思路：

新建一个空数组newArr                                 ========> var newArr = [];

设置for循环，获得数组arr的下标                 ========> for ( var i = 0 ; i < arr.length ;i++){

判断数组arr中下标为 i 的元素是否等于2      ========>         if ( arr[i] != 2) {

将arr中不等于2的元素输入进新数组newArr ========>                 newArr.push(arr[i]);

                                                                                                }

                                                                                        }

代码：

<script>
    var arr = [1,2,3,4,2,5,6,2,7,2];
    var newArr = [] ;
    for (var i = 0;i < arr.length;i++){
        if (arr[i] != 2) {
            newArr.push(arr[i]);
        }
    }
    console.log(newArr);
</script>

结果：

数组arr=[1,3,4,5,6,7]