2023-01-06 03:39:19 +08:00
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/**
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2022-12-12 21:13:49 +08:00
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* File: list.js
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* Created Time: 2022-12-12
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* Author: Justin (xiefahit@gmail.com)
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*/
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/* 初始化列表 */
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2023-10-09 18:20:42 +08:00
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const nums = [1, 3, 2, 5, 4];
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console.log(`列表 nums = ${nums}`);
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2022-12-12 21:13:49 +08:00
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/* 访问元素 */
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2023-10-09 18:20:42 +08:00
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const num = nums[1];
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2022-12-12 21:13:49 +08:00
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console.log(`访问索引 1 处的元素,得到 num = ${num}`);
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/* 更新元素 */
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2023-10-09 18:20:42 +08:00
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nums[1] = 0;
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console.log(`将索引 1 处的元素更新为 0 ,得到 nums = ${nums}`);
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2022-12-12 21:13:49 +08:00
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/* 清空列表 */
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2023-10-09 18:20:42 +08:00
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nums.length = 0;
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console.log(`清空列表后 nums = ${nums}`);
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2022-12-12 21:13:49 +08:00
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/* 尾部添加元素 */
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2023-10-09 18:20:42 +08:00
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nums.push(1);
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nums.push(3);
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nums.push(2);
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nums.push(5);
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nums.push(4);
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console.log(`添加元素后 nums = ${nums}`);
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2022-12-12 21:13:49 +08:00
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/* 中间插入元素 */
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2023-10-09 18:20:42 +08:00
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nums.splice(3, 0, 6);
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console.log(`在索引 3 处插入数字 6 ,得到 nums = ${nums}`);
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2022-12-12 21:13:49 +08:00
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/* 删除元素 */
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2023-10-09 18:20:42 +08:00
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nums.splice(3, 1);
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console.log(`删除索引 3 处的元素,得到 nums = ${nums}`);
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2022-12-12 21:13:49 +08:00
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/* 通过索引遍历列表 */
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let count = 0;
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2023-10-09 18:20:42 +08:00
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for (let i = 0; i < nums.length; i++) {
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2023-11-14 21:27:35 +08:00
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count += nums[i];
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2022-12-12 21:13:49 +08:00
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}
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/* 直接遍历列表元素 */
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count = 0;
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2023-11-14 21:27:35 +08:00
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for (const x of nums) {
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count += x;
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2022-12-12 21:13:49 +08:00
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}
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/* 拼接两个列表 */
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2023-10-09 18:20:42 +08:00
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const nums1 = [6, 8, 7, 10, 9];
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nums.push(...nums1);
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console.log(`将列表 nums1 拼接到 nums 之后,得到 nums = ${nums}`);
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2022-12-12 21:13:49 +08:00
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/* 排序列表 */
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2023-10-09 18:20:42 +08:00
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nums.sort((a, b) => a - b);
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console.log(`排序列表后 nums = ${nums}`);
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