获取url里的参数

<script type="text/javascript">
function QueryString(item){
var sValue=location.search.match(new RegExp("[\?\&]"+item+"=([^\&]*)(\&?)","i")) ;
return sValue?sValue[1]:sValue ;
}

</script>

//get 

var uid=QueryString('uid');
$('#cu_uid').val(uid);