前端常用JS代码

1、设置Cookie

setCookie(参数名, 参数, expiredays)

function setCookie(c\_name, value, expiredays) {
    var exdate = new Date();
    var times = exdate.getTime() + parseInt(expiredays \* 24 \* 60 \* 60 \* 1000)
    exdate.setTime(times);
    document.cookie = c\_name + "=" + escape(value) +
        ((expiredays == null) ? "" : ";expires=" + exdate.toGMTString() + "; path=/")
}

2、读取Cookie

getCookie(参数名)

function getCookie(c\_name) {
    if (document.cookie.length > 0) {
        c\_start = document.cookie.indexOf(c\_name + "=")
        if (c\_start != -1) {
            c\_start = c\_start + c\_name.length + 1
            c\_end = document.cookie.indexOf(";", c\_start)
            if (c\_end == -1) c\_end = document.cookie.length
            return unescape(document.cookie.substring(c\_start, c\_end))
        }
    }
    return ""
}

3、截取最后一个斜杠前面的内容

function setIntercept(obj) {
    var index = obj.lastIndexOf("\\/");
    obj = obj.substring(0, index + 1);
    return obj;
}

4、截取?后面的内容

function setIntercept0(obj) {
    var index = obj.lastIndexOf("\\?");
    obj = obj.substring(index + 1, obj.length);
    return obj;
}

5、UUID

function uuid() {
    var s = \[\];
    var hexDigits = "0123456789abcdef";
    for (var i = 0; i < 36; i++) {
        s\[i\] = hexDigits.substr(Math.floor(Math.random() \* 0x10), 1);
    }
    s\[14\] = "4"; // bits 12-15 of the time\_hi\_and\_version field to 0010
    s\[19\] = hexDigits.substr((s\[19\] & 0x3)  0x8, 1); // bits 6-7 of the clock\_seq\_hi\_and\_reserved to 01
    s\[8\] = s\[13\] = s\[18\] = s\[23\] = "-";
    var uuid = s.join("");
    return uuid;
}

6、Base64加解密

var b = new Base64(); b.encode(加密数据) b.decode(解密数据)

function Base64() {
    \_keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
    this.encode = function(input) {
        var output = "";
        var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
        var i = 0;
        input = \_utf8\_encode(input);
        while (i < input.length) { chr1 = input.charCodeAt(i++); chr2 = input.charCodeAt(i++); chr3 = input.charCodeAt(i++); enc1 = chr1 >> 2;
            enc2 = ((chr1 & 3) << 4)  (chr2 >> 4);
            enc3 = ((chr2 & 15) << 2)  (chr3 >> 6);
            enc4 = chr3 & 63;
            if (isNaN(chr2)) {
                enc3 = enc4 = 64;
            } else if (isNaN(chr3)) {
                enc4 = 64;
            }
            output = output +
                \_keyStr.charAt(enc1) + \_keyStr.charAt(enc2) +
                \_keyStr.charAt(enc3) + \_keyStr.charAt(enc4);
        }
        return output;
    }
    this.decode = function(input) {
        var output = "";
        var chr1, chr2, chr3;
        var enc1, enc2, enc3, enc4;
        var i = 0;
        input = input.replace(/\[^A-Za-z0-9\\+\\/\\=\]/g, "");
        while (i < input.length) {
            enc1 = \_keyStr.indexOf(input.charAt(i++));
            enc2 = \_keyStr.indexOf(input.charAt(i++));
            enc3 = \_keyStr.indexOf(input.charAt(i++));
            enc4 = \_keyStr.indexOf(input.charAt(i++));
            chr1 = (enc1 << 2)  (enc2 >> 4);
            chr2 = ((enc2 & 15) << 4)  (enc3 >> 2);
            chr3 = ((enc3 & 3) << 6)  enc4;
            output = output + String.fromCharCode(chr1);
            if (enc3 != 64) {
                output = output + String.fromCharCode(chr2);
            }
            if (enc4 != 64) {
                output = output + String.fromCharCode(chr3);
            }
        }
        output = \_utf8\_decode(output);
        return output;
    }
    \_utf8\_encode = function(string) {
        string = string.replace(/\\r\\n/g, "\\n");
        var utftext = "";
        for (var n = 0; n < string.length; n++) {
            var c = string.charCodeAt(n);
            if (c < 128) { utftext += String.fromCharCode(c); } else if ((c > 127) && (c < 2048)) { utftext += String.fromCharCode((c >> 6)  192);
                utftext += String.fromCharCode((c & 63)  128);
            } else {
                utftext += String.fromCharCode((c >> 12)  224);
                utftext += String.fromCharCode(((c >> 6) & 63)  128);
                utftext += String.fromCharCode((c & 63)  128);
            }
        }
        return utftext;
    }
    \_utf8\_decode = function(utftext) {
        var string = "";
        var i = 0;
        var c = c1 = c2 = 0;
        while (i < utftext.length) {
            c = utftext.charCodeAt(i);
            if (c < 128) { string += String.fromCharCode(c); i++; } else if ((c > 191) && (c < 224)) {
                c2 = utftext.charCodeAt(i + 1);
                string += String.fromCharCode(((c & 31) << 6)  (c2 & 63));
                i += 2;
            } else {
                c2 = utftext.charCodeAt(i + 1);
                c3 = utftext.charCodeAt(i + 2);
                string += String.fromCharCode(((c & 15) << 12)  ((c2 & 63) << 6)  (c3 & 63));
                i += 3;
            }
        }
        return string;
    }
}

7、iframe 内外传参

iframeName.textInput(传的参数);
iframeName是iframe的name属性
textInput()是iframe嵌入页的函数名
document.getElementById(‘iframe’).contentWindow.playerParameter = ‘父页面传值’;
console.log(document.getElementById(‘iframe’).contentWindow. playerParameter )

8、微信窗口关闭

1	WeixinJSBridge.invoke('closeWindow', {}, function(rs) {});

9、获取当前时间戳

第一种方法：

1	var timestamp = Date.parse(new Date());

结果：1280977330000 第二种方法：

1	var timestamp = (new Date()).valueOf();

结果：1280977330748 第三种方法：

1	var timestamp=new Date().getTime()；

结果：1280977330748 以上代码将获取从 1970年1月1日午夜开始的毫秒数。二者的区别是，第一种方法的毫秒位上为全零，即只是精确到秒的毫秒数 jQuery 获取时间戳 $.now()

1	var timestamp = $.now();

当前时间时间戳

1	Math.round(new Date().getTime()/1000)

10、JS异步加载

有时候加载JS文件慢，可能造成网页失去响应。解决办法有两个，一个是把它放在网页底部加载，另一个是写成下面这样：

async属性表明这个文件需要异步加载，避免网页失去响应。IE不支持这个属性，只支持defer，所以把defer也写上。

11、清除空格

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

12、清除左空格/右空格

1 2	function ltrim(s){ return s.replace( /^(\\s\* \)/, ""); } function rtrim(s){ return s.replace( /(\\s\ \*)$/, ""); }

13、字符串长度截取

function cutstr(str, len) {
var temp,
icount = 0,
patrn = /\[^\\x00-\\xff\]/，
strre = "";
for (var i = 0; i < str.length; i++) {
if (icount < len - 1) {
temp = str.substr(i, 1);
if (patrn.exec(temp) == null) {
   icount = icount + 1
} else {
icount = icount + 2
}
strre += temp
} else {
break;
}
}
return strre + "..."
}

14、判断是否为数字类型

function isDigit(value) {
    var patrn = /^\[0-9\]\*$/;
    if (patrn.exec(value) == null  value == "") {
        return false
    } else {
        return true
    }
}

15、加入收藏夹

function AddFavorite(sURL, sTitle) {
try {
window.external.addFavorite(sURL, sTitle)
} catch(e) {
try {
window.sidebar.addPanel(sTitle, sURL, "")
} catch(e) {
alert("加入收藏失败，请使用Ctrl+D进行添加")
}
}
}

16、设为首页

function setHomepage() {
if (document.all) {
document.body.style.behavior = 'url(#default#homepage)';
document.body.setHomePage('http://w3cboy.com')
} 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', 'http://w3cboy.com')
}
}

17、加载样式文件

function LoadStyle(url) {
try {
document.createStyleSheet(url)
} catch(e) {
var cssLink = document.createElement('link');
cssLink.rel = 'stylesheet';
cssLink.type = 'text/css';
cssLink.href = url;
var head = document.getElementsByTagName('head')\[0\];
head.appendChild(cssLink)
}
}

