一、简介
Vue.js 是什么
Vue.js(读音 /vjuː/, 类似于 view) 是一套构建用户界面的 渐进式框架。与其他重量级框架不同的是,Vue 采用自底向上增量开发的设计。Vue 的核心库只关注视图层,并且非常容易学习,非常容易与其它库或已有项目整合。另一方面,Vue 完全有能力驱动采用单文件组件和Vue生态系统支持的库开发的复杂单页应用。
Vue.js 的目标是通过尽可能简单的 API 实现响应的数据绑定和组合的视图组件。
Vue.js是一个MVVM模式的框架,如果读者有angular经验,一定能够很快入门Vue的
vue.js的特点:
易用: 已经会了HTML,CSS,JavaScript?即刻阅读指南即可开始构建应用!
灵活: 简单小巧的核心,渐进式技术栈,足以应付任何规模的应用。
高效: 16kb min+gzip 的运行大小,超快虚拟 DOM ,最省心的优化
二、环境搭建
vue推荐开发环境:
Node.js: javascript运行环境(runtime),不同系统直接运行各种编程语言
npm: Nodejs下的包管理器
webpack: 它主要的用途是通过 CommonJS 的语法把所有浏览器端需要发布的静态资源做相应的准备,比如资源的合并和打包。
vue-cli: 用户生成Vue工程模板
开始安装:
1.nodejs由于我已经安装好了,跳过
2.webpack
npm install webpack -g
3.安装vue脚手架
npm install vue-cli -g
测试:
在硬盘上找一个文件夹放工程用的,在终端中进入该目录
cd 目录路径
根据模板创建项目
vue init webpack-simple 工程名字<工程名字不能用中文>或者创建 vue1.0 的项目vue init webpack-simple#1.0 工程名字<工程名字不能用中文>
工程目录如图所示:
安装项目依赖:
安装 vue 路由模块vue-router和网络请求模块vue-resource
进入该项目执行
npm install vue-router vue-resource --save
启动项目
npm run dev
运行就报错
'NODE_ENV' 不是内部或外部命令,也不是可运行的程序或批处理文件。npm ERR! Windows_NT 6.1.7601npm ERR! argv "D:\\nodejs\\node.exe" "D:\\nodejs\\node_modules\\npm\\bin\\npm-cli.js" "start"npm ERR! node v4.0.0-rc.5npm ERR! npm v2.14.2npm ERR! code ELIFECYCLEnpm ERR! yy-ydh-web@1.0.7 start: `npm run clear&& NODE_ENV=development && webpack-dev-server --host 0.0.0.0 --devtool eval --progress --color --profile`npm ERR! Exit status 1npm ERR!npm ERR! Failed at the yy-ydh-web@1.0.7 start script 'npm run clear&& NODE_ENV=development && webpack-dev-server --host0.0.0.0 --devtool eval --progress --color --profile'.npm ERR! This is most likely a problem with the yy-ydh-web package,npm ERR! not with npm itself.npm ERR! Tell the author that this fails on your system:npm ERR! npm run clear&& NODE_ENV=development && webpack-dev-server --host 0.0.0.0 --devtool eval --progress --color --profilenpm ERR! You can get their info via:npm ERR! npm owner ls yy-ydh-webnpm ERR! There is likely additional logging output above.npm ERR! Please include the following file with any support request:npm ERR! D:\workspace\node_modules\yy-ydh-web\npm-debug.log
这是windows不支持NODE_ENV=development的设置方式
解决方法:
●安装across-env: npm install cross-env --save-dev
●在NODE_ENV=xxxxxxx前面添加cross-env就可以了。
运行还是报错:
找不到webpack这个模块
module.js:457 throw err; ^Error: Cannot find module 'webpack' at Function.Module._resolveFilename (module.js:455:15) at Function.Module._load (module.js:403:25) at Module.require (module.js:483:17) at require (internal/module.js:20:19) at Object.<anonymous> (D:\vue_work\fendo\webpack.config.js:2:15) at Module._compile (module.js:556:32) at Object.Module._extensions..js (module.js:565:10) at Module.load (module.js:473:32) at tryModuleLoad (module.js:432:12) at Function.Module._load (module.js:424:3)
安装该模块:
安装该模块:
ccnpm install 模块名 --save-dev(关于环境的,表现为npm run dev 启动不了)cnpm install 模块名 --save(关于项目的,比如main.js,表现为npm run dev 成功之后控制台报错)比如escape-string-regexp、strip-ansi、has-ansi、is-finite、emojis-list
安装好后运行又报这个模块的错:
Error: Cannot find module 'bl' at Function.Module._resolveFilename (module.js:455:15) at Function.Module._load (module.js:403:25) at Module.require (module.js:483:17) at require (internal/module.js:20:19) at Object.<anonymous> (C:\Users\fendo\AppData\Roaming\npm\node_modules\npm\node_modules\request\request.js:9:10) at Module._compile (module.js:556:32) at Object.Module._extensions..js (module.js:565:10) at Module.load (module.js:473:32) at tryModuleLoad (module.js:432:12) at Function.Module._load (module.js:424:3)
接着继续安装
cnpm install bl --save-dev
再运行:
npm run dev
访问: http://localhost:8080/ 运行成功

