代码示例:(标识:js_array_flat)
<!DOCTYPE html>
<html>
<body>

<h1>JavaScript 数组</h1>

<h2>flat() 方法</h2>

<p id="demo"></p>

<script>
const myArr = [[1,2],[3,4],[5,6]];

const newArr = myArr.flat();
document.getElementById("demo").innerHTML = newArr;
</script>

</body>
</html>
运行结果: