您的位置：首页 > Web前端 > JavaScript

100个JavaScript代码片段

2020-07-14 06:27 609 查看

100个JavaScript代码片段

100个JavaScript代码片段

▷实现字符串长度截取

function cutstr(str, len) {
var temp;
var icount = 0;
var patrn = /[^\x00-\xff]/;
var 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 + "..."
}

▷获取域名主机

function getHost(url) {
var host = "null";
if(typeof url == "undefined"|| null == url) {
url = window.location.href;
}
var regex = /^\w+\:\/\/([^\/]*).*/;
var match = url.match(regex);
if(typeof match != "undefined" && null != match) {
host = match[1];
}
return host;
}

▷清除空格

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

▷替换全部

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

▷转义html标签

function HtmlEncode(text) {
return text.replace(/&/g, '&amp').replace(/\"/g, '&quot;').replace(/</g, '&lt;').replace(/>/g, '&gt;')
}

▷生JavaScript还原html标签

function HtmlDecode(text) {
return text.replace(/&amp;/g, '&').replace(/&quot;/g, '\"').replace(/&lt;/g, '<').replace(/&gt;/g, '>')
}

▷时间日期格式转换

Date.prototype.Format = function(formatStr) {
var str = formatStr;
var Week = ['日', '一', '二', '三', '四', '五', '六'];
str = str.replace(/yyyy|YYYY/, this.getFullYear());
str = str.replace(/yy|YY/, (this.getYear() % 100) > 9 ? (this.getYear() % 100).toString() : '0' + (this.getYear() % 100));
str = str.replace(/MM/, (this.getMonth() + 1) > 9 ? (this.getMonth() + 1).toString() : '0' + (this.getMonth() + 1));
str = str.replace(/M/g, (this.getMonth() + 1));
str = str.replace(/w|W/g, Week[this.getDay()]);
str = str.replace(/dd|DD/, this.getDate() > 9 ? this.getDate().toString() : '0' + this.getDate());
str = str.replace(/d|D/g, this.getDate());
str = str.replace(/hh|HH/, this.getHours() > 9 ? this.getHours().toString() : '0' + this.getHours());
str = str.replace(/h|H/g, this.getHours());
str = str.replace(/mm/, this.getMinutes() > 9 ? this.getMinutes().toString() : '0' + this.getMinutes());
str = str.replace(/m/g, this.getMinutes());
str = str.replace(/ss|SS/, this.getSeconds() > 9 ? this.getSeconds().toString() : '0' + this.getSeconds());
str = str.replace(/s|S/g, this.getSeconds());
return str
}

▷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
}
}

▷设置cookie值

function setCookie(name, value, Hours) {
var d = new Date();
var offset = 8;
var utc = d.getTime() + (d.getTimezoneOffset() * 60000);
var nd = utc + (3600000 * offset);
var exp = new Date(nd);
exp.setTime(exp.getTime() + Hours * 60 * 60 * 1000);
document.cookie = name + "=" + escape(value) + ";path=/;expires=" + exp.toGMTString() + ";domain=360doc.com;"
}

▷获取cookie值

function getCookie(name) {
var arr = document.cookie.match(new RegExp("(^| )" + name + "=([^;]*)(;|$)"));
if (arr != null) return unescape(arr[2]);
return null
}

▷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")
}
}
}

▷设为首页

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

▷判断IE6

var ua = navigator.userAgent.toLowerCase();
var isIE6 = ua.indexOf("msie 6") > -1;
if (isIE6) {
try {
document.execCommand("BackgroundImageCache", false, true)
} catch(e) {}
}

▷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)
}
}

▷返回脚本内容

function evalscript(s) {
if(s.indexOf('<script') == -1) return s;
var p = /<script[^\>]*?>([^\x00]*?)<\/script>/ig;
var arr = [];
while(arr = p.exec(s)) {
var p1 = /<script[^\>]*?src=\"([^\>]*?)\"[^\>]*?(reload=\"1\")?(?:charset=\"([\w\-]+?)\")?><\/script>/i;
var arr1 = [];
arr1 = p1.exec(arr[0]);
if(arr1) {
appendscript(arr1[1], '', arr1[2], arr1[3]);
} else {
p1 = /<script(.*?)>([^\x00]+?)<\/script>/i;
arr1 = p1.exec(arr[0]);
appendscript('', arr1[2], arr1[1].indexOf('reload=') != -1);
}
}
return s;
}

