菜鸟教程在线编辑器

左右布局

AI 编程工具

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(runoob.com)</title>
</head>
<body>
​
<p id="demo">单击按钮来显示格式化的数字。</p>
<button onclick="myFunction()">点我</button>
<script>
function myFunction(){
    var num = new Number(13.3714);
    var n = num.toPrecision(2);
    var x = document.getElementById("demo");
    x.innerHTML=n
}
</script>
​
</body>
</html>