JavaScript 数组求差集

let arr1 = [1,2,3,4,5];
let arr2 = [4,5,6,7,8];

//数组求差集
function arrayDiff(arr1,arr2) {
    //先去重
    let arr1Unique = [...new Set(arr1)];
    let arr2UniqueSet = new Set(arr2);

    return arr1Unique.filter(item=>!(arr2UniqueSet.has(item)));
}

console.log(arrayDiff(arr1,arr2));
console.log(arrayDiff(arr2,arr1));