▷清除脚本内容

function stripscript(s) {
return s.replace(/<script.*?>.*?<\/script>/ig, '');
}

▷动态加载脚本文件

function appendscript(src, text, reload, charset) {
var id = hash(src + text);
if(!reload && in_array(id, evalscripts)) return;
if(reload && $(id)) {
$(id).parentNode.removeChild($(id));
}

evalscripts.push(id);
var scriptNode = document.createElement("script");
scriptNode.type = "text/javascript";
scriptNode.id = id;
scriptNode.charset = charset ? charset : (BROWSER.firefox ? document.characterSet : document.charset);
try {
if(src) {
scriptNode.src = src;
scriptNode.onloadDone = false;
scriptNode.onload = function () {
scriptNode.onloadDone = true;
JSLOADED[src] = 1;
};
scriptNode.onreadystatechange = function () {
if((scriptNode.readyState == 'loaded' || scriptNode.readyState == 'complete') && !scriptNode.onloadDone) {
scriptNode.onloadDone = true;
JSLOADED[src] = 1;
}
};
} else if(text){
scriptNode.text = text;
}
document.getElementsByTagName('head')[0].appendChild(scriptNode);
} catch(e) {}
}

▷返回按ID检索的元素对象

function $(id) {
return !id ? null : document.getElementById(id);
}

▷返回浏览器版本内容

function browserVersion(types) {
var other = 1;
for(i in types) {
var v = types[i] ? types[i] : i;
if(USERAGENT.indexOf(v) != -1) {
var re = new RegExp(v + '(\\/|\\s)([\\d\\.]+)', 'ig');
var matches = re.exec(USERAGENT);
var ver = matches != null ? matches[2] : 0;
other = ver !== 0 && v != 'mozilla' ? 0 : other;
}else {
var ver = 0;
}
eval('BROWSER.' + i + '= ver');
}
BROWSER.other = other;
}

▷元素显示的通用方法

function $(id) {
return !id ? null : document.getElementById(id);
}
function display(id) {
var obj = $(id);
if(obj.style.visibility) {
obj.style.visibility = obj.style.visibility == 'visible' ? 'hidden' : 'visible';
} else {
obj.style.display = obj.style.display == '' ? 'none' : '';
}
}

▷中有insertBefore方法,可惜却没有insertAfter方法?用如下函数实现

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

▷中兼容浏览器绑定元素事件

function addEventSamp(obj,evt,fn){
if (obj.addEventListener) {
obj.addEventListener(evt, fn, false);
}else if(obj.attachEvent){
obj.attachEvent('on'+evt,fn);
}
}

▷光标停在文字的后面，文本框获得焦点时调用

function focusLast(){
var e = event.srcElement;
var r =e.createTextRange();
r.moveStart('character',e.value.length);
r.collapse(true);
r.select();
}

▷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);
}
}
}

▷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;
}

▷压缩CSS样式代码

function yasuoCss (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];
}

▷获取当前路径

var currentPageUrl = "";
if (typeof this.href === "undefined") {
currentPageUrl = document.location.toString().toLowerCase();
}
else {
currentPageUrl = this.href.toString().toLowerCase();
}

▷IP转成整型

function _ip2int(ip){
var num = 0;
ip = ip.split(".");
num = Number(ip[0]) * 256 * 256 * 256 + Number(ip[1]) * 256 * 256 + Number(ip[2]) * 256 + Number(ip[3]);
num = num >>> 0;
return num;
}

