案例：javascript案例     状态：可编辑再运行    进入竖版
 运行结果　
​x
 
1
<html>
2
<head>
3
<script type="text/javascript">
4
function setStyle(x)
5
{
6
document.getElementById(x).style.background="yellow"
7
}
8
</script>
9
</head>
10
<body>
11
​
12
First name: <input type="text" onfocus="setStyle(this.id)" id="fname">
13
<br />
14
Last name: <input type="text" onfocus="setStyle(this.id)" id="lname">
15
​
16
</body>
17
</html>
18
​