数组去重for循环和for循环嵌套

var arr = [1,9,8,8,7,2,5,3,3,3,2,3,1,4,5,444,55,22];
    console.log(arr);    
    function noRepeat(arr){
       for (var i = 0; i < arr.length; i++) {
           for (var j = 0; j < arr.length; j++) {
               if (arr[i] == arr[j] && i != j) { //将后面重复的数删掉
                  arr.splice(j, 1);
                }
           }
        }
        return arr;
    }
    var arr2  = noRepeat(arr);
    console.log(arr2);  
 利用单层for循环去重
    // 单层for循环去重
    // Array.splice() 方法用于添加或删除数组中的元素。会改变原数组
    let list = ['你是最棒的4', 8, 8, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 1, 2, 3, 4, 5, 6, 7, 8]
        let newlist5 = [];
        for (let i = 0; i < list.sort().length; i++) {
            if (list[i] == list[i + 1]) {
                list.splice(i, 1)
                i--
            }
        }
        console.log('newlist5', list);