1.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>解构赋值</title>
</head>
<body>
</body>
<script>
// let arr = [10, 20, 30, 40];
// let [a, b, c, d] = [...arr];
// console.log(a, b, c, d)
let arr = [10, 20, 30, 40];
// 放回一个新数组
let [a, ...b] = [...arr];
console.log(a, b)
</script>
</html>
2.
