JS常用自定义函数总结

/**
* 字符串长度截取 params: str:字符串 length:长度
*/
function cutstr(str, length) {
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 params: url:域名
*/
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 为String 对象添加方法 trim（） 以此兼容不支持此方法的浏览器
*/
if (!String.prototype.trim) {
String.prototype.trim = function() {
var reExtraSpace = /^\s*(.*?)\s+$/;
return this.replace(reExtraSpace, "$1");
};
}/**
* 替换全部,多种方式的替换规则 为String 对象添加方法 replaceAll 兼容浏览器
*
* 第三参数 修饰符 描述 i 执行对大小写不敏感的匹配。 g 执行全局匹配（查找所有匹配而非在找到第一个匹配后停止）。 m 执行多行匹配。
*/
if (!String.prototype.replaceAll) {
String.prototype.replaceAll = function(s1, s2, type) {
return this.replace(new RegExp(s1, type), s2);
};
}/**
* 转义html标签
*/
function htmlEncode(text) {
return text.replace(/&/g, '&').replace(/\"/g, '"').replace(/</g,
'<').replace(/>/g, '>');
}/**
* 还原html标签
*/
function htmlDecode(text) {
return text.replace(/&/g, '&').replace(/"/g, '\"').replace(
/</g, '<').replace(/>/g, '>');
}/**
* 时间日期格式转换 (按需更改，是否调用原方法， 还是重写)
*/
if (!Date.prototye.format && !Date.prototype.Format) {
Date.prototype.Format = function(formatStr) {
var str = formatStr;
var Week = [ '日', '一', '二', '三', '四', '五', '六' ];
str = str.replace(/yyyy|YYYY/, this.getFullYear());
str = str.replace(/yy|YY/,
(this.getYear() % 100) > 9 ? (this.getYear() % 100).toString()
: '0' + (this.getYear() % 100));
str = str.replace(/MM/,
(this.getMonth() + 1) > 9 ? (this.getMonth() + 1).toString()
: '0' + (this.getMonth() + 1));
str = str.replace(/M/g, (this.getMonth() + 1));
str = str.replace(/w|W/g, Week[this.getDay()]);
str = str.replace(/dd|DD/, this.getDate() > 9 ? this.getDate()
.toString() : '0' + this.getDate());
str = str.replace(/d|D/g, this.getDate());
str = str.replace(/hh|HH/, this.getHours() > 9 ? this.getHours()
.toString() : '0' + this.getHours());
str = str.replace(/h|H/g, this.getHours());
str = str.replace(/mm/, this.getMinutes() > 9 ? this.getMinutes()
.toString() : '0' + this.getMinutes());
str = str.replace(/m/g, this.getMinutes());
str = str.replace(/ss|SS/, this.getSeconds() > 9 ? this.getSeconds()
.toString() : '0' + this.getSeconds());
str = str.replace(/s|S/g, this.getSeconds());
return str;
};
}/**
* 判断是否为数字类型
*/
function isDigit(value) {
var patrn = /^[0-9]*$/;
if (patrn.exec(value) == null || value == "") {
return false;
} else {
return true;
}
}/**
* 设置cookie值 escape(str) 对值进行编码 unescape(str)进行解码 (ECMAScript v3 反对使用该方法，应用使用
* decodeURI() 和 decodeURIComponent() 替代它。)
*
* param:
*
* name:名称
*
* value:名称对应值
*
* path:为了控制cookie可以访问的目录 例： path=/shop";就表示当前cookie仅能在shop目录下使用（url地址）。
*
* expires:过期时间 F * domain : 指定可访问cookie的主机名 域名
*/
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=sicd.com;";
}/**
* 获取cookie值 unescape()不推荐使用 用 decodeURI()
*
*/
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 设置背景图片缓存解决闪烁问题 （ie6默认背景图片不缓存）
*
* document.execCommand() 用法 想了解的童鞋请访问:
* http://www.cnblogs.com/sicd/p/4134641.html 记得点个赞哟 ^_^
*/
var ua = navigator.userAgent.toLowerCase();
var isIE6 = ua.indexOf("msie 6") > -1;
if (isIE6) {
try {
document.execCommand("BackgroundImageCache", false, true);
} catch (e) {
}
}/**
* 动态加载 CSS 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
*/
try {
if (typeof (eval('$')) == "function") {
} else {
function $(id) {
return !id ? null : document.getElementById(id);
}
}
} catch (e) {
function $(id) {
return !id ? null : document.getElementById(id);
}
}/**
* 返回浏览器版本
*
* 返回一个对象,对象属性：type，version
*/function getExplorerInfo() {
var explorer = window.navigator.userAgent.toLowerCase();
// ie
if (explorer.indexOf("msie") >= 0) {
var ver = explorer.match(/msie ([\d.]+)/)[1];
return {
type : "IE",
version : ver
};
}
// firefox
else if (explorer.indexOf("firefox") >= 0) {
var ver = explorer.match(/firefox\/([\d.]+)/)[1];
return {
type : "Firefox",
version : ver
};
}
// Chrome
else if (explorer.indexOf("chrome") >= 0) {
var ver = explorer.match(/chrome\/([\d.]+)/)[1];
return {
type : "Chrome",
version : ver
};
}
// Opera
else if (explorer.indexOf("opera") >= 0) {
