tryjsref_toprecision2 在线代码实例

实例代码( Tip: 登录后体验更佳 )
运行代码

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>W3Cschool教程(w3cschool.cn)</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 a = num.toPrecision();
    var b = num.toPrecision(2);
    var c = num.toPrecision(3);
    var d = num.toPrecision(10);
    var n=a + "<br>" + b + "<br>" + c + "<br>" + d;
    var x = document.getElementById("demo");
    x.innerHTML=n
}
</script>
</body>
</html>
 
 
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运行结果
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