简介：本文收集了我常用的JavaScript代码片段，欢迎提意见！

大灰狼边敲门边说：“小兔子乖乖，把门儿开开！”
小兔子听到后，连忙去开门：“来喽！”
兔妈妈对小兔子喊道：“不许开！是大灰狼！”
大灰狼在门口感叹道：“哎，骗一个女孩容易，骗一个女人难呀！”

JavaScript动态加载

//NO.1
functionloadScript(url, callback){var script = document.createElement ("script")script.type= "text/javascript";if (script.readyState){ //IEscript.onreadystatechange = function(){if (this.readyState == "loaded" || this.readyState == "complete"){this.onreadystatechange = null;callback();}};}else { //Othersscript.onload = function(){callback();};}script.src=url;document.getElementsByTagName("head")[0].appendChild(script);
}//NO.2
functionloadScript(url, callback){var xhr = newXMLHttpRequest();xhr.open("get", url, true);xhr.onreadystatechange= function(){if (xhr.readyState == 4){if (xhr.status >= 200 && xhr.status < 300 || xhr.status == 304){var script = document.createElement ("script");script.type= "text/javascript";script.text=xhr.responseText;document.body.appendChild(script);callback();}}};xhr.send(null);
}

DOM加载完执行

functiondomLoad(fn){if(document.addEventListener){document.addEventListener("DOMContentLoaded", fn, false);}else{if(window.ActiveXObject){document.write("<script id='ie_onload' defer src='javascript:void(0)'><\/script>");document.getElementById("ie_onload").onreadystatechange = function(){if(this.readyState == "complete"){this.onreadystatechange = null;fn();}}}if(/WebKit/i.test(navigator.userAgent)){var _timer = setInterval(function(){if(/loaded|complete/.test(document.readyState)){clearInterval(_timer);fn();}},10);}}
}

是否标准模式(IE)

function isCompatMode(){return document.compatMode == 'CSS1Compat';}

Link规则操作

//添加第一条规则//insertRule(sheet, 'body', 'background-color:red', 0);
functioninsertRule(sheet, selectorText, cssText, position) {if(sheet.insertRule) {sheet.insertRule(selectorText+ ' { ' + cssText + ' }', position);}else if(sheet.addRule) {sheet.addRule(selectorText, cssText, position);}
}//删除第一条规则//deleteRule(sheet, 0);
functiondeleteRule(sheet, position) {if(sheet.deleteRule) {sheet.deleteRule(position);}else if(sheet.removeRule) {sheet.removeRule(position);}
}

加载样式表

functionaddSheet(url){var oLink = document.createElement('link'),oHead = document.getElementsByTagName('head')[0];oLink.rel= 'stylesheet';oLink.type= 'text/css';oLink.href=url;oHead.appendChild(oLink);
}

获取CSS样式

functiongetStyle(o, attr){if(o.currentStyle){returno.currentStyle[attr];}else{return getComputedStyle(o,false)[attr];}
}

getByClass

functiongetElementsByClassName(classname, parent, nodename) {var parent = parent || document, nodename = nodename || "*";if(parent.getElementsByClassName){returnparent.getElementsByClassName(classname);}else{var l =parent.getElementsByTagName(nodename);return function() {var res =[];for (var i = 0, j = l.length; i < j; i++) {if(l[i].className){var name = " " + l[i].className + " ";if (name.indexOf(" " + classname + " ") != -1) {res.push(l[i]);}}}returnres;} ();}
}

hasClass

functionhasClass (element, className){return element.className.match(new RegExp('(\\s|^)'+ className +'(\\s|$)'));
}

addClass

functionaddClass(element, cName) {if (!hasClass(element, cName)) {element.className+= ' ' +cName;}
}

removeClass

functionremoveClass(element, cName) {if(hasClass(element, cName)) {element.className= element.className.replace(new RegExp('(\\s|^)' + cName + '(\\s|$)'), ' ');}
}

JSONP调用

<script src="http://www.xxx.com?name=fnCall"></script>
<script>
functionfnCall(info){//在前台提供一个方法fnCall的方法//http://www.xxx.com?name=fnCall 在(后台/其他页面)自动获取fnCall的名字并且执行
}</script>

