数组合并

[Sunny-117]

let arr1 = ["A1", "A2", "B1", "B2", "C1", "C2"]
let arr2 = ["A", "B", "C"];
// res=['A1', 'A2', 'A', 'B1', 'B2', 'B', 'C1', 'C2', 'C']

[veneno-o]

console.log([...new Set(arr1.concat(arr2))])

[kangkang123269]

1. set

let arr1 = [1, 2, 3];
let arr2 = [3, 4, 5];
let merged = [...new Set([...arr1,...arr2])];
console.log(merged); // 输出：[1 ,2 ,3 ,4 ，5]

2. filter

let arr1 = [1, 2, 3];
let arr2 = [3, 4, 5];
let merged = arr1.concat(arr2).filter((item,index,arr) => {
    return arr.indexOf(item) === index;
});
console.log(merged); // 输出：[1 ,2 ,3 ,4 ，5]