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>