ie 下date对象

var t = '2014-02-26T21:18:02.497'
var a = t.replace(/(\d{4})-(\d{2})-(\d{2})T(.*)?\.(.*)/, "$1/$2/$3 $4")
new Date(a)

这样转换之后 ie就可以认识时间对象了,不然就是NAN