18、检验URL链接是否有效

function getUrlState(URL){
var xmlhttp = new ActiveXObject("microsoft.xmlhttp");
xmlhttp.Open("GET",URL, false);
try{
xmlhttp.Send();
}catch(e){
}finally{
var result = xmlhttp.responseText;
if(result){
if(xmlhttp.Status==200){
return(true);
 }else{
   return(false);
 }
 }else{
 return(false);
 }
}
}

19、格式化CSS样式代码

function formatCss(s){//格式化代码
s = s.replace(/\\s\*(\[\\{\\}\\:\\;\\,\])\\s\*/g, "$1");
s = s.replace(/;\\s\*;/g, ";"); //清除连续分号
s = s.replace(/\\,\[\\s\\.\\#\\d\]\*{/g, "{");
s = s.replace(/(\[^\\s\])\\{(\[^\\s\])/g, "$1 {\\n\\t$2");
s = s.replace(/(\[^\\s\])\\}(\[^\\n\]\*)/g, "$1\\n}\\n$2");
s = s.replace(/(\[^\\s\]);(\[^\\s\\}\])/g, "$1;\\n\\t$2");
return s;
}

20、压缩CSS样式代码

function compressCss (s) {//压缩代码
s = s.replace(/\\/\\\*(.\\n)\*?\\\*\\//g, ""); //删除注释
s = s.replace(/\\s\*(\[\\{\\}\\:\\;\\,\])\\s\*/g, "$1");
s = s.replace(/\\,\[\\s\\.\\#\\d\]\*\\{/g, "{"); //容错处理
s = s.replace(/;\\s\*;/g, ";"); //清除连续分号
s = s.match(/^\\s\*(\\S+(\\s+\\S+)\*)\\s\*$/); //去掉首尾空白
return (s == null) ? "" : s\[1\];
}

21、判断是否移动设备

function isMobile(){
if (typeof this.\_isMobile === 'boolean'){
return this.\_isMobile;
}
var screenWidth = this.getScreenWidth();
var fixViewPortsExperiment = rendererModel.runningExperiments.FixViewport rendererModel.runningExperiments.fixviewport;
var fixViewPortsExperimentRunning = fixViewPortsExperiment && (fixViewPortsExperiment.toLowerCase() === "new");
if(!fixViewPortsExperiment){
if(!this.isAppleMobileDevice()){
screenWidth = screenWidth/window.devicePixelRatio;
}
}
var isMobileScreenSize = screenWidth < 600;
var isMobileUserAgent = false;
this.\_isMobile = isMobileScreenSize && this.isTouchScreen();
return this.\_isMobile;
}

22、判断是否移动设备访问

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function isMobileUserAgent(){
    return (/iphoneipodandroid.\*mobilewindows.\*phoneblackberry.\*mobile/i.test(window.navigator.userAgent.toLowerCase()));
}

23、判断是否苹果移动设备访问

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function isAppleMobileDevice(){
    return (/iphoneipodipadMacintosh/i.test(navigator.userAgent.toLowerCase()));
}

24、判断是否安卓移动设备访问

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function isAndroidMobileDevice(){
    return (/android/i.test(navigator.userAgent.toLowerCase()));
}

25、获取移动设备初始化大小

function getInitZoom(){
if(!this.\_initZoom){
var screenWidth = Math.min(screen.height, screen.width);
if(this.isAndroidMobileDevice() && !this.isNewChromeOnAndroid()){
screenWidth = screenWidth/window.devicePixelRatio;
}
this.\_initZoom = screenWidth /document.body.offsetWidth;
}
return this.\_initZoom;
}

26、获取移动设备屏幕宽度

function getScreenWidth(){
var smallerSide = Math.min(screen.width, screen.height);
var fixViewPortsExperiment = rendererModel.runningExperiments.FixViewport  rendererModel.runningExperiments.fixviewport;
var fixViewPortsExperimentRunning = fixViewPortsExperiment && (fixViewPortsExperiment.toLowerCase() === "new");
if(fixViewPortsExperiment){
if(this.isAndroidMobileDevice() && !this.isNewChromeOnAndroid()){
smallerSide = smallerSide/window.devicePixelRatio;
}
}
return smallerSide;
}

