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2018-5-10 周周
收集了一些比較常用的JavaScript函數。
1、字符串長度截取函數
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;
}
}
returen strre+"...";
}
2、替換全部
String.prototype.replaceAll = function(s1,s2) {
return this.replace(new RegExp(s1,"gm"),s2);
}
3、清除空格
function trim = function() {
var reExtraSpace = /^\s*(.*?)\s+$/;
return this.replace(reExtraSpace,"$1");
}
4、清除左空格/右空格
function ltrim(s){
return s.replace(/^(\s*| *)/,"");
}
function rtrim(s) {
return s.replace(/(\s*| *)$/,"");
}
5、判斷是否以某個字符串開頭
String.prototype.startWith = function(s) {
return this.indexOf(s)==0;
}
6、判斷是否以某個字符串結束
String.prototype.endWith = function(s) {
var d = this.length - s.length;
return (d >= 0 && this.lastIndexOf(s)==d);
}
7、轉義HTML標簽
function HtmlEncode(text) {
return text.replace(/&/g,'&').replace(/\"/g,' " ').replace(/</g,'<').replace(/>/g,'>');
}
8、時間日期格式轉換
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(/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.getgetSeconds());
str = str.replace(/s|S/g,this.getSeconds());
return str;
}
9、判斷是否為數字類型
function isDigit (value){
var patrn = /^[0-9]*$/;
if (patrn.exec(value) == null || value=="" ) {
return false;
} else {
return true;
}
}
10、設置cookie
function setCookie(name,value,Hours){
var d =new Date();
var offset =8;
var utc = d.getTime()+(d.getTimezoneOffset()*60000);
var nd = utc+(3600000*offset);
var exp = new Date(nd);
exp.setTime(exp.getTime()+Hours*60*60*1000);
document.cookie = name+"="+escape(value)+";domain=360doc.com;"
}
獲取cookie值
function getCookie(name){
var arr = document.cookie.match(new RegExp("(^| )"+name+"=([^;]*)(;|$)"));
if (arr!=null){
return unescape(arr[2]);
}else {
return null;
}
}
11、加入收藏夾
function AddFavorite(sURL,sTitle) {
try{
window.external.addFavorite(sURL,sTitle);
}catch(e){
try{
window.sidebar.addPanel(sTitle,sURL,"");
}catch(e){
alert("加入收藏夾失敗，請使用Ctrl+D進行添加");
}
}
}
12、設為首頁
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("該操作被瀏覽器拒絕，如果想啟用該功能，請在地址欄內輸入about:config，然后將
項 signed.applets.codebase_principal_support 值該為true");
}
}
var prefs = Components.classes['@mozilla.org/preferences- service;1'].getService(Components.interfaces.nsIPrefBranch);
prefs.setCharPref('browser.startup.homepage', 'http://w3cboy.com');
}
}
13、加載樣式文件
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);
}
}
14、返回腳本內容
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;
}
15、清除腳本內容
function stripscript(s) {
return s.replace(/<script.*?>.*?<\/script>/ig, '');
}
16、動態加載腳本文件
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) {}
}
17、返回按ID檢索的元素對象
function $(id) {
return !id ? null : document.getElementById(id);
}
18、跨瀏覽器綁定事件
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;
}
}
19、跨瀏覽器刪除事件
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;
}
}
20、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;
};