获取服务器时间

functiongetNowDate(callback){var xhr = newXMLHttpRequest();xhr.open('get', 'null.txt', true); //null.txt不存在，我们不需要xhr.onreadystatechange = function(){if(xhr.readyState == 3){ //状态3响应callback(xhr.getResponseHeader('Date')); //返回时间，那么可以利用获得的时间做倒计时程序了。
}};xhr.send(null);
}

Cookie操作

functionCookie(name, value, options){if(typeof value != 'undefined'){options= options ||{};if(value === null){options.expires= -1; //过期
}var expires = '';//存在时间选项if(options.expires && (typeof options.expires == 'number' ||options.expires.toUTCString)){vardate;if(typeof options.expires == 'number'){date= newDate();date.setTime(date.getTime()+ (options.expires * 24 * 60 * 60 * 1000));}else{date=options.expires;}expires= '; expires='+date.toUTCString();}var path = options.path ? '; path='+options.path : '';var domain = options.domain ? '; domain='+options.domain : '';var secure = options.secure ? '; secure' : '';//写入cookiedocument.cookie = [name, '=', encodeURIComponent(value), expires, path, domain, secure].join('');}else{//读取cookievar cookValue = null;if(document.cookie && document.cookie != ''){var cookie = document.cookie.split(';');for(var i = 0, len = cookie.length; i < len; i++){var c = cookie[i].replace(/^\s+|\s+$/g, '');if(c.substring(0, name.length + 1) == (name + '=')){cookValue= decodeURIComponent(c.substring(name.length + 1));break;}}}returncookValue;}
}//设置
Cookie("user", "Jununx");//获取
Cookie("user");//删除
Cookie("user", null);

base64编码解码

functionb64Encode(str) {returnbtoa(unescape(encodeURIComponent(str)));
}functionb64Decode(str) {returndecodeURIComponent(escape(atob(str)));
}

浏览器判断

var browser = function() {var u =navigator.userAgent.toLowerCase();return{ version: (u.match(/.+(?:rv|it|ra|ie|chrome|micromessenger|version)[\/: ]([\d.]+)/) || [])[1],     safari:/safari/.test(u) && !/chrome/.test(u), opera:/opera/.test(u), msie:/msie|like gecko$/.test(u) && !/opera/.test(u), firefox:/firefox/.test(u) && !/(compatible|webkit)/.test(u),chrome:/chrome/.test(u) && /safari/.test(u),  mobile:!!/applewebkit.*mobile.*/.test(u),ios:!!/\(i[^;]+;( u;)? cpu.+mac os x/.test(u),android:/android|linux/.test(u), //android或uciPhone: /iphone/.test(u),iPad:/ipad/.test(u),weChat:/micromessenger/.test(u) //微信
};
};

IE版本判断

var _IE = (function(){var v = 3, div = document.createElement('div'), all = div.getElementsByTagName('i');while(div.innerHTML= '<!--[if gt IE ' + (++v) + ']><i></i><![endif]-->',all[0]);return v > 4 ? v : false;
}());

阶乘缓存

functionmemfactorial(n){if(!memfactorial.cache){memfactorial.cache={"0" : 1,"1" : 1};}if(!memfactorial.cache.hasOwnProperty(n)){memfactorial.cache[n]= n * memfactorial(n - 1);}returnmemfactorial.cache[n];
}

获取字符串长度

//NO.1
String.prototype.sLen = function(){var b = 0, l = this.length;if(l){for(var i = 0; i < l; i++){if(this.charCodeAt(i) > 255){b+= 2;}else{b++;}}returnb;}else{return 0;}
};//NO.2
String.prototype.sLen = function(){var b = 0, l = this.length;if(l){for(var i = 0; i < l; i++){var c = this.charAt(i);if(escape(c).length > 4){b+= 2;}else if(c != '\r'){b++;}}returnb;}else{return 0;}
};//NO.3
String.prototype.sLen = function(){var b = 0, l = this.length;if(l){for(var i = 0; i < l; i++){var c = this.charAt(i);if(/^[\u0000-\u00ff]$]/.test(c)){b++;}else if(c != '\r'){b+= 2;}}returnb;}else{return 0;}
};//NO.4
String.prototype.sLen = function(){var s = this.replace(/[^\x00-\xff]/g, "**");returns.length;
};

