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<html>
<body>
<h1>JavaScript 数组</h1>
<p>map() 方法使用为每个数组元素调用函数的结果创建新数组。</p>
<p id="demo"></p>
<script>
const numbers = [4, 9, 16, 25];
document.getElementById("demo").innerHTML = numbers.map(Math.sqrt);
</script>
</body>
</html>