权威JavaScript 中的内存泄露模式

<html>

   	<body>

   	<script type="text/javascript">

   	document.write("circular references between JavaScript and DOM!");

   	var obj;

   	window.onload = function(){

		obj=document.getElementById("DivElement");

      	document.getElementById("DivElement").expandoProperty=obj;

      	obj.bigString=new Array(1000).join(new Array(2000).join("XXXXX"));

      	};

   	</script>

   	<div id="DivElement">Div Element</div>

   	</body>

   	</html>

<html>

	<head>

	<script type="text/javascript">

	document.write(" object s between JavaScript and DOM!");

	function myFunction(element)

	{

		this.elementReference = element;

		// This code forms a circular reference here

		//by DOM-->JS-->DOM

		element.expandoProperty = this;

	}

	function Leak() {

		//This code will leak

		new myFunction(document.getElementById("myDiv"));

	}

	</script>

	</head>

	<body onload="Leak()">

	<div id="myDiv"></div>

	</body>

	</html>

function parentFunction(paramA)

	{

  		var a = paramA;

  		function childFunction()

  		{

			return a + 2;

  		}

  		return childFunction();

	}

<html>

	<body>

	<script type="text/javascript">

	document.write("Closure Demo!!");

	window.onload=

	function closureDemoParentFunction(paramA)

	{

  		var a = paramA;

  		return function closureDemoInnerFunction (paramB)

  		{

   			alert( a +" "+ paramB);

  		};

	};

	var x = closureDemoParentFunction("outer x");

	x("inner x");

	</script>

	</body>

	</html>

<html>

	<body>

	<script type="text/javascript">

	document.write("Program to illustrate memory leak via closure");

	window.onload=function outerFunction(){

		var obj = document.getElementById("element");

		obj.onclick=function innerFunction(){

		alert("Hi! I will leak");

		};

		obj.bigString=new Array(1000).join(new Array(2000).join("XXXXX"));

		// This is used to make the leak significant

	};

	</script>

	<button id="element">Click Me</button>

	</body>

	</html>

<html>

	<body>

	<script type="text/javascript">

	document.write("Avoiding memory leak via closure by breaking the circular

  reference");

		window.onload=function outerFunction(){

		var obj = document.getElementById("element");

		obj.onclick=function innerFunction()

		{

			alert("Hi! I have avoided the leak");

			// Some logic here

		};

		obj.bigString=new Array(1000).join(new Array(2000).join("XXXXX"));

		obj = null; //This breaks the circular reference

		};

	</script>

	<button id="element">"Click Here"</button>

	</body>

	</html>

<html>

	<body>

	<script type="text/javascript">

	document.write("Avoiding a memory leak by adding another closure");

 	window.onload=function outerFunction(){

	var anotherObj = function innerFunction()

			 {

				// Some logic here

				alert("Hi! I have avoided the leak");

		 	 };

		 (function anotherInnerFunction(){

			var obj = document.getElementById("element");

			obj.onclick=anotherObj })();

		  };

	</script>

	<button id="element">"Click Here"</button>

	</body>

	</html>

<html>

	<head>

	<script type="text/javascript">

	document.write("Avoid leaks by avoiding closures!");

	window.onload=function()

	{

		var obj = document.getElementById("element");

		obj.onclick = doesNotLeak;

	}

	function doesNotLeak()

	{

		//Your Logic here

		alert("Hi! I have avoided the leak");

	}

</script>

	</head>

	<body>

	<button id="element">"Click Here"</button>

	</body>

	</html>

Abhijeet Bhattacharya 是 IBM 印度软件实验室的一名系统工程师。在过去三年中，他一直是 OS/2 IBM Web Browser 支持团队中的一员。他也具有系统管理领域的相关经验，并参与过 IBM Pegasus 开源创新项目。他目前工作的重点包括分布式计算和 SARPC。他拥有 Rajiv Gandhi Technical University 的工程学士学位。

Kiran Shivarama Sundar 是 IBM 印度软件实验室的一名系统工程师。在过去三年中，他一直是 OS/2 IBM Web Browser 支持团队中的一员。他同时也具有诸多其他项目的工作经验，包括为 Apache Tuscany Open Source Project 开发命令行工具以及为 IBM 的 EPCIS 团队开发 RFIDIC Installer。目前，Kiran 加入了 IBM WebSphere Adapters 支持团队，负责提供对 JMS 和 MQ 适配器的支持。他已成功获得了 Sun Certified Java Programmer、Sun Certified Web Component Developer 和 Sun Certified Business Component Developer 的认证。他目前所关注的领域包括 Java、J2EE、Web 服务和 SOA。他拥有 Visweshwaraya Technology University 的工程学士学位。