js ,jq 表单提交input，form表单

<form action="#" method="get" name="frm" id="frm" >
<input type="button" name="but" value="购买会员" style="background:#12ADFF;height:100px;width:85%;color:#FFF;font-size:36px;font-weight:bold;border-radius:5 px;" >
</form>
<script>
$("input[name=but]").click(function(){
//open_id=$("input[name=open_id]").val();
wangwang_no=$("input[name=wangwang_no]").val();
//vipmoney=$("input[name=vipmoney]").val();
//alert(vipmoney)
if(wangwang_no==''||wangwang_no==null){
alert("旺旺号不能为空！")
}else{
$("#frm").submit();
}
});
</script>