菜鸟教程在线编辑器

AI 编程工具

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

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

<script>
const arr1 = [1, 2, [3], [4, 5], 6, []];
 
const flattened = arr1.flatMap(num => num);
 
document.getElementById("demo").innerHTML = flattened;
</script>

</body>
</html>
              