<!DOCTYPE> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title></title> </head> <body> <img id="mainPic" src="http://img1c.xgo-img.com.cn/pics/1843/b1842753.jpg" /> <script> loadingImg(‘http://img1c.xgo-img.com.cn/pics/1843/b1842753.jpg‘,getWH); function getWH(){ set(this.width, this.height) } function loadingImg(url,fun){ var _Img = new Image(); _Img.src = url; /*判断是否已加载*/ (_Img.complete) ? fun : _Img.onload = fun; } function set(w,h){ console.log(w,h) } </script> </body> </html>
原文：http://www.cnblogs.com/dtdxrk/p/3885940.html