JSFiddle - React, Tailwind, and code Playground

by sandfresh

HTML

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(runoob.com)</title>
</head>
<body>

<p>点击按钮获取数组元素的平方根。</p>
<button onclick="myFunction()">点我</button>
<p id="demo"></p>
 

</body>
</html>

JavaScript

var numbers = [4, 9, 16, 25,64,49,121,9,4,144,225];
function checkValue(age) {
    return age >= 4;
} 

function myFunction() {
    x = document.getElementById("demo")
    x.innerHTML = numbers.map(Math.sqrt).filter(checkValue).sort(function(a,b){return a-b});
}