二维数组去重

let arr = [
        [1, 45, 5, 4, 78, 48, 78, 98, 7, 120],
        [10, 41, 57, 4, 81, 48, 98, 58, 7, 120]
    ];
    // 接受 二维数组 转变 一维数组之后的值
    let arr1 = [];
    for (let i = 0; i < arr.length; i++) {
        arr1.push(...arr[i])

    }
    // 这个接收排除完成之后的值
    let arr2 = [];
    for (let j = 0; j < arr1.length; j++) {
        for (let c = j; c < arr1.length; c++) {
            if (arr2.indexOf(arr1[c]) == -1) {
                arr2.push(arr1[c])
            }
        }
    }
    console.log(arr1);
    console.log(arr2);