type, handle) {
    if (elem.removeeventlistener) { //非ie和非ie9
        elem.removeeventlistener(type, handle, false);
    } else if (elem.detachevent) { //ie6到ie8
        elem.detachevent('on' + type, handle);
    } else {
        elem['on' + type] = null;
    }
}

19、取消冒泡的兼容代码

function stopbubble(e) {
    if (e && e.stoppropagation) {
        e.stoppropagation();
    } else {
        window.event.cancelbubble = true;
    }
}

20、检验字符串是否是回文

function ispalina(str) {
    if (object.prototype.tostring.call(str) !== '[object string]') {
        return false;
    }
    var len = str.length;
    for (var i = 0; i < len / 2; i++) {
        if (str[i] != str[len - 1 - i]) {
            return false;
        }
    }
    return true;
}

21、检验字符串是否是回文

function ispalindrome(str) {
    str = str.replace(/\w/g, '').tolowercase();
    console.log(str)
    return (str == str.split('').reverse().join(''))
}

22、兼容getelementsbyclassname方法

element.prototype.getelementsbyclassname = document.prototype.getelementsbyclassname = function (_classname) {
    var alldomarray = document.getelementsbytagname('*');
    var lastdomarray = [];
    function trimspace(strclass) {
        var reg = /\s+/g;
        return strclass.replace(reg, ' ').trim()
    }
    for (var i = 0; i < alldomarray.length; i++) {
        var classarray = trimspace(alldomarray[i].classname).split(' ');
        for (var j = 0; j < classarray.length; j++) {
            if (classarray[j] == _classname) {
                lastdomarray.push(alldomarray[i]);
                break;
            }
        }
    }
    return lastdomarray;
}

23、运动函数

function animate(obj, json, callback) {
    clearinterval(obj.timer);
    var speed,
        current;
    obj.timer = setinterval(function () {
        var lock = true;
        for (var prop in json) {
            if (prop == 'opacity') {
                current = parsefloat(window.getcomputedstyle(obj, null)[prop]) * 100;
            } else {
                current = parseint(window.getcomputedstyle(obj, null)[prop]);
            }
            speed = (json[prop] - current) / 7;
            speed = speed > 0 ? math.ceil(speed) : math.floor(speed);

            if (prop == 'opacity') {
                obj.style[prop] = (current + speed) / 100;
            } else {
                obj.style[prop] = current + speed + 'px';
            }
            if (current != json[prop]) {
                lock = false;
            }
        }
        if (lock) {
            clearinterval(obj.timer);
            typeof callback == 'function' ? callback() : '';
        }
    }, 30)
}

24、弹性运动

function elasticmovement(obj, target) {
    clearinterval(obj.timer);
    var ispeed = 40,
        a, u = 0.8;
    obj.timer = setinterval(function () {
        a = (target - obj.offsetleft) / 8;
        ispeed = ispeed + a;
        ispeed = ispeed * u;
        if (math.abs(ispeed) <= 1 && math.abs(a) <= 1) {
            console.log('over')
            clearinterval(obj.timer);
            obj.style.left = target + 'px';
        } else {
            obj.style.left = obj.offsetleft + ispeed + 'px';
        }
    }, 30);
}

25、封装自己的foreach方法

array.prototype.myforeach = function (func, obj) {
    var len = this.length;
    var _this = arguments[1] ? arguments[1] : window;
    // var _this=arguments[1]||window;
    for (var i = 0; i < len; i++) {
        func.call(_this, this[i], i, this)
    }
}

26、封装自己的filter方法

array.prototype.myfilter = function (func, obj) {
    var len = this.length;
    var arr = [];
    var _this = arguments[1] || window;
    for (var i = 0; i < len; i++) {
        func.call(_this, this[i], i, this) && arr.push(this[i]);
    }
    return arr;
}

27、数组map方法

array.prototype.mymap = function (func) {
    var arr = [];
    var len = this.length;
    var _this = arguments[1] || window;
    for (var i = 0; i < len; i++) {
        arr.push(func.call(_this, this[i], i, this));
    }
    return arr;
}

28、数组every方法

array.prototype.myevery = function (func) {
    var flag = true;
    var len = this.length;
    var _this = arguments[1] || window;
    for (var i = 0; i < len; i++) {
        if (func.apply(_this, [this[i], i, this]) == false) {
            flag = false;
            break;
        }
    }
    return flag;
}

29、数组reduce方法

array.prototype.myreduce = function (func, initialvalue) {
    var len = this.length,
        nextvalue,
        i;
    if (!initialvalue) {
        // 没有传第二个参数
        nextvalue = this[0];
        i = 1;
    } else {
        // 传了第二个参数
        nextvalue = initialvalue;
        i = 0;
    }
    for (; i < len; i++) {
        nextvalue = func(nextvalue, this[i], i, this);
    }
    return nextvalue;
}