判断数据类型

var isType = function(obj, type){return Object.prototype.toString.call(obj) === '[object '+ type +']';
};

获取窗口位置

functionsereen(){return{left : window.screenLeft||window.scrollX,top : window.screenTop||window.scrollY};
}

获取可视窗口大小

functionclient(){//IE6不加dtd会进入怪癖模式，client需要通过document.body获取return{width : document.documentElement.clientWidth||document.body.clientWidth,height : document.documentElement.clientHeight||document.body.clientHeight};
}

获取scrollTop

functiongetScrollTop(){if(typeof pageYOffset!= 'undefined'){returnpageYOffset;}else{return (document.body ||document.documentElement).scrollTop;}
}

滚动到指定区域

el.scrollIntoView()

今天星期几

"今天是星期" + "天一二三四五六".charAt(new Date().getDay())

页面是否在iframe里

if(self==top){//not in iframe
}else{//in iframe
}

返回最小值~最大值之间随机数

functionrandom(min, max) {return Math.floor(Math.random() * (max - min + 1) +min);
}

数组去重

//NO.1
Array.prototype.unique = function() {for(var i=0, len = this.length; i<len; i++) {for(var j=i+1; j<len; j++) {if(this[i] === this[j])this.splice(j, 1);}}return this;
};//["a","a","b"].unique();//NO.2
Array.prototype.unique = function(){var that = this, temp = {}, result =[];for(var i = 0, len = that.length; i < len; i++) {if(!temp[typeof (that[i])+that[i]]){result.push(that[i]);temp[typeof(that[i])+that[i]] = '1';}}returnresult;
}//["a","a","b"].unique();

数组快排

functionquickSort(arr) {if (arr.length < 2) {returnarr;}var pivotIndex = Math.floor(arr.length / 2);var pivot = arr.splice(pivotIndex, 1)[0];var left =[];var right =[];for (var i = 0, j = arr.length; i < j; i++) {if (arr[i] <pivot) {left.push(arr[i]);}else{right.push(arr[i]);}}returnquickSort(left).concat([pivot], quickSort(right));
}var test = quickSort([1,9,2,8,3,7,4,6,5]);

将arguments转换成数组

var arr = Array.prototype.slice.call(arguments, 0);

数组随机排序

var arr = [1, 2, 3, 4, 5];
arr.sort(function(){return (Math.random() - 0.5);
});

获取数组中最小/大值

var max = Math.max.apply(null, array);var min = Math.min.apply(null, array);

数组index

functionindex(t, arr){if(arr.indexOf){returnarr.indexOf(t);}for(var i = arr.length ; i--; ){if(arr[i]===t){return i*1;}}return -1;
}

多维数组转一维数组

functionarr2ToArr(arr){return arr.toString().split(",");
}

选择数组中两数之和等于某值的情况 

//NO.1
var arr = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10], result = [], count = 10;for(var i = 0, len = arr.length; i < len; i ++){for(var j = i + 1; j < len; j ++){if(arr[i] + arr[j] ===count){result.push([arr[i], arr[j]]);}}
}//NO.2
var arr = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10], result = [], count = 10;for(var i = 0, len = Math.round(arr.length/2); i < len; i ++){if(arr.indexOf(count - arr[i]) !== -1){result.push([arr[i], count-arr[i]]);}
}

数字金额转换成大写

functiondigit_uppercase(n) {var fraction = ['角', '分'];var digit =['零', '壹', '贰', '叁', '肆','伍', '陆', '柒', '捌', '玖'];var unit =[['元', '万', '亿'],['', '拾', '佰', '仟']];var head = n < 0? '欠': '';n=Math.abs(n);var s = '';for (var i = 0; i < fraction.length; i++) {s+= (digit[Math.floor(n * 10 * Math.pow(10, i)) % 10] + fraction[i]).replace(/零./, '');}s= s || '整';n=Math.floor(n);for (var i = 0; i < unit[0].length && n > 0; i++) {var p = '';for (var j = 0; j < unit[1].length && n > 0; j++) {p= digit[n % 10] + unit[1][j] +p;n= Math.floor(n / 10);}s= p.replace(/(零.)*零$/, '').replace(/^$/, '零')+ unit[0][i] +s;}return head + s.replace(/(零.)*零元/, '元').replace(/(零.)+/g, '零').replace(/^整$/, '零元整');
}

日期格式化

Date.prototype.toString=function(format,loc){var time={};time.Year=this.getFullYear();time.TYear=(""+time.Year).substr(2);time.Month=this.getMonth()+1;time.TMonth=time.Month<10?"0"+time.Month:time.Month;time.Day=this.getDate();time.TDay=time.Day<10?"0"+time.Day:time.Day;time.Hour=this.getHours();time.THour=time.Hour<10?"0"+time.Hour:time.Hour;time.hour=time.Hour<13?time.Hour:time.Hour-12;time.Thour=time.hour<10?"0"+time.hour:time.hour;time.Minute=this.getMinutes();time.TMinute=time.Minute<10?"0"+time.Minute:time.Minute;time.Second=this.getSeconds();time.TSecond=time.Second<10?"0"+time.Second:time.Second;time.Millisecond=this.getMilliseconds();time.Week=this.getDay();var MMMArrEn=["Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"];var MMMArr=["一月","二月","三月","四月","五月","六月","七月","八月","九月","十月","十一月","十二月"];var WeekArrEn=["Sun","Mon","Tue","Web","Thu","Fri","Sat"];var WeekArr=["星期日","星期一","星期二","星期三","星期四","星期五","星期六"];var oNumber=time.Millisecond/1000;if(format!=undefined && format.replace(/\s/g,"").length>0){if(loc!=undefined && loc =="en"){MMMArr=MMMArrEn.slice(0);WeekArr=WeekArrEn.slice(0);}format=format.replace(/yyyy/ig,time.Year).replace(/yyy/ig,time.Year).replace(/yy/ig,time.TYear).replace(/y/ig,time.TYear).replace(/MMM/g,MMMArr[time.Month-1]).replace(/MM/g,time.TMonth).replace(/M/g,time.Month).replace(/dd/ig,time.TDay).replace(/d/ig,time.Day).replace(/HH/g,time.THour).replace(/H/g,time.Hour).replace(/hh/g,time.Thour).replace(/h/g,time.hour).replace(/mm/g,time.TMinute).replace(/m/g,time.Minute).replace(/ss/ig,time.TSecond).replace(/s/ig,time.Second).replace(/fff/ig,time.Millisecond).replace(/ff/ig,oNumber.toFixed(2)*100).replace(/f/ig,oNumber.toFixed(1)*10).replace(/EEE/g,WeekArr[time.Week]);}else{format=time.Year+"-"+time.Month+"-"+time.Day+" "+time.Hour+":"+time.Minute+":"+time.Second;}returnformat;
}var d=newDate();
console.log(d.toString());//2012-7-27 9:26:52
console.log(d.toString(""));    //2012-7-27 9:26:52
console.log(d.toString("yyyy-MM-dd HH:mm:ss"));    //2012-07-27 09:26:52
console.log(d.toString("yyyy年MM月dd日 HH:mm:ss"));    //2012年07月27日 09:26:52
console.log(d.toString("yyyy-MM-dd HH:mm:ss fff"));    //2012-07-27 09:26:52 237
console.log(d.toString("yyyy年 MMM dd EEE"));    //2012年 七月 27 星期五
console.log(d.toString("yyyy MMM dd EEE","en"));    //2012 Jul 27 Fri

