项目中常用的js方法封装

1获取url的参数并且封装为对象形式

function getUrl() {
    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;
}

2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;
}

3遍历DOM

// 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);
    }
}

4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);
}

5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;
}

6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;
}

7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;
}

8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)
    }
}

9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;
        }
    }
}

10jsonp方法封装

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);
}

11数组去重方法

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;
}

12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));

13时间戳年月日的转换

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"
}