30、获取url中的参数

function getwindonhref() {
    var shref = window.location.href;
    var args = shref.split('?');
    if (args[0] === shref) {
        return '';
    }
    var hrefarr = args[1].split('#')[0].split('&');
    var obj = {};
    for (var i = 0; i < hrefarr.length; i++) {
        hrefarr[i] = hrefarr[i].split('=');
        obj[hrefarr[i][0]] = hrefarr[i][1];
    }
    return obj;
}

31、数组排序

// 快排 [left] + min + [right]
function quickarr(arr) {
    if (arr.length <= 1) {
        return arr;
    }
    var left = [],
        right = [];
    var pindex = math.floor(arr.length / 2);
    var p = arr.splice(pindex, 1)[0];
    for (var i = 0; i < arr.length; i++) {
        if (arr[i] <= p) {
            left.push(arr[i]);
        } else {
            right.push(arr[i]);
        }
    }
    // 递归
    return quickarr(left).concat([p], quickarr(right));
}

// 冒泡
function bubblesort(arr) {
    for (var i = 0; i < arr.length - 1; i++) {
        for (var j = i + 1; j < arr.length; j++) {
            if (arr[i] > arr[j]) {
                var temp = arr[i];
                arr[i] = arr[j];
                arr[j] = temp;
            }
        }
    }
    return arr;
}

function bubblesort(arr) {
    var len = arr.length;
    for (var i = 0; i < len - 1; i++) {
        for (var j = 0; j < len - 1 - i; j++) {
            if (arr[j] > arr[j + 1]) {
                var temp = arr[j];
                arr[j] = arr[j + 1];
                arr[j + 1] = temp;
            }
        }
    }
    return arr;
}

32、遍历dom树

 给定页面上的dom元素,将访问元素本身及其所有后代(不仅仅是它的直接子元素)
对于每个访问的元素，函数讲元素传递给提供的回调函数

function traverse(element, callback) {
    callback(element);
    var list = element.children;
    for (var i = 0; i < list.length; i++) {
        traverse(list[i], callback);
    }
}

33、原生js封装ajax

function ajax(method, url, callback, data, flag) {
    var xhr;
    flag = flag || true;
    method = method.touppercase();
    if (window.xmlhttprequest) {
        xhr = new xmlhttprequest();
    } else {
        xhr = new activexobject('microsoft.xmlhttp');
    }
    xhr.onreadystatechange = function () {
        if (xhr.readystate == 4 && xhr.status == 200) {
            console.log(2)
            callback(xhr.responsetext);
        }
    }

    if (method == 'get') {
        var date = new date(),
        timer = date.gettime();
        xhr.open('get', url + '?' + data + '&timer' + timer, flag);
        xhr.send()
        } else if (method == 'post') {
        xhr.open('post', url, flag);
        xhr.setrequestheader('content-type', 'application/x-www-form-urlencoded');
        xhr.send(data);
    }
}

34、异步加载script

function loadscript(url, callback) {
    var oscript = document.createelement('script');
    if (oscript.readystate) { // ie8及以下版本
        oscript.onreadystatechange = function () {
            if (oscript.readystate === 'complete' || oscript.readystate === 'loaded') {
                callback();
            }
        }
    } else {
        oscript.onload = function () {
            callback()
        };
    }
    oscript.src = url;
    document.body.appendchild(oscript);
}

35、cookie管理

var cookie = {
    set: function (name, value, time) {
        document.cookie = name + '=' + value + '; max-age=' + time;
        return this;
    },
    remove: function (name) {
        return this.setcookie(name, '', -1);
    },
    get: function (name, callback) {
        var allcookiearr = document.cookie.split('; ');
        for (var i = 0; i < allcookiearr.length; i++) {
            var itemcookiearr = allcookiearr[i].split('=');
            if (itemcookiearr[0] === name) {
                return itemcookiearr[1]
            }
        }
        return undefined;
    }
}

36、实现bind()方法

function.prototype.mybind = function (target) {
    var target = target || window;
    var _args1 = [].slice.call(arguments, 1);
    var self = this;
    var temp = function () {};
    var f = function () {
        var _args2 = [].slice.call(arguments, 0);
        var parasarr = _args1.concat(_args2);
        return self.apply(this instanceof temp ? this : target, parasarr)
    }
    temp.prototype = self.prototype;
    f.prototype = new temp();
    return f;
}