五种继承方式

//构造函数的继承的五种方式
functionAnimal() {this.species = "dong wu";
}//NO.1 构造函数绑定
functionCat(name, color) {Animal.apply(this, arguments);this.name =name;this.color =color;
}//NO.2 prototype模式
functionCat (name, color) {this.name =name;this.color =color;
}
Cat.prototype= newAnimal();
Cat.prototype.constructor=Cat;//NO.3 直接继承prototype
functionCat(name, color) {this.name =name;this.color =color;
}
Cat.prototype=Animal.prototype;
Cat.prototype.constructor=Cat;//NO.4 利用空对象做中介
functionCat(name, color) {this.name =name;this.color =color;
}functionF(){}
F.prototype=Animal.prototype;Cat.prototype= newF();
Cat.prototype.constructor=Cat;//NO.5 拷贝继承
functionCat(name, color) {this.name =name;this.color =color;
}functionextend(Child, Parent) {var p =Parent.prototype;var c =Child.prototype;for (var i inp) {c[i]=p[i];}c.uber=p;
}
extend(Cat, Animal);

根据生日算年龄

functiongetAge(dateString) {var today = newDate();var birthDate = newDate(dateString);var age = today.getFullYear() -birthDate.getFullYear();var m = today.getMonth() -birthDate.getMonth();if (m < 0 || (m === 0 && today.getDate() <birthDate.getDate())) {age--;}returnage;
}
console.log(getAge("1990,1,12"));

事件绑定

var events = (function(win){//事件绑定functionon(el, ev, fn){if(el.addEventlistener){on= function(el, ev, fn) {el.addEventlistener(ev, fn,false);};}else if(el.attachEvent){on= function(el, ev, fn){el.attachEvent('on' + ev, function(){fn.call(el);//IE This
});};}else{on= function(el, ev, fn){el['on' + ev] =fn;};}on(el, ev, fn);}//解除事件绑定functionoff(el, ev, fn){if(el.removeEventlistener){off= function(el, ev, fn) {el.removeEventlistener(ev, fn,false);};}else if(el.detachEvent){off= function(el, ev, fn){el.detachEvent('on' +ev, fn);};}else{off= function(el, ev){el['on' + ev] = null;};}off(el, ev, fn);}//获取事件对象functiongetEvent(ev){return ev ||win.event;}//获取事件目标functiongetTarget(ev){return ev.target ||ev.srcElement;}//获取键值functiongetKeyCode(ev){if (typeof ev.charCode == 'number'){getKeyCode= function(ev){returnev.charCode;};}else{getKeyCode= function(ev){returnev.keyCode;};}getKeyCode(ev);}//阻止默认行为functionpreventDefault(ev){if(ev.preventDefault){preventDefault= function(ev){ev.preventDefault();};}else{preventDefault= function(ev){ev.returnValue= false;};}preventDefault(ev);}//阻止冒泡functionstopPropagation(ev){if(ev.stopPropagation){stopPropagation= function(ev){ev.stopPropagation();};}else{stopPropagation= function(ev){ev.cancelBubble= true;};}stopPropagation(ev);}return{on: on,off: off,getEvent: getEvent,getTarget: getTarget,getKeyCode: getKeyCode,preventDefault: preventDefault,stopPropagation: stopPropagation};
}(window));

自定义事件

var EventHandlers ={events: {},fire:function(ev, arg){if(this.events[ev]){var e = this.events[ev];for(var i = 0, len = e.length; i < len; i++){e[i](arg);}}},on:function(ev, fn){if(!this.events[ev]){this.events[ev] =[];}this.events[ev].push(fn);},off:function(ev, fn){if(this.events[ev]){var e = this.events[ev];for(var i = 0, len = e.length; i < len; i++){if(e[i] ==fn){e.splice(i,1);break;}}}}
};

加载获取图片尺寸

var img = newImage();
img.onload= function() {console.log(this.width + 'x' + this.height);
}

Object.create

var create = Object.create || function(o){var F = function(o){};F.prototype=o;return newF;
};

Object.prototype.bind

var bind = Object.prototype.bind || function(scope) {var fn = this;return function() {returnfn.apply(scope);};
};

设置选定文本

//选定文本
functionsetSelectText(text, start, num) {if(text.setSelectionRange) {text.setSelectionRange(start,num);text.focus();}else if(text.createTextRange) {var range =text.createTextRange();range.collapse(true);range.moveStart('character',start);range.moveEnd('character',num - start);                //用最后的位置 - 开始的位置 = 个数
range.select();}
}

