搜索框 关键字不能为空

<SCRIPT LANGUAGE="JavaScript">
	<!--
	function post_search(){
	if(document.getElementById("search_keyword").value==''){
	alert("关键字不能为空");
	return false;
	}
	document.getElementById("form_search").submit();
	}
	//-->
	</SCRIPT>

转载于:https://www.cnblogs.com/ninelife/p/4253008.html