JS关闭浏览器标签
调用window.close函数几个，但是IE7,8下会弹出警告提示，用一下方法处理：
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window.open('', '_self', '');
http://stackoverflow.com/questions/57854/how-can-i-close-a-browser-window-without-receiving-the-do-you-want-to-close-thi
