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 alertId()
5
{
6
var txt="Id: " + document.getElementById("myButton").id
7
txt=txt + ", type: " + document.getElementById("myButton").type
8
alert(txt)
9
document.getElementById("myButton").disabled=true
10
}
11
</script>
12
</head>
13
​
14
<body>
15
<form>
16
<button id="myButton" onClick="alertId()">请点击我！</button>
17
</form>
18
</body>
19
​
20
</html>
21
​