27、完美判断是否为网址

function IsURL(strUrl) {
    var regular = /^\\b(((https?ftp):\\/\\/)?\[-a-z0-9\]+(\\.\[-a-z0-9\]+)\*\\.(?:comedugovintmilnetorgbizinfonamemuseumasiacoopaero\[a-z\]\[a-z\]((25\[0-5\])(2\[0-4\]\\d)(1\\d\\d)(\[1-9\]\\d)\\d))\\b(\\/\[-a-z0-9\_:\\@&?=+,.!\\/~%\\$\]\*)?)$/i
    if (regular.test(strUrl)) {
        return true;
    }else {
        return false;
    }
}

28、获取页面高度

function getPageHeight(){
    var g = document, a = g.body, f = g.documentElement, d = g.compatMode == "BackCompat"
                    ? a
                    : g.documentElement;
    return Math.max(f.scrollHeight, a.scrollHeight, d.clientHeight);
}

29、获取页面可视宽度

function getPageViewWidth(){
    var d = document, a = d.compatMode == "BackCompat"
                    ? d.body
                    : d.documentElement;
    return a.clientWidth;
}

30、获取页面宽度

function getPageWidth(){
    var g = document, a = g.body, f = g.documentElement, d = g.compatMode == "BackCompat"
                    ? a
                    : g.documentElement;
    return Math.max(f.scrollWidth, a.scrollWidth, d.clientWidth);
}

31、获取页面scrollTop

function getPageScrollTop(){
    var a = document;
    return a.documentElement.scrollTop  a.body.scrollTop;
}

32、获取页面可视高度

function getPageViewHeight() {
    var d = document, a = d.compatMode == "BackCompat"
                    ? d.body
                    : d.documentElement;
    return a.clientHeight;
}

33、去掉url前缀

function removeUrlPrefix(a){
    a=a.replace(/：/g,":").replace(/．/g,".").replace(/／/g,"/");
    while(trim(a).toLowerCase().indexOf("http://")==0){
        a=trim(a.replace(/http:\\/\\//i,""));
    }
    return a;
}

34、全角半角转换

//iCase: 0全到半，1半到全，其他不转化
function chgCase(sStr,iCase){
if(typeof sStr != "string"  sStr.length <= 0  !(iCase === 0  iCase == 1)){ return sStr; } var i,oRs=\[\],iCode; if(iCase){/\*半->全\*/
for(i=0; i<sStr.length;i+=1){
iCode = sStr.charCodeAt(i);
if(iCode == 32){
iCode = 12288;
}else if(iCode < 127){ iCode += 65248; } oRs.push(String.fromCharCode(iCode)); } }else{/\*全->半\*/
for(i=0; i<sStr.length;i+=1){ iCode = sStr.charCodeAt(i); if(iCode == 12288){ iCode = 32; }else if(iCode > 65280 && iCode < 65375){
iCode -= 65248;
}
oRs.push(String.fromCharCode(iCode));
 }
}
return oRs.join("");
}

35、日期格式化函数+调用方法

Date.prototype.format = function(format){
var o = {
"M+" : this.getMonth()+1, //month
"d+" : this.getDate(),//day
"h+" : this.getHours(),   //hour
"m+" : this.getMinutes(), //minute
"s+" : this.getSeconds(), //second
"q+" : Math.floor((this.getMonth()+3)/3),  //quarter
"S" : this.getMilliseconds() //millisecond
};
if(/(y+)/.test(format)) format=format.replace(RegExp.$1,
(this.getFullYear()+"").substr(4 - RegExp.$1.length));
for(var k in o){
if(new RegExp("("+ k +")").test(format))
format = format.replace(RegExp.$1,RegExp.$1.length==1 ? o\[k\] :("00"+ o\[k\]).substr((""+ o\[k\]).length));
}
return format;
}
alert(new Date().format("yyyy-MM-dd hh:mm:ss"));

