JavaScript进阶篇前端面试题的相关内容

文章 2024-07-02 来自：开发者社区

JS进阶篇（前端面试题整合）（三）

最近刷面试题遇到了一些比较有意思的题目，做个记录（题目均来源于牛客网，解析均是本人的理解，有任何问题欢迎在评论区指出） Q1：请问以下两次检测对象constructor是否拥有属性名1的结果分别是什么？ 1 in Object(1.0).constructor; Number[...

文章 2022-12-17 来自：开发者社区

Ajax 是什么? 如何创建一个Ajax？AJAX全称是Asychronous JavaScript And Xml（异步的 JavaScript 和 XML）它的作用是用来实现客户端与服务器端的异步通信效果，实现页面的局部刷新，早期的浏览器并不能原生支持ajax，可以使用隐藏帧（iframe）方式变相实现异步效果，后来的浏览器提供了对ajax的原生支持其主要通过XMLHttpRequest(标....

文章 2022-12-17 来自：开发者社区

JS进阶篇（前端面试题整合）（一）

js的垃圾回收机制是什么原理垃圾回收机制有两种方法第一种是标记清除法：当变量进入执行环境时,就标记这个变量为”进入环境”,当变量离开环境的时候,则将其标记为”离开环境”,垃圾收集器在运行的时候会给储存在内存中的所有变量都加上标记,然后它会去掉环境中的标量以及被环境中的变量引用的标记,而在此之后再被加上标记的变量将被视为准备删除的变量,原因是环境中的变量已经无法访问到这些变量了,最后,垃圾收集器完....

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更新时间 2024-07-03 09:13:12

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