SOURCE

//数组去重
let arr = [4, 1, 3, 3, 2, 2];
let uniqueArr = [...new Set(arr)];
console.log(uniqueArr);

//合并数组
let array1 = [1, 2, 3, 4, 5, 6, 7]
let array2 = [5, 6, 7, 8]
let arrMerge = [...array1, ...array2]
console.log(arrMerge)

//取数组的交集，方法一：
let newArray = []
array1.forEach((item) => {
    let isHas = array2.some((item2) => {
        return item === item2
    })

    if (isHas) {
        newArray.push(item)
    }
})
console.log(newArray)

//取数组的交集，方法二：
let newArray2 = array1.filter(item => array2.some(item2 => item === item2))
console.log(newArray2)