筛选

let numbers = [1,2,3,4]
let filteredNumbers = numbers.filter(number => number % 2 === 0);
console.log(filteredNumbers); // 输出

去重

const arr = [1, 2, 3, 4, 2, 3, 5];
const uniqueArr = Array.from(new Set(arr));
console.log(uniqueArr); // [1, 2, 3, 4, 5]