Question

我正在尝试使用此说明从数组中删除元素：

使用循环移位数组值，如下所示。从index参数开始;对于小于长度的索引 - 将一个索引移向末尾将当前索引处的数组值设置为以下索引处的数组值

       Example: remove value at index 2 in List: a  b  c  d  e

                           0  1  2  3  4
             before loop:  a  b  c  d  e
       after loop pass 1:  a  b  d  d  e  (index 2 copies 'd' from index 3)
       after loop pass 2:  a  b  d  e  e  (index 3 copies 'e' from index 4)
       (loop ends)

将数组长度减少一个;在JavaScript中，这会从数组中删除最后一个元素。

为什么我的代码无效？

 this._data = ["a", "b", "c", "d", "e"];


length() {
        return this._data.length;
    }
    
remove(index) {

            if (index === this.length()) {
                delete this._data[this.length()];
            }
            
            
            while (index < this.length()) {
                this._data[index] = this._data[index + 1];
                index++;
            }
            delete this._data[this.length() - 1];
            
    }

Answer 1

你的代码很糟糕，你不能在没有属性的东西上使用属性.length你应该初始化对象并在（https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/length）

C#

或

var arr = ["a", "b", "c", "d", "e"];
arr.splice(2, 1); /* https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/splice */
/* ["a", "b", "d", "e"] */

从数组中删除

1 个答案: