IE6内存泄漏的解决办法（一）

最新推荐文章于 2024-11-13 21:53:29 发布

最新推荐文章于 2024-11-13 21:53:29 发布 · 154 阅读

文章标签：

#IE #Microsoft

本文探讨了Internet Explorer中由于JS创建DOM对象时形成的循环引用所导致的内存泄漏问题，并提供了一种解决方法。通过在finally块中将DOM元素设置为null来避免内存泄漏。

IE下内存泄漏的官方说明http://msdn.microsoft.com/en-us/library/bb250448(VS.85).aspx

1. 对于使用JS创建DOM对象时产生的循环引用导致的内存泄漏问题

可以参考文章《Finally, the alternative fix for IE6's memory leak is available》

makeDOM : function (tagname, attributes, children) { try{ // If we were invoked with two arguments, the attributes argument is // an array or string; it should really be the children arguments. if (arguments.length == 2 && (attributes instanceof Array || typeof attributes == "string")) { children = attributes; attributes = null; } // Create the element var e = document.createElement(tagname); // Set attributes if (attributes) { for(var name in attributes) e[name]= attributes[name]; } // Add children, if any were specified. if (children != null) { if (children instanceof Array) { // If it really is an array for(var i = 0; i < children.length; i++) { // Loop through kids var child = children[i]; if (typeof child == "string") // Handle text nodes child = document.createTextNode(child); e.appendChild(child); // Assume anything else is a Node } } else if (typeof children == "string") // Handle single text child e.appendChild(document.createTextNode(children)); else e.appendChild(children); // Handle any other single child } // Finally, return the element. return e; }catch(err){ throw "Error happens when make DOM: " + "tag:" + tagname + " attr:" + attributes.toAttrString(); }finally{ e = null; } },//end makeDOM : function (tagname, attributes, children) {

其中需要注意的语句是

finally{ e = null; }

finally语句将会在return后，将e置为null