验证码在IE中不刷新而谷歌等浏览器正常的解决方案

<script> 
//换验证码 
function changeimg(){ 
/* 
math.random范围是0-1 
*999变成0-999 
+3000 就是3000-3999 
*/ 
var time=Math.round(Math.random()*999)+3000; 
$('#captcha').attr('src','__APP__/Public/verify/time/'+time); 
} 
</script>