使用jquery实现IE下按backspace相当于返回操作

$(function(){ 
function dokey(event){ 
var ele = event.target; 
var eleName = ele.nodeName; 
var flag = true; 
if(eleName=="INPUT"||eleName=="TEXTAREA"||eleName=="SELECT"){ 
var re = $(ele).attr("readonly"); 
if(re){ 
flag = true; 
}else{ 
flag = false; 
} 
} 
if(event.which==8&&flag){ 
event.preventDefault(); 
event.stopPropagation(); 
} 
} 
$(document).keypress(dokey).keydown(dokey); 
});