tzpc.cn 
示例
复制代码 代码如下:
<script> <BR>var img = document.createElement('img'); <BR>img.src = "http://www.sinaimg.cn/rny/sinamail57/skins/110318/17/logo.jpg"; <BR>img.onload = function(){alert(this.width);}; <BR></script>
iframe,script必须添加到文档中后才执行回调。
<script> <BR>var img = document.createElement('img'); <BR>img.src = "http://www.sinaimg.cn/rny/sinamail57/skins/110318/17/logo.jpg"; <BR>img.onload = function(){alert(this.width);}; <BR></script>
iframe,script必须添加到文档中后才执行回调。
