网页宽度高度理解
http://cache.baidu.com/c?m=9d78d513d9940be94fede52f534d803a5f11db357a8dc4523f8a9c12d52219564615fea6777c4d51c4c50b3640f9154bea876a25711e65e3ca9bcc1d81a6c1687ed27c702701864311d104acc85b27c63d9751e3a41ae4bde732e4fd939195&p=b462dc16d9c411a05bef91344b4080&user=baidu&fm=sc&query=Ext++clientWidth&qid=d3edf3bb0232b9d9&p1=7?
http://cache.baidu.com/c?m=9d78d513d9940be94fede5697c12c0171a43f1652ba7a0027ea48438e7732c375016e7ac56280704a2d20c6d16d93d4b9af421033d1767f7c5c7d20c9bf985295c953a7135599141658c52f8810032c157c106f4f74aa3e9b163d3f59095c25456ca55066d8087d11c5f4a&p=936e8e15d9c343e00dbe9b7e0a5088&user=baidu&fm=sc&query=Ext+%C6%C1%C4%BB%BF%ED%B6%C8+%B8%DF%B6%C8&qid=f4f4eeb0021f3e05&p1=1