▷整型解析为IP地址

function _int2iP(num){
var str;
var tt = new Array();
tt[0] = (num >>> 24) >>> 0;
tt[1] = ((num << 8) >>> 24) >>> 0;
tt[2] = (num << 16) >>> 24;
tt[3] = (num << 24) >>> 24;
str = String(tt[0]) + "." + String(tt[1]) + "." + String(tt[2]) + "." + String(tt[3]);
return str;
}

▷实现checkbox全选与全不选

function checkAll() {
var selectall = document.getElementById("selectall");
var allbox = document.getElementsByName("allbox");
if (selectall.checked) {
for (var i = 0; i < allbox.length; i++) {
allbox[i].checked = true;
}
} else {
for (var i = 0; i < allbox.length; i++) {
allbox[i].checked = false;
}
}
}

▷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;
}

▷判断是否移动设备访问

function isMobileUserAgent(){
return (/iphone|ipod|android.*mobile|windows.*phone|blackberry.*mobile/i.test(window.navigator.userAgent.toLowerCase()));
}

▷判断是否苹果移动设备访问

1 function isAppleMobileDevice(){
2     return (/iphone|ipod|ipad|Macintosh/i.test(navigator.userAgent.toLowerCase()));
3 }

▷判断是否安卓移动设备访问

1 function isAndroidMobileDevice(){
2     return (/android/i.test(navigator.userAgent.toLowerCase()));
3 }

▷判断是否Touch屏幕

1 function isTouchScreen(){
2     return (('ontouchstart' in window) || window.DocumentTouch && document instanceof DocumentTouch);
3 }

▷判断是否在安卓上的谷歌浏览器

function isNewChromeOnAndroid(){
if(this.isAndroidMobileDevice()){
var userAgent = navigator.userAgent.toLowerCase();
if((/chrome/i.test(userAgent))){
var parts = userAgent.split('chrome/');

var fullVersionString = parts[1].split(" ")[0];
var versionString = fullVersionString.split('.')[0];
var version = parseInt(versionString);

if(version >= 27){
return true;
}
}
}
return false;
}

▷判断是否打开视窗

1 function isViewportOpen() {
2     return !!document.getElementById('wixMobileViewport');
3 }

▷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;
}

▷获取移动设备最大化大小

function getZoom(){
var screenWidth = (Math.abs(window.orientation) === 90) ? Math.max(screen.height, screen.width) : Math.min(screen.height, screen.width);
if(this.isAndroidMobileDevice() && !this.isNewChromeOnAndroid()){
screenWidth = screenWidth/window.devicePixelRatio;
}
var FixViewPortsExperiment = rendererModel.runningExperiments.FixViewport || rendererModel.runningExperiments.fixviewport;
var FixViewPortsExperimentRunning = FixViewPortsExperiment && (FixViewPortsExperiment === "New" || FixViewPortsExperiment === "new");
if(FixViewPortsExperimentRunning){
return screenWidth / window.innerWidth;
}else{
return screenWidth / document.body.offsetWidth;
}
}

▷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;
}

▷完美判断是否为网址

function IsURL(strUrl) {
var regular = /^\b(((https?|ftp):\/\/)?[-a-z0-9]+(\.[-a-z0-9]+)*\.(?:com|edu|gov|int|mil|net|org|biz|info|name|museum|asia|coop|aero|[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;
}
}

▷根据样式名称检索元素对象

function getElementsByClassName(name) {
var tags = document.getElementsByTagName('*') || document.all;
var els = [];
for (var i = 0; i < tags.length; i++) {
if (tags[i].className) {
var cs = tags[i].className.split(' ');
for (var j = 0; j < cs.length; j++) {
if (name == cs[j]) {
els.push(tags[i]);
break
}
}
}
}
return els
}

▷判断是否以某个字符串开头

1 String.prototype.startWith = function (s) {
2     return this.indexOf(s) == 0
3 }

▷判断是否以某个字符串结束

1 String.prototype.endWith = function (s) {
2     var d = this.length - s.length;
3     return (d >= 0 && this.lastIndexOf(s) == d)
4 }