获取选择文本

functiongetSelectedText(id){var o =document.getElementById(id);if(window.getSelection) {if(o.selectionStart != undefined && o.selectionEnd !=undefined){returno.value.substring(o.selectionStart, o.selectionEnd);}}else{returndocument.selection.createRange().text;}
}

在光标位置插入字符串

//光标位置插入字符串
functioninsertHtmlAtCursor(id, text){var o =document.getElementById(id);if(document.selection){o.focus();document.selection.createRange().text=text;o.focus();}else if(o.selectionStart) {var start = o.selectionStart, end =o.selectionEnd;o.value= o.value.substring(0, start) + text +o.value.substring(end, o.value.length);}
}

在url中查找指定参数的值

functiongetQuery(){var s = (location.search.length > 0 ? location.search.substring(1) : ''),res={},items= s.length ? s.split('&') : [],item= null, name = null, value = null,i, len=items.length;for (i = 0; i < len; i++){item= items[i].split('=');name= decodeURIComponent(item[0]);value= decodeURIComponent(item[1]);if(name.length){res[name]=value;}}returnres;
}

IE6里a:hover图片缓存

document.execCommand("BackgroundImageCache",false,true);

反转文本顺序

String.prototype.reverse = function(){if(this.length < 2){return this;}var str = this.split(''), result = '', len = this.length - 1;while(len >= 0){result+= this[len];len--;}returnresult;
}'反转文本顺序'.reverse();

清除空格

String.prototype.trim = String.trim || function() {return this.replace(/^\s*(.*?)\s+$/, "$1")
};

加入收藏

functionaddFavorite(url, title) {try{window.external.addFavorite(url, title);}catch(e) {try{window.sidebar.addPanel(title, url,"");}catch(e) {alert("加入收藏失败，请使用Ctrl+D进行添加");}}
}

设为首页

functionsetHomepage(url) {if(document.all) {document.body.style.behavior= 'url(#default#homepage)';document.body.setHomePage(url)}else if(window.sidebar) {if(window.netscape) {try{netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect")}catch(e) {alert("该操作被浏览器拒绝，如果想启用该功能，请在地址栏内输入 about:config,然后将项 signed.applets.codebase_principal_support 值该为true")}}var prefs = Components.classes['@mozilla.org/preferences-service;1'].getService(Components.interfaces.nsIPrefBranch);prefs.setCharPref('browser.startup.homepage', url)}
}

insertAfter

functioninsertAfter(newChild,refChild){var parElem=refChild.parentNode;if(parElem.lastChild==refChild){refChild.appendChild(newChild);}else{parElem.insertBefore(newChild,refChild.nextSibling);}
}

innerText操作

//获取innertext
functiongetInnerText(element) {if (typeof element.textContent == 'string') {returnelement.textContent;}else{returnelement.innerText;}
}//设置innertext
functionsetInnerText(element, text) {if (typeof element.textContent == 'string') {element.textContent=text;}else{element.innerText=text;}
}

获取offsetTop

//获取offsetTop
functionoffsetTop(element) {var top = element.offsetTop;        //第一层的距离var parent =element.offsetParent;while (parent !== null) {top+=parent.offsetTop;parent=parent.offsetParent;}returntop;
}

构建字符串的最优方法

var arr = ['item 1', 'item 2', 'item 3', ...];var list = '<ul><li>' + arr.join('</li><li>') + '</li></ul>';

获取字符串中出现次数最多的字符 

//NO.1
String.prototype.strCount = function(){var num = 0, val = '', result = null, temp = '', that = this;while(that) {temp=that;val= that.substr(0, 1);that= that.replace(new RegExp(val, "g"), "");if (temp.length - that.length >num) {num= temp.length -that.length;result={val:val, num: num};}}returnresult;
};//NO.2
String.prototype.strCount = function(){var obj = {}, num = 0, val = '';for(var i = 0, len = this.length; i < len; i+=1){if(!obj[this[i]]){obj[this[i]] =[];}obj[this[i]].push(this[i]);}for(var arr inobj){if(num <obj[arr].length){num=obj[arr].length;val= obj[arr][0];}}return{val:val, num: num};
};//NO.3
functionstrCount(str){var o = {}, ret = {name: '', num: 0};for(var i = 0, len = str.length; i < len; i++){if( o[str[i]] ) {o[str[i]]++;}else{o[str[i]]= 1;}if(ret.num <o[str[i]]){ret.name=str[i];ret.num=o[str[i]];}}returnret;}//NO.4
functionstrCount(str){var ret = {name: '', num: 0};str.split('').sort().join('').replace(/(\w)\1+/g, function($0, $1){if ( ret.num < $0.length ) {ret.num= $0.length;ret.name= $1;}});returnret;
}