var ver = explorer.match(/opera.([\d.]+)/)[1];
return {
type : "Opera",
version : ver
};
}
// Safari
else if (explorer.indexOf("Safari") >= 0) {
var ver = explorer.match(/version\/([\d.]+)/)[1];
return {
type : "Safari",
version : ver
};
}
}/**
* 显示元素 待验证 visibility hideen 会隐藏元素，但是会占用作用域
*/
// 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' : '';
}
}/**
* 与insertBefore方法（已存在）对应的insertAfter方法
*
*
*/
function insertAfter(newChild, refChild) {
var parElem = refChild.parentNode;
if (parElem.lastChild == refChild) {
refChild.appendChild(newChild);
} else {
parElem.insertBefore(newChild, refChild.nextSibling);
}
}/**
* 兼容浏览器绑定元素事件
*
* obj：元素
*
* evt:时间名称
*
* fn:触发函数
*
*/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
*
* .Open("GET",URL, false) true:异步；false:同步
*/
function getUrlState(URL) {
var suc = false;
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) {
suc = true;
} else {
suc = false;
}
} else {
suc = false;
}
}
return suc;
}/**
* 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
*/
function getCurrentPageUrl() {
var currentPageUrl = "";
if (typeof this.href === "undefined") {
currentPageUrl = document.location.toString().toLowerCase();
} else {
currentPageUrl = this.href.toString().toLowerCase();
}
return currentPageUrl;
}/**
* ip 转 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(selectAllBoxId, childBoxsId) {
var selectall = document.getElementById(selectAllBoxId);
var allbox = document.getElementsByName(childBoxsId);
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
*/
function isAppleMobileDevice() {
return (/iphone|ipod|ipad|Macintosh/i.test(navigator.userAgent
.toLowerCase()));
}/**
* 判断是否安卓移动设备访问
*/
function isAndroidMobileDevice() {
return (/android/i.test(navigator.userAgent.toLowerCase()));
}/**
* 判断是否Touch屏幕
*/
function isTouchScreen() {
return (('ontouchstart' in window) || window.DocumentTouch
&& document instanceof DocumentTouch);
}/**
* 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
*/
function isViewportOpen() {
return !!document.getElementById('wixMobileViewport');
}/**
* 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
*/
if(!String.prototype.startWith){
String.prototype.startWith = function (s) {
return this.indexOf(s) == 0;
};
}/**
* 判断是否以某个字符串结束
*/
if(!String.prototype.endWith){
String.prototype.endWith = function (s) {
var d = this.length - s.length;
return (d >= 0 && this.lastIndexOf(s) == d);
};
}/**
* 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(){
var a = document;
return a.documentElement.scrollLeft || a.body.scrollLeft;
}/**
* 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;
}/*****************************补充 ********************************************/
//删除cookies
function delCookie(name)
{
var exp = new Date();
exp.setTime(exp.getTime() - 1);
var cval=getCookie(name);
if(cval!=null)
document.cookie= name + "="+cval+";expires="+exp.toGMTString();

//电子邮箱判断
function testEmail(email){
var email_reg = new RegExp(/^\w+([-+.]\w+)*@\w+([-.]\w+)*.\w+([-.]\w+)*$/);
if(!email_reg.test(email)){
return "no";
}
return "yes";
} //手机号码
function testMobile(mobile){
var mobile_reg = new RegExp(/^0{0,1}1[0-9]{10}$/);
if(!mobile_reg.test(mobile)){
return "no";
}
return "yes";
} //身份证
function testIDCard(str){
var IDCardReg = new RegExp(/(^\d{15}$)|(^\d{17}([0-9]|X)$)/);
if(!IDCardReg.test(str)){
return "no";
}
return "yes";
} //定义一个函数，用来向一个元素添加指定的class属性值
/*
* 参数：
* obj 要添加class属性的元素
* cn 要添加的class值
*/
function addClass(obj,cn){
//检查
if(!hasClass(obj,cn))
obj.className+=" "+cn;
};
/*
* 判断一个元素中是否含有指定的class属性值
* 如果有该CLASS,则返回true,没有返回false
*/
function hasClass(obj,cn){
//var reg=/\bb2\b/;
var reg=new RegExp("\\b"+cn+"\\b");
//判断obj中有没有 cn class
return reg.test(obj.className);
};function removeClass(obj,cn){
//
var reg=new RegExp("\\b"+cn+"\\b");
//删除class
obj.className=obj.className.replace(reg,"");
};
/*
* toggleClass可以用来切换一个类
* 如果元素中具有该类，则删除
* 如果元素中没有该类，则添加
*/
function toggleClass(obj,cn){if(hasClass(obj,cn)){
removeClass(obj,cn);
}
else{
addClass(obj,cn);
}
};