▷返回IE浏览器的版本号

function getIE(){
if (window.ActiveXObject){
var v = navigator.userAgent.match(/MSIE ([^;]+)/)[1];
return parseFloat(v.substring(0, v.indexOf(".")))
}
return false
}

▷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);
}

▷获取页面scrollLeft

function getPageScrollLeft(){
2     var a = document;
3     return a.documentElement.scrollLeft || a.body.scrollLeft;
4 }
获取页面可视宽

▷获取页面可视宽度

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

▷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);
}

▷获取页面scrollTop

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

▷获取页面可视高度

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

▷跨浏览器添加事件

function addEvt(oTarget,sEvtType,fnHandle){
if(!oTarget){return;}
if(oTarget.addEventListener){
oTarget.addEventListener(sEvtType,fnHandle,false);
}else if(oTarget.attachEvent){
oTarget.attachEvent("on" + sEvtType,fnHandle);
}else{
oTarget["on" + sEvtType] = fnHandle;
}
}

▷跨浏览器删除事件

function delEvt(oTarget,sEvtType,fnHandle){
if(!oTarget){return;}
if(oTarget.addEventListener){
oTarget.addEventListener(sEvtType,fnHandle,false);
}else if(oTarget.attachEvent){
oTarget.attachEvent("on" + sEvtType,fnHandle);
}else{
oTarget["on" + sEvtType] = fnHandle;
}
}

▷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;
}

▷随机数时间戳

function uniqueId(){
var a=Math.random,b=parseInt;
return Number(new Date()).toString()+b(10*a())+b(10*a())+b(10*a());
}

▷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("");
}

▷确认是否键盘有效输入值

function checkKey(iKey){
if(iKey == 32 || iKey == 229){return true;}/*空格和异常*/
if(iKey>47 && iKey < 58){return true;}/*数字*/
if(iKey>64 && iKey < 91){return true;}/*字母*/
if(iKey>95 && iKey < 108){return true;}/*数字键盘1*/
if(iKey>108 && iKey < 112){return true;}/*数字键盘2*/
if(iKey>185 && iKey < 193){return true;}/*符号1*/
if(iKey>218 && iKey < 223){return true;}/*符号2*/
return false;
}

▷获取网页被卷去的位置

function getScrollXY() {
return document.body.scrollTop ? {
x: document.body.scrollLeft,
y: document.body.scrollTop
}: {
x: document.documentElement.scrollLeft,
y: document.documentElement.scrollTop
}
}

▷另一种正则日期格式化函数+调用方法

Date.prototype.format = function(format){ //author: meizz
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"));

▷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() + 1
, 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;
}

▷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;
}

▷常用的正则表达式

//正整数
/^[0-9]*[1-9][0-9]*$/;
//负整数
/^-[0-9]*[1-9][0-9]*$/;
//正浮点数
/^(([0-9]+\.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*\.[0-9]+)|([0-9]*[1-9][0-9]*))$/;
//负浮点数
/^(-(([0-9]+\.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*\.[0-9]+)|([0-9]*[1-9][0-9]*)))$/;
//浮点数
/^(-?\d+)(\.\d+)?$/;
//email地址
/^[\w-]+(\.[\w-]+)*@[\w-]+(\.[\w-]+)+$/;
//url地址
/^[a-zA-z]+://(\w+(-\w+)*)(\.(\w+(-\w+)*))*(\?\S*)?$/;
//年/月/日（年-月-日、年.月.日）
/^(19|20)\d\d[- /.](0[1-9]|1[012])[- /.](0[1-9]|[12][0-9]|3[01])$/;
//匹配中文字符
/[\u4e00-\u9fa5]/;
//匹配帐号是否合法(字母开头，允许5-10字节，允许字母数字下划线)
/^[a-zA-Z][a-zA-Z0-9_]{4,9}$/;
//匹配空白行的正则表达式
/\n\s*\r/;
//匹配中国邮政编码
/[1-9]\d{5}(?!\d)/;
//匹配身份证
/\d{15}|\d{18}/;
//匹配国内电话号码
/(\d{3}-|\d{4}-)?(\d{8}|\d{7})?/;
//匹配IP地址
/((2[0-4]\d|25[0-5]|[01]?\d\d?)\.){3}(2[0-4]\d|25[0-5]|[01]?\d\d?)/;
//匹配首尾空白字符的正则表达式
/^\s*|\s*$/;
//匹配HTML标记的正则表达式
< (\S*?)[^>]*>.*?|< .*? />;

