已知如下数组： var arr = [ [1, 2, 2], [3, 4, 5, 5], [6, 7, 8, 9, [11, 12, [12, 13, [14] ] ] ], 10];

     var arr = [[1, 2, 2], [3, 4, 5, 5], [6, 7, 8, 9, [11, 12, [12, 13, [14]]]], 10];
    function flatAll(arr) {
        // toString方法将数组转化成字符串'1,2,2,3,4,5,5,6,7,8,9,11,12,12,13,14,10'
        // split(',')方法将字符串转换成数组["1", "2", "2", "3", "4", "5", "5", "6", "7", "8", "9", "11", "12", "12", "13", "14", "10"]
        // sort 方法排序
        // map(Number) 方法将每个元素映射成数字
        console.log(arr.toString().split(','))
        var arr2 = arr.toString().split(',').sort((a, b) => a - b).map(Number)
        // set结构去重
        // Array.from 方法通过类数组结构创建数组
        return Array.from(new Set(arr2));
    }
    console.log(flatAll(arr))

    var arr = [[1, 2, 2], [3, 4, 5, 5], [6, 7, 8, 9, [11, 12, [12, 13, [14]]]], 10];
    function flatAll(arr) {
        while (arr.find(item => typeof item === 'object')) {
            arr = arr.flat()
        }
        arr = arr.sort((x, y) => x - y)
        return Array.from(new Set(arr));
    }
    console.log(flatAll(arr));