1. JavaScript is a scripting language designed specifically for interacting with web pages. Its composition
ECMAScript (Core) DOM (Document Object Model) BOM (Browser Object Model)
1.1ECMAScript
ECMAScrip defined by ECMA-262 has no dependency on web browsers. ECMA-262 only defines the basis of this language and provides core language functions
ECMAScript is a scripting language standardized through ECMA-262. ECMA-262 specifies the language: syntax, types, statements, keywords, reserved words, operators, objects
1.2 DOM (Document Object Modle)
DOM is an application programming interface (API, Application Programming Interface) for XML but extended for HTML, providing methods and interfaces for accessing and operating web content
DOM maps the entire page into a multi-layer node structure. Each component in a page such as HTML or XML is a certain type of node, and these nodes contain different types of data.
1.3 BOM(Bower Object Modle)
Control parts other than the page displayed by the browser. BOM only handles browser windows and frames, providing methods and interfaces for interacting with the browser
2. <script> element<br /> 2.1 Quoting javascript files <br /> External reference javascript file: </script>
The page embeds javascript code
JavaScript code contained within the <script> element will be interpreted from top to bottom</script>
2.2 Attributes of <script> element</script>
Defer delay script: Tell the browser to download immediately. The script will be delayed until the entire page is parsed before execution. Defer only applies to externally introduced script files
Although the <script> tag is located within the <head> tag, demo.js will be delayed until the browser encounters </script>
es6数组怎么去掉重复并且重新排序May 05, 2022 pm 07:08 PM去掉重复并排序的方法：1、使用“Array.from(new Set(arr))”或者“[…new Set(arr)]”语句，去掉数组中的重复元素，返回去重后的新数组；2、利用sort()对去重数组进行排序，语法“去重数组.sort()”。
JavaScript的Symbol类型、隐藏属性及全局注册表详解Jun 02, 2022 am 11:50 AM本篇文章给大家带来了关于JavaScript的相关知识，其中主要介绍了关于Symbol类型、隐藏属性及全局注册表的相关问题，包括了Symbol类型的描述、Symbol不会隐式转字符串等问题，下面一起来看一下，希望对大家有帮助。
原来利用纯CSS也能实现文字轮播与图片轮播！Jun 10, 2022 pm 01:00 PM怎么制作文字轮播与图片轮播？大家第一想到的是不是利用js，其实利用纯CSS也能实现文字轮播与图片轮播，下面来看看实现方法，希望对大家有所帮助！
JavaScript对象的构造函数和new操作符（实例详解）May 10, 2022 pm 06:16 PM本篇文章给大家带来了关于JavaScript的相关知识，其中主要介绍了关于对象的构造函数和new操作符，构造函数是所有对象的成员方法中，最早被调用的那个，下面一起来看一下吧，希望对大家有帮助。
JavaScript面向对象详细解析之属性描述符May 27, 2022 pm 05:29 PM本篇文章给大家带来了关于JavaScript的相关知识，其中主要介绍了关于面向对象的相关问题，包括了属性描述符、数据描述符、存取描述符等等内容，下面一起来看一下，希望对大家有帮助。
javascript怎么移除元素点击事件Apr 11, 2022 pm 04:51 PM方法：1、利用“点击元素对象.unbind("click");”方法，该方法可以移除被选元素的事件处理程序；2、利用“点击元素对象.off("click");”方法，该方法可以移除通过on()方法添加的事件处理程序。
整理总结JavaScript常见的BOM操作Jun 01, 2022 am 11:43 AM本篇文章给大家带来了关于JavaScript的相关知识，其中主要介绍了关于BOM操作的相关问题，包括了window对象的常见事件、JavaScript执行机制等等相关内容，下面一起来看一下，希望对大家有帮助。
20+道必知必会的Vue面试题（附答案解析）Apr 06, 2021 am 09:41 AM本篇文章整理了20+Vue面试题分享给大家，同时附上答案解析。有一定的参考价值，有需要的朋友可以参考一下，希望对大家有所帮助。
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
Dreamweaver Mac version
Visual web development tools
MantisBT
Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.
Notepad++7.3.1
Easy-to-use and free code editor
SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.
SublimeText3 Mac version
God-level code editing software (SublimeText3)
