JavaScript es6 map 的相关内容

文章 2024-04-24 来自：开发者社区

js开发：请解释什么是ES6的Map和Set，以及它们与普通对象和数组的区别。

ES6的Map和Set是两种新的数据结构，它们与普通对象和数组有一些区别： Map是一种键值对集合，它的键可以是任意类型，而对象的键只能是字符串或符号。Map中的键值对是有序的，而对象的属性没有顺序。 Set是一种值的集合，它的值是唯一的，不会有重复的值。数组中可以有重复的值，但Set...

文章 2023-08-22 来自：开发者社区

JS 怎么理解ES6新增Set、Map两种数据结构?

一、前言Set是一种叫做集合的数据结构，Map是一种叫做字典的数据结构什么是集合？什么又是字典？集合是由一堆无序的、相关联的，且不重复的内存结构【数学中称为元素】组成的组合字典是一些元素的集合。每个元素有一个称作key 的域，不同元素的key 各不相同区别？共同点：集合、字典都可以存储不重复的值不同点：集合是以[值，值]的形式存储元素，字典是以[键，值]的形式存储下面对这两种数据结构进行详解二、....

文章 2023-07-12 来自：开发者社区

html标签的tabindex属性？css变量和js更改变量？ES6新增特性Map/WeakMap和Set/WeakSet

一省：HTML 20. html标签的tabindex属性？ tabindex 属性规定元素的 tab 键控制次序（当 tab 键用于导航时）。除此之外，大屏项目或者需要用遥控器操控的页面，tabindex都是必不可少的属性。<style> ul { display: flex; } li { width: 100px; height: 50...

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更新时间 2024-04-25 11:57:15

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