function format(string) {
    var args = arguments;
    var pattern = new RegExp("%([1-" + arguments.length + "])", "g");
    return String(string).replace(pattern, function(match, index) {
       return args[index];
    });
};

format("And the %1 want to know whose %2 you %3", "papers", "shirt", "wear");

	 var allowExt = ['jpg', 'gif', 'bmp', 'png', 'jpeg'];
	 var preivew = function(file, container){
		 try{
			var pic =  new Picture(file, container);
		 }catch(e){
			 alert(e);
		 }
	 }
	 //缩略图类定义
     var Picture  = function(file, container){
		 var height	= 0, 
			 widht 	= 0, 
			 ext	= '',
			 size	= 0,
			 name   = '',
			 path  	=  '';
		 var self 	= this;
		 if(file){ 
		     name = file.value;
			 if (window.navigator.userAgent.indexOf("MSIE")>=1){ 
				 file.select(); 
				 path = document.selection.createRange().text; 
			 }else if(window.navigator.userAgent.indexOf("Firefox")>=1){ 
				 if(file.files){ 
					 path =  file.files.item(0).getAsDataURL(); 
				 }else{
					 path = file.value;
				 }
			 } 
		 }else{
			 throw "bad file";
		 } 
 
 
		 ext = name.substr(name.lastIndexOf("."), name.length);
 
		 if(container.tagName.toLowerCase() != 'img'){
			 throw "container is not a valid img label";
			 container.visibility = 'hidden';
		 }
		 container.src = path;
		 container.alt = name;
		 container.style.visibility = 'visible';
		 height = container.height;
		 widht  = container.widht;
		 size   = container.fileSize;
 
 
		 this.get = function(name){
			 return self[name];
		 }
 
		 this.isValid = function(){
			 if(allowExt.indexOf(self.ext) !== -1){
				 throw 'the ext is not allowed to upload';
				 return false;
			 }
		 }
	 }

<form name="form" id="form" method="post" action="#">
 <input id="file" type="file" onchange="preivew(this, document.getElementById('img'));">
<img id="img"  style="visibility:hidden" height="100px" width="100px">
 
</form>

var scroll = document.getElementById('scroll');
var lis = scroll.getElementsByTagName('li');
var ml = 0;
var timer1 = setInterval(function() {
    var liHeight = lis[0].offsetHeight; //获取单元高度
    var timer2 = setInterval(function() {
        scroll.scrollTop = (++ml);
        if (ml == liHeight) {
            clearInterval(timer2);
            scroll.scrollTop = 0;
            ml = 0;
            lis[0].parentNode.appendChild(lis[0]);
        }
    },
    10);
},
2000);

#scroll {
	overflow:hidden;
	height:150px;
}

<ul id="scroll">
	<li>0</li>
	<li>1</li>
	<li>2</li>
	<li>3</li>
	<li>4</li>
	<li>5</li>
	<li>6</li>
	<li>7</li>
	<li>8</li>
	<li>9</li>
</ul>

function checkAll(form) {
    var c = 'checkBox';
    for (var e = 0; e < form.elements.length; e++) {
        var v = form.elements[e];
        v.checked = form.elements[c].checked;
    }
}

<form id="ads" method="post">
<input id="checkBox" onclick="checkAll(this.form)" name="checkBox" type="checkbox" value="checkbox" /><label for="checkBox">全选</label>
<input name="ids[]" type="checkbox" value="checkbox" />
<input name="ids[]" type="checkbox" value="checkbox" />
<input name="ids[]" type="checkbox" value="checkbox" />
<input name="ids[]" type="checkbox" value="checkbox" />
<input name="ids[]" type="checkbox" value="checkbox" />
</form>

setInterval("linkweb.innerHTML=new Date().toLocaleString()+' 星期'+'日一二三四五六'.charAt(new Date().getDay());", 1000);

#linkweb {
	font-size:14px;
	color:#F00;
}

<div id="linkweb "></div>

function showHide(objname) {
    var obj = document.getElementById(objname);
    if (obj.style.display == "none") obj.style.display = "block";
    else {
        obj.style.display = "none";
    }
}

dt {
	cursor:pointer;
}
dd {
	display:none;
}

<dl>
<dt onclick="showHide(&quot;items0&quot;)">标题一</dt>
<dd id="items0">
 
下级子类1
 
下级子类2
 
下级子类3
</dd>
<dt onclick="showHide(&quot;items1&quot;)">标题二</dt>
<dd id="items1">
 
下级子类1
 
下级子类2
 
下级子类3
</dd>
</dl>

var evalTime = function(func, times, obj, args) {
    times = times || 100000; //默认执行100000次
    obj = obj || null;
    args = args || [];
    var old = new Date();
    for (var i = 0; i < times; i++) {
        func.apply(obj, args);
    }
    var etime = (new Date()) - old;
    if (window.console && console.info) {
        console.info(etime);
    }
    document.writeln(func + "<p>函数执行" + times + "次消耗时间为：" + etime + "ms。</p>");
    return etime;
};

var temp = 0;
evalTime(function() {
    temp = new Date();
});
evalTime(function() {
    temp = new Date() * 1;
});
evalTime(function() {
    temp = new Date().valueOf();
});
evalTime(function() {
    temp = new Date().getTime();
});

var xml = window.ActiveXObject ? new ActiveXObject("Microsoft.XMLHTTP") : new XMLHttpRequest();

var xmlhttp = false;
//检查是否使用的是IE.
try {
	//如果javascript的版本大于5.
	xmlhttp = new ActiveXObject ("Msxml2.HMLHTTP");
	alert ("You are using Microsoft Internet Explorer6.0.");
} catch (e) {
	//如果不是,则使用老版本的ActiveX对象.
	try {
		//如果使用的是IE浏览器.
		xmlhttp = new ActiveXObject ("Microsoft.XMLHTTP");
		alert ("You are using Microsoft Internet Explorer5.0");
	} catch (E){
		//否则肯定使用的是非IE 浏览器.
		xmlhttp = false;
	}
}
//如果使用的是非IE 浏览器,则创建一个该对象的javascript实例.
if (!xmlhttp && typeof XMLHttpRequest != 'undefined'){
	xmlhttp = new XMLHttpRequest();
	alert ("You are not using Microsoft Internet Explorer.")
}

var gsAgent = navigator.userAgent.toLowerCase();
var gfAppVer = navigator.appVersion.toLowerCase();
var gIsOpera = gsAgent.indexOf("opera") > -1;
var gIsKHTML = gsAgent.indexOf("khtml") > -1 || gsAgent.indexOf("konqueror") > -1 || gsAgent.indexOf("applewebkit") > -1;
var gIsSafari = gsAgent.indexOf("applewebkit") > -1;
var gIsNS = !gIsIE && !gIsOpera && !gIsKHTML && (gsAgent.indexOf("mozilla") == 0) && (navigator.appName.toLowerCase() == "netscape");
var gIsIE = ( gsAgent.indexOf("compatible") > -1 && !gIsOpera ) || gsAgent.indexOf("msie") > -1;
var gIsFF = gsAgent.indexOf("gecko") > -1 && !gIsKHTML;
var gIsTT = gIsIE ? (gfAppVer.indexOf("tencenttraveler") != -1 ? 1 : 0) : 0;
//本来想写马桶的，不过最近她从良了，新版本用的是webkit引擎。
var gIsAgentErr = !( gIsOpera || gIsKHTML || gIsSafari || gIsIE || gIsTT || gIsFF || gIsNS );
document.write(gIsFF);

function getBrowser()
{
var Sys = {};
var ua = navigator.userAgent.toLowerCase();
var re =/(msie|firefox|chrome|opera|version).*?([\d.]+)/;
var m = ua.match(re);
Sys.browser = m[1].replace(/version/, "'safari");
Sys.ver = m[2];
return Sys;
}
var sys = getBrowser();
document.write(sys.browser + "===" + sys.ver);

var Prototype = {
  Version: '@@VERSION@@'
}

var Class = {
  create: function() {
    return function() {
      this.initialize.apply(this, arguments);
    }
  }
}

var Abstract = new Object();

Object.prototype.extend = function(object) {
  for (property in object) {
    this[property] = object[property];
  }
  return this;
}

     <input type="text" id="aaa" value="aaa"/>
     <input type="text" id="bbb" value="bbb"/>
     .................
     <script>
         var aaa = document.getElementById("aaa");
           var bbb = document.getElementById("bbb");
           aaa.showValue = function() {alert(this.value);}
           aaa.showValue2 = aaa.showValue.bind(bbb);
     </script>

Function.prototype.bind = function(object) {
  var method = this;
  return function() {
    method.apply(object, arguments);
  }
}

Number.prototype.toColorPart = function() {
  var digits = this.toString(16);
  if (this < 16) return '0' + digits;
  return digits;
}

var Try = {
  these: function() {
    var returnValue;
 
    for (var i = 0; i < arguments.length; i++) {
      var lambda = arguments[i];
      try {
        returnValue = lambda();
        break;
      } catch (e) {}
    }
 
    return returnValue;
  }
}

var PeriodicalExecuter = Class.create();
PeriodicalExecuter.prototype = {
  initialize: function(callback, frequency) {
    this.callback = callback;
    this.frequency = frequency;
    this.currentlyExecuting = false;
 
    this.registerCallback();
  },
 
  registerCallback: function() {
    setTimeout(this.onTimerEvent.bind(this), this.frequency  1000);
  },
 
  onTimerEvent: function() {
    if (!this.currentlyExecuting) {
      try {
        this.currentlyExecuting = true;
        this.callback();
      } finally {
        this.currentlyExecuting = false;
      }
    }
 
    this.registerCallback();
  }
}

function $() {
  var elements = new Array();
 
  for (var i = 0; i < arguments.length; i++) {
    var element = arguments[i];
    if (typeof element == 'string')
      element = document.getElementById(element);
 
    if (arguments.length == 1)
      return element;
 
    elements.push(element);
  }
 
  return elements;
}