案例：javascript案例     状态：可编辑再运行    进入竖版
 运行结果　
​x
 
1
<!DOCTYPE html>
2
<html>
3
<head>
4
<script>
5
function myFunction()
6
{
7
document.getElementById("demo").innerHTML="My First JavaScript Function";
8
}
9
</script>
10
</head>
11
​
12
<body>
13
​
14
<h1>My Web Page</h1>
15
​
16
<p id="demo">A Paragraph.</p>
17
​
18
<button type="button" onclick="myFunction()">点击这里</button>
19
​
20
</body>
21
</html>
22
​