37、实现call()方法

function.prototype.mycall = function () {
    var ctx = arguments[0] || window;
    ctx.fn = this;
    var args = [];
    for (var i = 1; i < arguments.length; i++) {
        args.push(arguments[i])
    }
    var result = ctx.fn(...args);
    delete ctx.fn;
    return result;
}

38、实现apply()方法

function.prototype.myapply = function () {
    var ctx = arguments[0] || window;
    ctx.fn = this;
    if (!arguments[1]) {
        var result = ctx.fn();
        delete ctx.fn;
        return result;
    }
    var result = ctx.fn(...arguments[1]);
    delete ctx.fn;
    return result;
}

39、防抖

function debounce(handle, delay) {
    var timer = null;
    return function () {
        var _self = this,
            _args = arguments;
        cleartimeout(timer);
        timer = settimeout(function () {
            handle.apply(_self, _args)
        }, delay)
    }
}

40、节流

function throttle(handler, wait) {
    var lasttime = 0;
    return function (e) {
        var nowtime = new date().gettime();
        if (nowtime - lasttime > wait) {
            handler.apply(this, arguments);
            lasttime = nowtime;
        }
    }
}

41、requestanimframe兼容性方法

window.requestanimframe = (function () {
    return window.requestanimationframe ||
        window.webkitrequestanimationframe ||
        window.mozrequestanimationframe ||
        function (callback) {
            window.settimeout(callback, 1000 / 60);
        };
})();

42、cancelanimframe兼容性方法

window.cancelanimframe = (function () {
    return window.cancelanimationframe ||
        window.webkitcancelanimationframe ||
        window.mozcancelanimationframe ||
        function (id) {
            window.cleartimeout(id);
        };
})();

43、jsonp底层方法

function jsonp(url, callback) {
    var oscript = document.createelement('script');
    if (oscript.readystate) { // ie8及以下版本
        oscript.onreadystatechange = function () {
            if (oscript.readystate === 'complete' || oscript.readystate === 'loaded') {
                callback();
            }
        }
    } else {
        oscript.onload = function () {
            callback()
        };
    }
    oscript.src = url;
    document.body.appendchild(oscript);
}

44、获取url上的参数

function geturlparam(surl, skey) {
    var result = {};
    surl.replace(/(\w+)=(\w+)(?=[&|#])/g, function (ele, key, val) {
        if (!result[key]) {
            result[key] = val;
        } else {
            var temp = result[key];
            result[key] = [].concat(temp, val);
        }
    })
    if (!skey) {
        return result;
    } else {
        return result[skey] || '';
    }
}

45、格式化时间

function formatdate(t, str) {
    var obj = {
        yyyy: t.getfullyear(),
        yy: ("" + t.getfullyear()).slice(-2),
        m: t.getmonth() + 1,
        mm: ("0" + (t.getmonth() + 1)).slice(-2),
        d: t.getdate(),
        dd: ("0" + t.getdate()).slice(-2),
        h: t.gethours(),
        hh: ("0" + t.gethours()).slice(-2),
        h: t.gethours() % 12,
        hh: ("0" + t.gethours() % 12).slice(-2),
        m: t.getminutes(),
        mm: ("0" + t.getminutes()).slice(-2),
        s: t.getseconds(),
        ss: ("0" + t.getseconds()).slice(-2),
        w: ['日', '一', '二', '三', '四', '五', '六'][t.getday()]
    };
    return str.replace(/([a-z]+)/ig, function ($1) {
        return obj[$1]
    });
}

46、验证邮箱的正则表达式

function isavailableemail(semail) {
    var reg = /^([\w+\.])+@\w+([.]\w+)+$/
    return reg.test(semail)
}

47、函数柯里化

是把接受多个参数的函数变换成接受一个单一参数(最初函数的第一个参数)的函数，并且返回接受余下的参数且返回结果的新函数的技术

function curryit(fn) {
    var length = fn.length,
        args = [];
    var result = function (arg) {
        args.push(arg);
        length--;
        if (length <= 0) {
            return fn.apply(this, args);
        } else {
            return result;
        }
    }
    return result;
}

48、大数相加

function sumbignumber(a, b) {
    var res = '', //结果
        temp = 0; //按位加的结果及进位
    a = a.split('');
    b = b.split('');
    while (a.length || b.length || temp) {
        //~~按位非 1.类型转换，转换成数字 2.~~undefined==0 
        temp += ~~a.pop() + ~~b.pop();
        res = (temp % 10) + res;
        temp = temp > 9;
    }
    return res.replace(/^0+/, '');
}

49、单例模式

function getsingle(func) {
    var result;
    return function () {
        if (!result) {
            result = new func(arguments);
        }
        return result;
    }
}

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