<html>
<head>
<title>LUOyu</title>
<style type="text/css">
#x1 {
background:yellow;
}
</style>
<script type="text/javascript">
function a(){
alert("hello,world");//界面输出字符
confirm("a=");//输出消息
prompt("dfkl");//用户输入
var a=10;//定义
alert(typeof(a))//打印查看类型
}
</script>
</head>
<body>
<div id="x1">dsfdsf;ds</div>
<input type="button" value="click me" onclick="a()" />
</body>
</html>
