code2021-l
Version:
前端自定义工具
37 lines (36 loc) • 1.08 kB
HTML
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>数组扁平化</title>
</head>
<body>
<!--
数组扁平化: 取出嵌套数组(多维)中的所有元素放到一个新数组(一维)中
如: [1, [3, [2, 4]]] ==> [1, 3, 2, 4]
-->
<!-- <script src="../node_modules/atguigu-utils/dist/atguigu-utils.js"></script> -->
<script src="../dist/190719-utils.js"></script>
<script>
function flatten2(array) {
let arr = [].concat(...array)
while(arr.some(item => Array.isArray(item))) { // arr中有元素是数组
arr = [].concat(...arr)
}
return arr
}
/*
[1, 3, [2, 4]]
*/
</script>
<script>
// [1] ---> [1, 3, 2, 4]
// [3, [2, 4]] --> [3] --> [3, 2, 4]
// [2, 4] --> [2, 4]
console.log(aUtils.flatten1([1, [3, [2, 4]]]))
console.log(aUtils.flatten2([1, [3, [2, 4]]]))
</script>
</body>
</html>