标签：ES6 arr Set ... item let 重交 new
原视频
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Set 实践</title>
</head>
<body>
<script>
let arr = [1,2,3,4,5,4,3,2,1];
//1. 数组去重
// let result = [...new Set(arr)];
// console.log(result);
//2. 交集
let arr2 = [4,5,6,5,6];
// let result = [...new Set(arr)].filter(item => {
// let s2 = new Set(arr2);// 4 5 6
// if(s2.has(item)){
// return true;
// }else{
// return false;
// }
// });
// let result = [...new Set(arr)].filter(item => new Set(arr2).has(item));
// console.log(result);
//3. 并集
// let union = [...new Set([...arr, ...arr2])];
// console.log(union);
//4. 差集
let diff = [...new Set(arr)].filter(item => !(new Set(arr2).has(item)));
console.log(diff);
</script>
</body>
</html>
标签：ES6,
arr,
Set,
...,
item,
let,
重交,
new
From： https://www.cnblogs.com/chuixulvcao/p/17181231.html