实例代码“Ctrl+/”提示“F11/ESC”全屏 返回 格式化 恢复 运行
​x
 
1
<!DOCTYPE html>
2
<html>
3
<body>
4
​
5
<p id="demo">Click the button to display the base-2 logarithm of E.</p>
6
​
7
<button onclick="myFunction()">Try it</button>
8
​
9
<script>
10
function myFunction()
11
{
12
document.getElementById("demo").innerHTML=Math.LOG2E;
13
}
14
</script>
15
​
16
</body>
17
</html>