详解vue-cli 2.0配置文件(小结)

上次给大家分享的是用vue-cli快速搭建vue项目,虽然很省时间和精力,但想要真正搞明白,我们还需要对其原理一探究竟。

大家拿到一个项目,要快速上手,正确的思路是这样的:

首先,如果在项目有readme.md的情况下,大家要先读readme,项目的一些基本介绍,包括项目信息、运行的脚本、采用何种框架,以及项目维护者等信息通常都会有。一般在git上维护的项目都会有readme.md,不熟悉markdown语法的同学可以先了解下markdown入门。

第二步,要看package.json。现代的前端项目中通常都会有package.json文件。在package.json里,会介绍项目名称、版本、描述、作者、脚本、依赖包,对环境的要求,以及对浏览器要求。

{
 "name": "uccn",
 "version": "1.0.0",
 "description": "uccn3.0",
 "author": "v_yangtianjiao <v_yangtianjiao@baidu.com>",
 "private": true,
   // 这里的脚本是分析项目的主要入口
 "scripts": {
 "dev": "node build/dev-server.js",
 "start": "node build/dev-server.js",
 "build": "node build/build.js",
 "jsonp": "node build/jsonp-server.js"
 },
   // 项目依赖
 "dependencies": {
 "fetch-jsonp": "^1.1.3",
 "less": "^2.7.2",
 "less-loader": "^4.0.4",
 "stylus": "^0.54.5",
 "stylus-loader": "^3.0.1",
 "vue": "^2.4.2"
 },
 "devDependencies": {
 "autoprefixer": "^7.1.2",
 "babel-core": "^6.22.1",
 "babel-loader": "^7.1.1",
 "babel-plugin-component": "^0.10.1",
 "babel-plugin-transform-runtime": "^6.22.0",
 "babel-preset-env": "^1.3.2",
 "babel-preset-es2015": "^6.24.1",
 "babel-preset-stage-2": "^6.22.0",
 "babel-register": "^6.22.0",
 "chalk": "^2.0.1",
 "connect-history-api-fallback": "^1.3.0",
 "copy-webpack-plugin": "^4.0.1",
 "css-loader": "^0.28.0",
 "cssnano": "^3.10.0",
 "eventsource-polyfill": "^0.9.6",
 "express": "^4.14.1",
 "extract-text-webpack-plugin": "^2.0.0",
 "file-loader": "^0.11.1",
 "friendly-errors-webpack-plugin": "^1.1.3",
 "html-webpack-plugin": "^2.28.0",
 "http-proxy-middleware": "^0.17.3",
 "opn": "^5.1.0",
 "optimize-css-assets-webpack-plugin": "^2.0.0",
 "ora": "^1.2.0",
 "rimraf": "^2.6.0",
 "semver": "^5.3.0",
 "shelljs": "^0.7.6",
 "url-loader": "^0.5.8",
 "vue-loader": "^13.0.4",
 "vue-style-loader": "^3.0.1",
 "vue-template-compiler": "^2.4.2",
 "webpack": "^2.6.1",
 "webpack-bundle-analyzer": "^2.2.1",
 "webpack-dev-middleware": "^1.10.0",
 "webpack-hot-middleware": "^2.18.0",
 "webpack-merge": "^4.1.0"
 },
  // 对node版本的以及npm版本的要求
 "engines": {
 "node": ">= 4.0.0",
 "npm": ">= 3.0.0"
 },
   // 浏览器要求,vue项目不支持ie8,因为ie8是es3,尚没有Object.defineProperty属性
 "browserslist": [
 "> 1%",
 "last 2 versions",
 "not ie <= 8"
 ]
}

上面的package.json是从实际vue项目中摘出来的,大家从package.json中就会对项目有一个大概的了解,最主要的是脚本部分。通过npm的自动化任务,可以很方便的执行配置文件中的脚本。通过配置 "jsonp": "node build/jsonp-server.js",可以方便的使用npm run jsonp命令,代替node build/jsonp-server.js或者更复杂的一系列命令。详细的npm自动化命令可以移步npm 自动化。

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