▷实现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');

▷获得URL中GET参数值

// 用法：如果地址是 test.htm?t1=1&t2=2&t3=3, 那么能取得：GET["t1"], GET["t2"], GET["t3"]
function get_get(){
querystr = window.location.href.split("?")
if(querystr[1]){
GETs = querystr[1].split("&")
GET =new Array()
for(i=0;i<GETs.length;i++){
tmp_arr = GETs[i].split("=")
key=tmp_arr[0]
GET[key] = tmp_arr[1]
}
}
return querystr[1];
}

▷实现全选通用方法

function checkall(form, prefix, checkall) {
var checkall = checkall ? checkall : 'chkall';
for(var i = 0; i < form.elements.length; i++) {
var e = form.elements[i];
if(e.type=="checkbox"){
e.checked = form.elements[checkall].checked;
}
}
}

▷实现全部取消选择通用方法

function uncheckAll(form) {
for (var i=0;i<form.elements.length;i++){
var e = form.elements[i];
if (e.name != 'chkall')
e.checked=!e.checked;
}
}

▷实现打开一个窗体通用方法

function openWindow(url,windowName,width,height){
var x = parseInt(screen.width / 2.0) - (width / 2.0);
var y = parseInt(screen.height / 2.0) - (height / 2.0);
var isMSIE= (navigator.appName == "Microsoft Internet Explorer");
if (isMSIE) {
var p = "resizable=1,location=no,scrollbars=no,width=";
p = p+width;
p = p+",height=";
p = p+height;
p = p+",left=";
p = p+x;
p = p+",top=";
p = p+y;
retval = window.open(url, windowName, p);
} else {
var win = window.open(url, "ZyiisPopup", "top=" + y + ",left=" + x + ",scrollbars=" + scrollbars + ",dialog=yes,modal=yes,width=" + width + ",height=" + height + ",resizable=no" );
eval("try { win.resizeTo(width, height); } catch(e) { }");
win.focus();
}
}

▷判断是否为客户端设备

function client(o){
var b = navigator.userAgent.toLowerCase();
var t = false;
if (o == 'isOP'){
t = b.indexOf('opera') > -1;
}
if (o == 'isIE'){
t = b.indexOf('msie') > -1;
}
if (o == 'isFF'){
t = b.indexOf('firefox') > -1;
}
return t;
}

▷获取单选按钮的值

function get_radio_value(field){
if(field&&field.length){
for(var i=0;i<field.length;i++){
if(field[i].checked){
return field[i].value;
}
}
}else {
return ;
}
}

▷获取复选框的值

function get_checkbox_value(field){
if(field&&field.length){
for(var i=0;i<field.length;i++){
if(field[i].checked && !field[i].disabled){
return field[i].value;
}
}
}else {
return;
}
}

▷判断是否为邮箱

function isEmail(str){
var re=/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/;
if (re.test(str) != true) {
return false;
}else{
return true;
}
}

▷判断是否有列表中的危险字符

function isValidReg(chars){
var re=/<|>|\[|\]|\{|\}|『|』|※|○|●|◎|§|△|▲|☆|★|◇|◆|□|▼|㊣|﹋|⊕|⊙|〒|ㄅ|ㄆ|ㄇ|ㄈ|ㄉ|ㄊ|ㄋ|ㄌ|ㄍ|ㄎ|ㄏ|ㄐ|ㄑ|ㄒ|ㄓ|ㄔ|ㄕ|ㄖ|ㄗ|ㄘ|ㄙ|ㄚ|ㄛ|ㄜ|ㄝ|ㄞ|ㄟ|ㄢ|ㄣ|ㄤ|ㄥ|ㄦ|ㄧ|ㄨ|ㄩ|■|▄|▆|\*|@|#|\^|\\/;
if (re.test( chars) == true) {
return false;
}else{
return true;
}
}

