get 方法：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>1.数组去重</title>
</head>
<body>
<script>
let arr = [1, 2, 2, 3, 4, 5, 5, 6, 7, 7,8,8,0,8,6,3,4,56,2];
let set = new Set(arr);
console.log(set);
</script>
</body>
</html>
打印输出：