36、时间个性化输出功能

/\*
1、< 60s, 显示为“刚刚” 2、>= 1min && < 60 min, 显示与当前时间差“XX分钟前” 3、>= 60min && < 1day, 显示与当前时间差“今天 XX:XX” 4、>= 1day && < 1year, 显示日期“XX月XX日 XX:XX” 5、>= 1year, 显示具体日期“XXXX年XX月XX日 XX:XX”
\*/
function timeFormat(time){
var date = new Date(time),
curDate = new Date(),
year = date.getFullYear(),
month = date.getMonth() + 10,
day = date.getDate(),
hour = date.getHours(),
minute = date.getMinutes(),
curYear = curDate.getFullYear(),
curHour = curDate.getHours(),
timeStr;
if(year < curYear){ timeStr = year +'年'+ month +'月'+ day +'日 '+ hour +':'+ minute; }else{ var pastTime = curDate - date, pastH = pastTime/3600000; if(pastH > curHour){
  timeStr = month +'月'+ day +'日 '+ hour +':'+ minute;
}else if(pastH >= 1){
  timeStr = '今天 ' + hour +':'+ minute +'分';
}else{
  var pastM = curDate.getMinutes() - minute;
  if(pastM > 1){
timeStr = pastM +'分钟前';
  }else{
timeStr = '刚刚';
  }
}
}
return timeStr;
}

37、解决offsetX兼容性问题

// 针对火狐不支持offsetX/Y
function getOffset(e){
var target = e.target, // 当前触发的目标对象
  eventCoord,
  pageCoord,
  offsetCoord;
// 计算当前触发元素到文档的距离
pageCoord = getPageCoord(target);
// 计算光标到文档的距离
eventCoord = {
X : window.pageXOffset + e.clientX,
Y : window.pageYOffset + e.clientY
};
// 相减获取光标到第一个定位的父元素的坐标
offsetCoord = {
X : eventCoord.X - pageCoord.X,
Y : eventCoord.Y - pageCoord.Y
};
return offsetCoord;
}
function getPageCoord(element){
var coord = { X : 0, Y : 0 };
// 计算从当前触发元素到根节点为止，
// 各级 offsetParent 元素的 offsetLeft 或 offsetTop 值之和
while (element){
coord.X += element.offsetLeft;
coord.Y += element.offsetTop;
element = element.offsetParent;
}
return coord;
}

38、返回顶部的通用方法

function backTop(btnId) {
var btn = document.getElementById(btnId);
var d = document.documentElement;
var b = document.body;
window.onscroll = set;
btn.style.display = "none";
btn.onclick = function() {
btn.style.display = "none";
window.onscroll = null;
this.timer = setInterval(function() {
d.scrollTop -= Math.ceil((d.scrollTop + b.scrollTop) \* 0.1);
b.scrollTop -= Math.ceil((d.scrollTop + b.scrollTop) \* 0.1);
if ((d.scrollTop + b.scrollTop) == 0) clearInterval(btn.timer, window.onscroll = set);
}, 10);
};
function set() {
btn.style.display = (d.scrollTop + b.scrollTop > 100) ? 'block': "none"
}
};
backTop('goTop');

39、提取页面代码中所有网址

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var aa = document.documentElement.outerHTML.match(/(url\\(src=href=)\[\\"\\'\]\*(\[^\\"\\'\\(\\)\\<\\>\\\[\\\] \]+)\[\\"\\'\\)\]\*(http:\\/\\/\[\\w\\-\\.\]+\[^\\"\\'\\(\\)\\<\\>\\\[\\\] \]+)/ig).join("\\r\\n").replace(/^(src=href=url\\()\[\\"\\'\]\*\[\\"\\'\\>\\) \]\*$/igm,"");
alert(aa);

40、清除相同的数组

String.prototype.unique=function(){
var x=this.split(/\[\\r\\n\]+/);
var y='';
for(var i=0;i<x.length;i++){
if(!new RegExp("^"+x.replace(/(\[^\\w\])/ig,"\\\\$1")+"$","igm").test(y)){
y+=x+"\\r\\n"
}
}
return y
};

41、按字母排序，对每行进行数组排序

function SetSort(){
    var text=K1.value.split(/\[\\r\\n\]/).sort().join("\\r\\n");//顺序
    var test=K1.value.split(/\[\\r\\n\]/).sort().reverse().join("\\r\\n");//反序
    K1.value=K1.value!=text?text:test;
}

42、字符串反序(倒序)

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function IsReverse(text){
    return text.split('').reverse().join('');
}