▷判断字符串是否大于规定的长度

function isValidLength(chars, len) {
if (chars.length < len) {
return false;
}
return true;
}

▷判断字符串是为网址不区分大小写

function isValidURL( chars ) {
var re=/^([hH][tT]{2}[pP]:\/\/|[hH][tT]{2}[pP][sS]:\/\/)(\S+\.\S+)$/;
if (!isNULL(chars)) {
chars = jsTrim(chars);
if (chars.match(re) == null)
return false;
else
return true;
}
return false;
}

▷判断字符串是否为小数

function isValidDecimal( chars ) {
var re=/^\d*\.?\d{1,2}$/;
if (chars.match(re) == null)
return false;
else
return true;
}

▷判断字符串是否为整数

function isNumber( chars ) {
var re=/^\d*$/;
if (chars.match(re) == null)
return false;
else
return true;
}

▷判断字符串是否为浮点数

function isFloat( str ) {
for(i=0;i<str.length;i++)  {
if ((str.charAt(i)<"0" || str.charAt(i)>"9")&& str.charAt(i) != '.'){
return false;
}
}
return true;
}

▷判断字符是否为A-Za-z英文字母

function isLetters( str ){
var re=/^[A-Za-z]+$/;
if (str.match(re) == null)
return false;
else
return true;
}

▷判断字符串是否邮政编码

function isValidPost( chars ) {
var re=/^\d{6}$/;
if (chars.match(re) == null)
return false;
else
return true;
}

▷判断字符是否空NULL

function isNULL( chars ) {
if (chars == null)
return true;
if (jsTrim(chars).length==0)
return true;
return false;
}

▷用正则表达式提取页面代码中所有网址

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

▷用正则表达式清除相同的数组(低效率)

1 Array.prototype.unique=function(){
2     return this.reverse().join(",").match(/([^,]+)(?!.*\1)/ig).reverse();
3 }

▷用正则表达式清除相同的数组(高效率)

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

▷用正则表达式按字母排序，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;
}

▷字符串反序

1 function IsReverse(text){
2     return text.split('').reverse().join('');
3 }

▷用正则表达式清除html代码中的脚本

1 function clear_script(){
2   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,"");
3 }

▷动态执行JavaScript脚本

function javascript(){
try{
eval(K1.value);
}catch(e){
alert(e.message);
}
}

▷动态执行VBScript脚本

function vbscript(){
try{
var script=document.getElementById("K1").value;
if(script.trim()=="")return;
window.execScript('On Error Resume Next \n'+script+'\n If Err.Number<>0 Then \n MsgBox "请输入正确的VBScript脚本!",48,"脚本错误!" \n End If',"vbscript")
}catch(e){
alert(e.message);
}
}

▷实现金额大写转换函数

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[i] = temp[i];
}
return value;
}

