本文中，收集了一些比较常用的Javascript函数，希望对学习JS的朋友们有所帮助。
1. 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 + "..."
}
2. 替换全部
String.prototype.replaceAll = function(s1, s2) {
return this.replace(new RegExp(s1, "gm"), s2)
}
3. 清除空格
String.prototype.trim = function() {
var reExtraSpace = /^\s*(.*"$1")
}
4. 清除左空格/右空格
function ltrim(s){ return s.replace( /^(\s*| *)/, ""); }
function rtrim(s){ return s.replace( /(\s*| *)$/, ""); }
5. 判断是否以某个字符串开头
String.prototype.startWith = function (s) {
return this.indexOf(s) == 0
}
6. 判断是否以某个字符串结束
String.prototype.endWith = function (s) {
var d = this.length - s.length;
return (d >= 0 && this.lastIndexOf(s) == d)
}
7. 转义html标签
function HtmlEncode(text) {
return text.replace(/&/g, '&').replace(/\"/g, '"').replace(/</g, '<').replace(/>/g, '>')
}
8. 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 "htmlcode">
function isDigit(value) {
var patrn = /^[0-9]*$/;
if (patrn.exec(value) == null || value == "") {
return false
} else {
return true
}
}
10. 设置cookie值
function setCookie(name, value, Hours) {
var d = new Date();
var offset = 8;
var utc = d.getTime() + (d.getTimezoneOffset() * 60000);
var nd = utc + (3600000 * offset);
var exp = new Date(nd);
exp.setTime(exp.getTime() + Hours * 60 * 60 * 1000);
document.cookie = name + "=" + escape(value) + ";path=/;expires=" + exp.toGMTString() + ";domain=360doc.com;"
}
11. 获取cookie值
function getCookie(name) {
var arr = document.cookie.match(new RegExp("(^| )" + name + "=([^;]*)(;|$)"));
if (arr != null) return unescape(arr[2]);
return null
}
12. 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")
}
}
}
13. 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')
}
}
14. 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)
}
}
15. 返回脚本内容
function evalscript(s) {
if(s.indexOf('<script') == -1) return s;
var p = /<script[^\>]*"([^\>]*"[^\>]*"1\")"([\w\-]+")"htmlcode">
function stripscript(s) {
return s.replace(/<script.*"htmlcode">
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 "htmlcode">
function $(id) {
return !id "htmlcode">
function addEventSamp(obj,evt,fn){
if(!oTarget){return;}
if (obj.addEventListener) {
obj.addEventListener(evt, fn, false);
}else if(obj.attachEvent){
obj.attachEvent('on'+evt,fn);
}else{
oTarget["on" + sEvtType] = fn;
}
}
20. 跨浏览器删除事件
function delEvt(obj,evt,fn){
if(!obj){return;}
if(obj.addEventListener){
obj.addEventListener(evt,fn,false);
}else if(oTarget.attachEvent){
obj.attachEvent("on" + evt,fn);
}else{
obj["on" + evt] = fn;
}
}
21. 为元素添加on方法
Element.prototype.on = Element.prototype.addEventListener;
NodeList.prototype.on = function (event, fn) {、
[]['forEach'].call(this, function (el) {
el.on(event, fn);
});
return this;
};
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标签：
JavaScript,方法,函数
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