表单判空

<script type="text/javascript">
  function check(){
console.log(1);
var name=document.getElementById('fir_name').value;
	  //var name = $("#fir_name").val();
if(name == null || name == "" ){
	    alert("姓名不能为空！");
	    return false;
	  }
		var type = $("#dd").val();
if(type == null || type == ""){
	    alert("邮箱（或）不能为空！");
	    return false;
	  }
		var url = $("#eeeeeee").val();
	  if( url == null || url == ""){
	    alert("问题描述或意见反馈不能为空！");
	    return false;
	  }
		return true;
  }
</script>