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webpack搭建pixi.js 使用webpack搭建pixi.js开发环境

于小懒 人气:0

本文介绍怎么使用webpack搭建pixi.js游戏的开发环境，怎么配置babel将ES6+代码最终转换为ES5，怎么利用gulp将webpack和其他脚本粘合一起优化项目并最终发布项目。

前提

为了更容易理解，这里先贴出来项目最终的目录结构

.
├── dist
│  ├── index.html
│  ├── game.min.js
│  └── assets
│    └── bunny.png
├── src
│  ├── index.html
│  ├── assets
│  │  └── bunny.png
│  └── js
│    ├── main.js
│    └── scene.js
├── gulpfile.js
├── package.json
├── webpack.common.js
├── webpack.dev.js
└── webpack.prod.js

构建环境

初始化项目

运行git checkout init切换到init分支即可看到这一步的示例。

{
 "name": "pixi-webpack-demo",
 "version": "1.0.0",
 "description": "make pixi.js game with webpack and gulp",
 "main": "src/js/main.js",
 "keywords": ["pixi.js","webpack"],
 "author": "yulijun",
 "license": "MIT",
 "dependencies": {
  "pixi.js": "^5.2.1"
 }
}

创建文件src/index.html。

<html>
 <head>
  <title>pixi-webpack-demo</title>
 </head>
 <body>
 <canvas id="scene"></canvas>
  <!-- 注意这里的game.min.js文件，稍微在“引入webpack”步骤详细解释它-->
  <script type="text/javascript" src="game.min.js" charset="utf-8"></script>
 </body>
</html>

创建文件src/js/main.js，这个文件是游戏入口文件。

import * as PIXI from 'pixi.js'

const app = new PIXI.Application({
 width: 720,
 height: 1280,
 backgroundColor: 0x1099bb,
 view: document.querySelector('#scene')
});

const texture = PIXI.Texture.from('assets/bunny.png');
const bunny = new PIXI.Sprite(texture);
bunny.anchor.set(0.5);
bunny.x = 160
bunny.y = 160
app.stage.addChild(bunny);

app.ticker.add((delta) => {
 bunny.rotation -= 0.01 * delta;
});

引入webpack

运行git checkout webpack切换到webpack分支即可看到这一步的示例。

  1. 运行npm install --save-dev webpack webpack-dev-server webpack-cli webpack-merge安装依赖。
  2. 创建webpack.common.js文件，这个是webpack公共配置。
const path = require('path')
module.exports = {
 //游戏入口文件
 entry: ['./src/js/main.js'],
 output: {
  //js文件最终发布到哪个路径
  path: path.resolve(__dirname, 'dist'),
  
  //注意这个名字和刚才html里面的名字必须一致。
  //开发阶段webpack会自动处理这个文件让html引用到，虽然磁盘上不会有这个文件。
  //但是最终发布项目的时候会生成这个文件。
  filename: 'game.min.js',
 },
 target: 'web'
}

创建webpack.dev.js文件，这个配置文件用于开发调试阶段。

const path = require('path')
const merge = require('webpack-merge')
const common = require('./webpack.common.js')
module.exports = merge(common, {
 devtool: 'inline-source-map',
 mode: 'none',
 devServer: {
  //调试时候源代码的位置
  contentBase: path.join(__dirname, 'src'),
  port: 8080,
  host: '0.0.0.0',
  hot: true
 }
})

创建webpack.prod.js文件，这个配置文件用于发布项目(稍后在引入babel和发布项目步骤再详细介绍，这里暂时先贴出来)，这里配置了babel转码、tree shake和生成source map等。

const merge = require('webpack-merge')
const common = require('./webpack.common.js')
module.exports = merge(common, {
 'mode':'production',
 devtool: 'source-map',
 module: {
  rules: [{
   test: /\.js$/,
   exclude: /node_modules/,
   use: {
    loader: 'babel-loader',
    options: {
     presets: [
      ['@babel/preset-env', {
       'corejs': '3',
       'useBuiltIns': 'usage'
      }]
     ],
     plugins: ['@babel/plugin-transform-runtime']
    }
   }
  }]
 }
})

在package.json中的script配置节增加启动命令。

{
 "name": "pixi-webpack-demo",
 "version": "1.0.0",
 "description": "make pixi.js game with webpack and gulp",
 "main": "src/js/main.js",
 "keywords": ["pixi.js","webpack"],
 "author": "yulijun",
 "license": "MIT",
 "scripts": {
  "start": "webpack-dev-server --open 'google chrome' --config webpack.dev.js"
 },
 "devDependencies": {
  "webpack": "^4.41.5",
  "webpack-cli": "^3.3.10",
  "webpack-dev-server": "^3.10.3",
  "webpack-merge": "^4.2.2"
 },
 "dependencies": {
  "pixi.js": "^5.2.1"
 }
}

现已成功引入了webpack，运行npm start启动项目，会自动打开chrome浏览器，我们看到游戏已经跑起来了！尝试修改src/js/main.js文件，保存下，页面会自动刷新，我们的修改也已经能反映到页面上了！

构建项目

运行git checkout master切换到master分支即可看到这最终一步的示例。

const {
 src,
 dest,
 parallel
} = require('gulp')
const path = require('path')
const gulpif = require('gulp-if')
const imagemin = require('gulp-imagemin')
const webpack = require('webpack')
const webpack_config = require('./webpack.prod')

function copyAssets() {
 return src(['src/**/*', '!src/js/**'])
  .pipe(gulpif(
   file => path.extname(file.relative) === '.png',
   imagemin([imagemin.optipng({
    optimizationLevel: 3
   })], {
    verbose: true
   })))
  .pipe(dest('dist'))
}

function jsBundle(next) {
 const compiler = webpack(webpack_config)
 compiler.run((err, stats) => {
  if (err || stats.hasErrors()) {
   console.error(stats.toJson().errors)
  }
  next()
 })
}

exports.dist = parallel(copyAssets, jsBundle)

在package.json中script节加入构建相关命令，然后run npm build就能成功打包了！

{
 "name": "pixi-webpack-demo",
 "version": "1.0.0",
 "description": "make pixi.js game with webpack and gulp",
 "main": "src/js/main.js",
 "scripts": {
  "start": "webpack-dev-server --open 'google chrome' --config webpack.dev.js",
  "clean": "rimraf dist",
  "prebuild": "npm run clean",
  "build": "gulp dist"
 },
 "author": "yulijun",
 "keywords": ["pixi.js","webpack"],
 "license": "MIT",
 "devDependencies": {
  "@babel/core": "^7.8.4",
  "@babel/plugin-transform-runtime": "^7.8.3",
  "@babel/preset-env": "^7.8.4",
  "babel-loader": "^8.0.6",
  "rimraf": "^3.0.2",
  "gulp": "^4.0.0",
  "gulp-if": "^2.0.2",
  "gulp-imagemin": "^4.1.0",
  "webpack": "^4.41.5",
  "webpack-cli": "^3.3.10",
  "webpack-dev-server": "^3.10.3",
  "webpack-merge": "^4.2.2"
 },
 "dependencies": {
  "@babel/runtime": "^7.8.4",
  "core-js": "^3.6.4",
  "pixi.js": "^5.2.1"
 }
}

恭喜你，至此开发和构建环境已经全部完成，可尝试在源码中添加一些es6+语法，然后运行npm run build构建项目，最终打包好的项目会在dist目录中，js已经被混淆并合并为game.min.js，无用的引用通过tree shake已经被去掉了，包尺寸优化到了最小，而且所有es6+的语法均转换为es5以适应更多的浏览器。所有的图片也都进行了压缩处理。

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