43、清除html代码中的脚本

function clear\_script(){
K1.value=K1.value.replace(/<script.\*?>\[\\s\\S\]\*?<\\/script>\\s+on\[a-zA-Z\]{3,16}\\s?=\\s?"\[\\s\\S\]\*?"\\s+on\[a-zA-Z\]{3,16}\\s?=\\s?'\[\\s\\S\]\*?'\\s+on\[a-zA-Z\]{3,16}\\s?=\[^ >\]+/ig,"");
}
动态执行JavaScript脚本
function javascript(){
try{
  eval(K1.value);
}catch(e){
  alert(e.message);
}
}

44、金额大写转换函数

function transform(tranvalue) {
try {
var i = 1;
var dw2 = new Array("", "万", "亿"); //大单位
var dw1 = new Array("拾", "佰", "仟"); //小单位
var dw = new Array("零", "壹", "贰", "叁", "肆", "伍", "陆", "柒", "捌", "玖"); //整数部分用
//以下是小写转换成大写显示在合计大写的文本框中
//分离整数与小数
var source = splits(tranvalue);
var num = source\[0\];
var dig = source\[1\];
//转换整数部分
var k1 = 0; //计小单位
var k2 = 0; //计大单位
var sum = 0;
var str = "";
var len = source\[0\].length; //整数的长度
for (i = 1; i <= len; i++) { var n = source\[0\].charAt(len - i); //取得某个位数上的数字 var bn = 0; if (len - i - 1 >= 0) {
bn = source\[0\].charAt(len - i - 1); //取得某个位数前一位上的数字
  }
  sum = sum + Number(n);
  if (sum != 0) {
str = dw\[Number(n)\].concat(str); //取得该数字对应的大写数字，并插入到str字符串的前面
if (n == '0') sum = 0;
  }
  if (len - i - 1 >= 0) { //在数字范围内
if (k1 != 3) { //加小单位
  if (bn != 0) {
str = dw1\[k1\].concat(str);
  }
  k1++;
} else { //不加小单位，加大单位
  k1 = 0;
  var temp = str.charAt(0);
  if (temp == "万"  temp == "亿") //若大单位前没有数字则舍去大单位
  str = str.substr(1, str.length - 1);
  str = dw2\[k2\].concat(str);
  sum = 0;
}
  }
  if (k1 == 3){ //小单位到千则大单位进一
k2++;
  }
}
//转换小数部分
var strdig = "";
if (dig != "") {
  var n = dig.charAt(0);
  if (n != 0) {
strdig += dw\[Number(n)\] + "角"; //加数字
  }
  var n = dig.charAt(1);
  if (n != 0) {
strdig += dw\[Number(n)\] + "分"; //加数字
  }
}
str += "元" + strdig;
} catch(e) {
return "0元";
}
return str;
}
//拆分整数与小数
function splits(tranvalue) {
var value = new Array('', '');
temp = tranvalue.split(".");
for (var i = 0; i < temp.length; i++) {
value = temp;
}
return value;
}

45、js阻止冒泡事件

function stopPropagation(e) {
    e = e  window.event;
    if(e.stopPropagation) { //W3C阻止冒泡方法
        e.stopPropagation();
    } else {
        e.cancelBubble = true; //IE阻止冒泡方法
    }
}

46、判断某值知否在数组中

Array.prototype.isContainsValue=function(value) {
    for(var i in this){
        if(this\[i\]==value){
            return true;
        }
    }
    return false;
};

47、根据一个值删除某元素

Array.prototype.delByValue=function(value) {
    for(var i = 0;i<this.length;i++){
        if(this\[i\] == value){
            this.del(i);
        }
    }
};

48、根据下标删除某元素

Array.prototype.del=function(n) {
    if(n<0) return this;
    else
        return this.slice(0,n).concat(this.slice(n+1,this.length));
};