▷常用的正则表达式大收集

匹配中文字符的正则表达式： [\u4e00-\u9fa5]
匹配双字节字符（包括汉字在内）：[^\x00-\xff]
匹配空行的正则表达式：\n[\s| ]*\r
匹配 HTML 标记的正则表达式：<(.*)>.*<\/\1>|<(.*) \/>
匹配首尾空格的正则表达式：(^\s*)|(\s*$)
匹配 IP 地址的正则表达式：/(\d+)\.(\d+)\.(\d+)\.(\d+)/g
匹配 Email 地址的正则表达式：\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*
匹配网址 URL 的正则表达式：http://(/[\w-]+\.)+[\w-]+(/[\w- ./?%&=]*)?
sql 语句：^(select|drop|delete|create|update|insert).*$
非负整数：^\d+$
正整数：^[0-9]*[1-9][0-9]*$
非正整数：^((-\d+)|(0+))$
负整数：^-[0-9]*[1-9][0-9]*$
整数：^-?\d+$
非负浮点数：^\d+(\.\d+)?$
正浮点数：^((0-9)+\.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*\.[0-9]+)|([0-9]*[1-9][0-9]*))$
非正浮点数：^((-\d+\.\d+)?)|(0+(\.0+)?))$
英文字符串：^[A-Za-z]+$
英文大写串：^[A-Z]+$
英文小写串：^[a-z]+$
英文字符数字串：^[A-Za-z0-9]+$
英数字加下划线串：^\w+$
E-mail地址：^[\w-]+(\.[\w-]+)*@[\w-]+(\.[\w-]+)+$
URL：^[a-zA-Z]+://(\w+(-\w+)*)(\.(\w+(-\w+)*))*(\?\s*)?$ 或：^http:\/\/[A-Za-z0-9]+\.[A-Za-z0-9]+[\/=\?%\-&_~`@[\]\':+!]*([^<>\"\"])*$
邮政编码：^[1-9]\d{5}$
电话号码：^((\(\d{2,3}\))|(\d{3}\-))?(\(0\d{2,3}\)|0\d{2,3}-)?[1-9]\d{6,7}(\-\d{1,4})?$
手机号码：^((\(\d{2,3}\))|(\d{3}\-))?13\d{9}$
双字节字符（包括汉字在内）：^\x00-\xff
匹配首尾空格：(^\s*)|(\s*$)
匹配 HTML 标记：<(.*)>.*<\/\1>|<(.*) \/>
匹配空行：\n[\s| ]*\r
提取信息中的网络链接：(h|H)(r|R)(e|E)(f|F) *= *('|")?(\w|\\|\/|\.)+('|"| *|>)?
提取信息中的邮件地址：\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*
提取信息中的图片链接：(s|S)(r|R)(c|C) *= *('|")?(\w|\\|\/|\.)+('|"| *|>)?
提取信息中的 IP 地址：(\d+)\.(\d+)\.(\d+)\.(\d+)
提取信息中的中国手机号码：(86)*0*13\d{9}
提取信息中的中国固定电话号码：(\(\d{3,4}\)|\d{3,4}-|\s)?\d{8}
提取信息中的中国电话号码（包括移动和固定电话）：(\(\d{3,4}\)|\d{3,4}-|\s)?\d{7,14}
提取信息中的中国邮政编码：[1-9]{1}(\d+){5}
提取信息中的浮点数（即小数）：(-?\d*)\.?\d+
提取信息中的任何数字 ：(-?\d*)(\.\d+)?
IP：(\d+)\.(\d+)\.(\d+)\.(\d+)
电话区号：^0\d{2,3}$
腾讯 QQ 号：^[1-9]*[1-9][0-9]*$
帐号（字母开头，允许 5-16 字节，允许字母数字下划线）：^[a-zA-Z][a-zA-Z0-9_]{4,15}$
中文、英文、数字及下划线：^[\u4e00-\u9fa5_a-zA-Z0-9]+$

▷实现窗体改变事件resize的操作

(function(){
var fn = function(){
var w = document.documentElement ? document.documentElement.clientWidth : document.body.clientWidth
,r = 1255
,b = Element.extend(document.body)
,classname = b.className;
if(w < r){
//当窗体的宽度小于1255的时候执行相应的操作
}else{
//当窗体的宽度大于1255的时候执行相应的操作
}
}
if(window.addEventListener){
window.addEventListener('resize', function(){ fn(); });
}else if(window.attachEvent){
window.attachEvent('onresize', function(){ fn(); });
}
fn();
})();

▷用正则清除空格分左右

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

▷判断变量是否空值

/**
* 判断变量是否空值
* undefined, null, '', false, 0, [], {} 均返回true，否则返回false
*/
function empty(v){
switch (typeof v){
case 'undefined' : return true;
case 'string'    : if(trim(v).length == 0) return true; break;
case 'boolean'   : if(!v) return true; break;
case 'number'    : if(0 === v) return true; break;
case 'object'    :
if(null === v) return true;
if(undefined !== v.length && v.length==0) return true;
for(var k in v){return false;} return true;
break;
}
return false;
}