JavaScript's application in the real world includes front-end and back-end development. 1) Display front-end applications by building a TODO list application, involving DOM operations and event processing. 2) Build RESTfulAPI through Node.js and Express to demonstrate back-end applications.

The main uses of JavaScript in web development include client interaction, form verification and asynchronous communication. 1) Dynamic content update and user interaction through DOM operations; 2) Client verification is carried out before the user submits data to improve the user experience; 3) Refreshless communication with the server is achieved through AJAX technology.

Understanding how JavaScript engine works internally is important to developers because it helps write more efficient code and understand performance bottlenecks and optimization strategies. 1) The engine's workflow includes three stages: parsing, compiling and execution; 2) During the execution process, the engine will perform dynamic optimization, such as inline cache and hidden classes; 3) Best practices include avoiding global variables, optimizing loops, using const and lets, and avoiding excessive use of closures.

Python is more suitable for beginners, with a smooth learning curve and concise syntax; JavaScript is suitable for front-end development, with a steep learning curve and flexible syntax. 1. Python syntax is intuitive and suitable for data science and back-end development. 2. JavaScript is flexible and widely used in front-end and server-side programming.

Python and JavaScript have their own advantages and disadvantages in terms of community, libraries and resources. 1) The Python community is friendly and suitable for beginners, but the front-end development resources are not as rich as JavaScript. 2) Python is powerful in data science and machine learning libraries, while JavaScript is better in front-end development libraries and frameworks. 3) Both have rich learning resources, but Python is suitable for starting with official documents, while JavaScript is better with MDNWebDocs. The choice should be based on project needs and personal interests.

The shift from C/C to JavaScript requires adapting to dynamic typing, garbage collection and asynchronous programming. 1) C/C is a statically typed language that requires manual memory management, while JavaScript is dynamically typed and garbage collection is automatically processed. 2) C/C needs to be compiled into machine code, while JavaScript is an interpreted language. 3) JavaScript introduces concepts such as closures, prototype chains and Promise, which enhances flexibility and asynchronous programming capabilities.

Different JavaScript engines have different effects when parsing and executing JavaScript code, because the implementation principles and optimization strategies of each engine differ. 1. Lexical analysis: convert source code into lexical unit. 2. Grammar analysis: Generate an abstract syntax tree. 3. Optimization and compilation: Generate machine code through the JIT compiler. 4. Execute: Run the machine code. V8 engine optimizes through instant compilation and hidden class, SpiderMonkey uses a type inference system, resulting in different performance performance on the same code.

JavaScript's applications in the real world include server-side programming, mobile application development and Internet of Things control: 1. Server-side programming is realized through Node.js, suitable for high concurrent request processing. 2. Mobile application development is carried out through ReactNative and supports cross-platform deployment. 3. Used for IoT device control through Johnny-Five library, suitable for hardware interaction.


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