49、检查密码强度

$('#pass').keyup(function (e)
{
    var strongRegex = new RegExp("^(?=.{8,})(?=.\*\[A-Z\])(?=.\*\[a-z\])(?=.\*\[0-9\])(?=.\*\\W).\*$", "g");
    var mediumRegex = new RegExp("^(?=.{7,})(((?=.\*\[A-Z\])(?=.\*\[a-z\]))((?=.\*\[A-Z\])(?=.\*\[0-9\]))((?=.\*\[a-z\])(?=.\*\[0-9\]))).\*$", "g");
    var enoughRegex = new RegExp("(?=.{6,}).\*", "g");
    if (false == enoughRegex.test($(this).val()))
    {
        $('#passstrength').html('More Characters');
    }
    else if (strongRegex.test($(this).val()))
    {
        $('#passstrength').className = 'ok';
        $('#passstrength').html('强!');
    }
    else if (mediumRegex.test($(this).val()))
    {
        $('#passstrength').className = 'alert';
        $('#passstrength').html('中!');
    }
    else
    {
        $('#passstrength').className = 'error';
        $('#passstrength').html('弱!');
    }
    return true;
}
);

50、js去除字符串中特殊符号

var a = 'dsfhhdifhg%dfg#dfhgfh'
var b = a.replace(/\[&\\\\\\\\\*^%$#@\\-\]/g,"");
console.log(b)
输出 b = 'dsfhhdifhgdfgdfhgfh'

秒转成时分秒格式

function musicTimeFormat(value) {
    var theTime = parseInt(value); // 秒
    var theTime1 = 0; // 分
    var theTime2 = 0; // 小时
    // alert(theTime);
    if (theTime > 60) {
        theTime1 = parseInt(theTime / 60);
        theTime = parseInt(theTime % 60);
        if (theTime1 > 60) {
            theTime2 = parseInt(theTime1 / 60);
            theTime1 = parseInt(theTime1 % 60);
        }
    }
    var result = "" + parseInt(theTime) + "秒";
    if (theTime1 > 0) {
        result = "" + parseInt(theTime1) + "分" + result;
    }
    if (theTime2 > 0) {
        result = "" + parseInt(theTime2) + "小时" + result;
    }
    return result;
}

51、数组去重

方法一：

Array.prototype.distinct = function(){
 var arr = this,
  result = \[\],
  i,
  j,
  len = arr.length;
 for(i = 0; i < len; i++){
  for(j = i + 1; j < len; j++){
   if(arr\[i\] === arr\[j\]){
    j = ++i;
   }
  }
  result.push(arr\[i\]);
 }
 return result;
}
var arra = \[1,1,1,1,1,1,1,1,1,2,2,2,2,2,2,3,3,3,3,3,3,3,2,3,3,2,2,1,23,1,23,2,3,2,3,2,3\];
arra.distinct();    //返回\[1, 23, 2, 3\]

方法二：

Array.prototype.distinct = function (){
 var arr = this,
  i,
  obj = {},
  result = \[\],
  len = arr.length;
 for(i = 0; i< arr.length; i++){
  if(!obj\[arr\[i\]\]){ //如果能查找到，证明数组元素重复了
   obj\[arr\[i\]\] = 1;
   result.push(arr\[i\]);
  }
 }
 return result;
};
var a = \[1,1,1,1,1,1,1,1,1,2,2,2,2,2,2,3,3,3,3,3,3,3,2,3,3,2,2,1,23,1,23,2,3,2,3,2,3\];
var b = a.distinct();
console.log(b.toString()); //1,2,3,23

方法三：

Array.prototype.distinct = function (){
 var arr = this,
  result = \[\],
  len = arr.length;
 arr.forEach(function(v, i ,arr){  //这里利用map，filter方法也可以实现
  var bool = arr.indexOf(v,i+1);  //从传入参数的下一个索引值开始寻找是否存在重复
  if(bool === -1){
   result.push(v);
  }
 })
 return result;
};
var a = \[1,1,1,1,1,1,1,1,1,2,2,2,2,2,2,3,3,3,3,3,3,3,2,3,3,2,2,1,23,1,23,2,3,2,3,2,3\];
var b = a.distinct();
console.log(b.toString()); //1,23,2,3

方法四：

function arrRmRepeat(arr) {
    var newArr = \[\];
    for (var i = 0; i < arr.length; i++) {
    if (newArr.indexOf(arr\[i\]) == -1) {
    newArr.push(arr\[i\])
    }
    }
    return newArr;
}

方法五：

1
2
3

function arrRmRepeat(arr) {
    return \[...new Set(arr)\];
}

52、合并数组并去重