<!DOCTYPE html>
<html>
<body>
<h1>JavaScript 数组</h1>
<h2>flatMap() 方法</h2>
<p id="demo"></p>
<script>
const myArr = [1, 2, 3, 4, 5,6];
const newArr = myArr.flatMap((x) => x * 2);
document.getElementById("demo").innerHTML = newArr;
</script>
</body>
</html>