▷实现base64解码

function base64_decode(data){
var b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
var o1, o2, o3, h1, h2, h3, h4, bits, i = 0,ac = 0,dec = "",tmp_arr = [];
if (!data) { return data; }
data += '';
do {
h1 = b64.indexOf(data.charAt(i++));
h2 = b64.indexOf(data.charAt(i++));
h3 = b64.indexOf(data.charAt(i++));
h4 = b64.indexOf(data.charAt(i++));
bits = h1 << 18 | h2 << 12 | h3 << 6 | h4;
o1 = bits >> 16 & 0xff;
o2 = bits >> 8 & 0xff;
o3 = bits & 0xff;
if (h3 == 64) {
tmp_arr[ac++] = String.fromCharCode(o1);
} else if (h4 == 64) {
tmp_arr[ac++] = String.fromCharCode(o1, o2);
} else {
tmp_arr[ac++] = String.fromCharCode(o1, o2, o3);
}
} while (i < data.length);
dec = tmp_arr.join('');
dec = utf8_decode(dec);
return dec;
}

▷实现utf8解码

function utf8_decode(str_data){
var tmp_arr = [],i = 0,ac = 0,c1 = 0,c2 = 0,c3 = 0;str_data += '';
while (i < str_data.length) {
c1 = str_data.charCodeAt(i);
if (c1 < 128) {
tmp_arr[ac++] = String.fromCharCode(c1);
i++;
} else if (c1 > 191 && c1 < 224) {
c2 = str_data.charCodeAt(i + 1);
tmp_arr[ac++] = String.fromCharCode(((c1 & 31) << 6) | (c2 & 63));
i += 2;
} else {
c2 = str_data.charCodeAt(i + 1);
c3 = str_data.charCodeAt(i + 2);
tmp_arr[ac++] = String.fromCharCode(((c1 & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
i += 3;
}
}
return tmp_arr.join('');
}

▷获取窗体可见范围的宽与高

function getViewSize(){
var de=document.documentElement;
var db=document.body;
var viewW=de.clientWidth==0 ?  db.clientWidth : de.clientWidth;
var viewH=de.clientHeight==0 ?  db.clientHeight : de.clientHeight;
return Array(viewW ,viewH);
}

▷判断IE版本号

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 ;
}());

▷获取浏览器版本号

function browserVersion(types) {
var other = 1;
for (i in types) {
var v = types[i] ? types[i] : i;
if (USERAGENT.indexOf(v) != -1) {
var re = new RegExp(v + '(\\/|\\s|:)([\\d\\.]+)', 'ig');
var matches = re.exec(USERAGENT);
var ver = matches != null ? matches[2] : 0;
other = ver !== 0 && v != 'mozilla' ? 0 : other;
} else {
var ver = 0;
}
eval('BROWSER.' + i + '= ver');
}
BROWSER.other = other;
}

▷半角转换为全角函数

function ToDBC(str){
var result = '';
for(var i=0; i < str.length; i++){
code = str.charCodeAt(i);
if(code >= 33 && code <= 126){
result += String.fromCharCode(str.charCodeAt(i) + 65248);
}else if (code == 32){
result += String.fromCharCode(str.charCodeAt(i) + 12288 - 32);
}else{
result += str.charAt(i);
}
}
return result;
}

▷全角转换为半角函数

function ToCDB(str){
var result = '';
for(var i=0; i < str.length; i++){
code = str.charCodeAt(i);
if(code >= 65281 && code <= 65374){
result += String.fromCharCode(str.charCodeAt(i) - 65248);
}else if (code == 12288){
result += String.fromCharCode(str.charCodeAt(i) - 12288 + 32);
}else{
result += str.charAt(i);
}
}
return result;
}
内容来自用户分享和网络整理，不保证内容的准确性，如有侵权内容，可联系管理员处理 点击这里给我发消息
标签： 
相关文章推荐
新的分享
章节导航