js代码

<script type="text/javascript">
document.getElementById("search").addEventListener("keyup",function(){
	if(this.value.length>0)
	{
		document.getElementById("cls").style.visibility="visible";
		document.getElementById("cls").onclick=function()
		{
			document.getElementById("search").value="";
		}
	}else
	{
		document.getElementById("cls").style.visibility="hidden";
	}
});
</script>