js 取数组一个元素 与剩余的每个元素作比较

    let arr1 = [1, 2, 3, 4, 2];
    for (let i = 0; i < arr1.length; i++) {
        let arr2 = [...arr1];
        arr2.splice(i, 1);
        test(arr1[i], arr2);
    }

    function test(ele, arr) {
        for (let i = 0; i < arr.length; i++) {
            if (ele == arr[i]) {
                console.log(123, arr[i])
            } else {
                console.log(234, arr[i])
            }
        }
    }