对象深度clone 

var cloneObj = function(obj){varnewobj, s;if(typeof obj !== 'object'){return;}newobj= obj.constructor === Object ?{} : [];if(window.JSON){s= JSON.stringify(obj), //系列化对象newobj = JSON.parse(s); //反系列化（还原）}else{if(newobj.constructor ===Array){newobj.concat(obj);}else{for(var i inobj){newobj[i]=obj[i];}}}returnnewobj;
};

千分位表示

//NO.1
functionmillesimal(v){var num = v.length%3, prev = '', next = v.substring(num), arr =[];if(num !== 0){prev= v.substring(0, num);arr.push(prev);}for(var i = 0, len = next.length; i < len; i += 3){arr.push(next.substr(i,3))}returnarr.join();
}//NO.2
functionmillesimal(v){return v.toString().replace(/(?=(?!\b)(\d{3})+$)/g, ',');
}//NO.3
functionmillesimal(v){return v.toString().replace(/\B(?=(\d{3})+$)/g, ',');
}

替换全部

String.prototype.replaceAll = function(s1, s2) {return this.replace(new RegExp(s1, "gm"), s2)
}

HTML转义

//转义html标签
functionHtmlEncode(text) {return text.replace(/&/g, '&amp').replace(/\"/g, '&quot;').replace(/</g, '&lt;').replace(/>/g, '&gt;')
}//还原html标签
functionHtmlDecode(text) {return text.replace(/&amp;/g, '&').replace(/&quot;/g, '\"').replace(/&lt;/g, '<').replace(/&gt;/g, '>')
}

随机字符串（字母&数字）

functionrandomStringNum(len) {var ret = "";for( ; ret.length < len; ret += Math.random().toString(36).substr(2));return ret.substr(0, len);
}

随机颜色 

//(0xffffff+1) 表示颜色最大值(0x000000 ~ 0xffffff+1)//<<0             表示左移一位，将颜色16进制的颜色值转成整型//toString(16) 表示再将整型的颜色值转成16进制//slice(-6)     表示生成的16进制值少于6位时，首尾依次补0
var getRandomColor = function(){return '#'+('00000'+(Math.random()*(0xffffff+1)<<0).toString(16)).slice(-6);
};

curry

functioncurrying(fn) {var args = [].slice.call(arguments, 1);return function() {var newArgs =args.concat([].slice.call(arguments));return fn.apply(null, newArgs);}
}//use
var test = currying(function() {console.log(arguments);
},'a');test(1);

uncurrying

Function.prototype.uncurrying = function(){var self = this;return function(){returnFunction.prototype.call.apply(self, arguments);}
};

函数节流

//函数节流
var throttle = function(fn, interval){var self =fn,timer,firstTime= true;return function(){var args =arguments,that= this;if(firstTime){self.apply(that, args);return firstTime = false;}if(timer){return false;}timer= setTimeout(function(){clearTimeout(timer);timer= null;self.apply(that, args);}, interval|| 500);};
};

分时调用

/*** [timeChunk 分时调用]* @param  {[type]}   arr   [数据]* @param  {Function} fn    [处理函数]* @param  {[type]}   count [执行次数]*/
var timeChunk = function(arr, fn, count){var obj, t, len =arr.length;var start = function(){for (var i = 0, obj; i < Math.min(count || 1, arr.length); i++){obj=arr.shift();fn(obj);}};return function(){t= setInterval(function(){if (arr.length === 0){returnclearInterval(t);}start();},200);};
};

单例模式抽象

//单例模式抽象
var getSingle = function(fn){varres;return function(){return res || (res = fn.apply(this, arguments)); }
};