随着浏览器安全性的提高，要实现图片预览也越来越困难。

不过群众的智慧是无限的，网上也有很多变通或先进的方法来实现。

在研究了各种预览方法后，作为总结，写了这个程序，跟大家一起分享。

上次写的简便无刷新文件上传系统最初的目的就是用来实现这个图片预览效果。

兼容：ie6/7/8, firefox 3.5.5

后台支持下还兼容：opera 10.10, safari 4.0.4, chrome 3.0

-With the improved browser security in order to achieve an image preview is also increasingly difficult. However, the wisdom of the masses is infinite, there are also many online alternative or advanced methods. After studying the various preview method, in summary, wrote this program to share with you. The last write simple non-refresh file upload system, the initial aim is to achieve this image preview. Compatibility: ie6/7/8, firefox 3.5.5 is also compatible with the background support: opera 10.10, safari 4.0.4, chrome 3.0