勤于思考：IE10不支持检测IE6的代码

这句话

var isIE6 = isIE && ([/MSIE (\d)\.0/i.exec(navigator.userAgent)][0][1] == 6);

在IE6~9都没问题，就IE10下报错

改为

var isIE6 = isIE && ([/MSIE (\d+)\.0/i.exec(navigator.userAgent)][0][1] == 6);