vite.config.js怎么配置

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1 如何创建vite项目？

step 1 : npm init vite@latest yarn create vitestep2 :npm init vite@latest my-vue-app --template vue npm 7+, 需要额外的双横线：npm init vite@latest my-vue-app -- --template vue # yarnyarn create vite my-vue-app --template vue

2 如何让vite项目启动时自动打开浏览器？

注：vite针对开发环境，打包环境和预览环境分别定义了三个选项： server、build、preview。 开发环境server类似于webpack中的devServer。

export default ({mode})=>{return defineConfig({  server:{    open:true, //vite项目启动时自动打开浏览器  },}}

3vite启动默认端口为3000？如何更改默认端口？

export default ({mode})=>{return defineConfig({  server:{    port:8080, //vite项目启动时自定义端口  },}}

4 vite如何设置热更新？

vite默认开发环境关闭了热更新。代码更改需要手动更新，设置更改代码自动刷新页面需要设置hmr：true

export default ({mode})=>{return defineConfig({  server:{    hmr:true, //开启热更新  },}}

5vite中如何配置别名路径？

设置resolver选项

import { resolve } from 'path'; export default ({mode})=>{return defineConfig({  resolve:{      alias:{        "@":resolve(__dirname,"class="lazy" data-src"),        "@c":resolve(__dirname,"class="lazy" data-src/components"),      }  },}}

6 vite中如何设置便捷图片路径引用？

比如图片资源都在class="lazy" data-src/assets/image目录下，不想在项目中每次都通过require("../assets/image/1.jpg")这样写一长串去引用。能否通过 类似nuxt中的快速引用？

  <img class="lazy" data-src="/images/1.png" alt="" />  这里直接引用

export default ({mode})=>{return defineConfig({  resolve:{      alias:{      "/images":"class="lazy" data-src/assets/images/"      //这里不能通过path模块解析路径的写法      }  },}}

7如何把vite打包以后的js,css和img资源分别分门别类在js/css/img文件夹中?

//由于是处理打包以后的资源，所以需要配置build选项export default ({mode})=>{return defineConfig({   build:{    assetsDir:"static",    rollupOptions:{            input:{        index:resolve(__dirname,"index.html"),        project:resolve(__dirname,"project.html")      },      output:{        chunkFileNames:'static/js/[name]-[hash].js',        entryFileNames:"static/js/[name]-[hash].js",        assetFileNames:"static/[ext]/name-[hash].[ext]"      }    },  }, }}

8 如何通过vite给项目配置多个环境？

以开发、测试和生产环境为例

（1）在项目根目录下分别新建.env.development,.env.test,.env.production文件

//.env.devopment文件内容NODE_ENV="development"VITE_APP_BASEAPI="https://www.dev.com"//.env.test文件内容NODE_ENV="test"VITE_APP_BASEAPI="https://www.test.com"//.env.production文件内容NODE_ENV="production"VITE_APP_BASEAPI="https://www.production.com"

(2) package.json文件做如下修改

 "scripts": {    "dev": "vite --mode development",    "build": "vite build --mode production",    "test": "vite build --mode test",    "preview": "vite preview"  },

（3）项目中通过Import.meta.env.VITE_APP_BASEAPI来获取对应环境的值

<template>  <div>    <Item></Item>  </div> </template><script setup>    import { defineComponent, onMounted, ref } from 'vue'    import Item from "@c/item.vue"    console.log("env", import.meta.env.VITE_APP_BASEAPI)    console.log("可选链", obj?.gender || "male")})</script>

9 vite中如何配置多入口，进行多页面开发？

step1：在根目录新建一个入口页面以project.html为例，同时在根目录下新建一个project文件夹，在此文件夹新建一个main.js,App.vue

step2:vite.config.js作如下修改：

import { defineConfig,loadEnv  } from 'vite'import {resolve} from "path";export default ({mode})=>{return defineConfig({  build:{    rollupOptions:{      input:{        index:resolve(__dirname,"index.html"),        project:resolve(__dirname,"project.html")      },     //output:{       // chunkFileNames:'static/js/[name]-[hash].js',        //entryFileNames:"static/js/[name]-[hash].js",        //assetFileNames:"static/[ext]/name-[hash].[ext]"      }    },  },  plugins: [    vue(),  ]})}

 step3:vite run dev 启动以后在url加上project.html查看project项目 localhost:3000/project.html

10 如何设置开启生产打包分析文件大小功能？类似webpack-bundle-analyzer?

//1 安装rollup-plugin-visualizer 插件npm i rollup-plugin-visualizer//2 vite.config.js中引入插件import {visualizer} from "rollup-plugin-visualizer"export default ({mode:string})=>{   const plugins=[     vue(),    AutoImport({      resolvers: [ElementPlusResolver()],    }),    Components({      resolvers: [ElementPlusResolver()]    }),    visualizer({        open:true,  //注意这里要设置为true，否则无效        gzipSize:true,        brotliSize:true     })  ]; } return  defineConfig({                        resolve:{              alias:{                "@":resolve(__dirname,"class="lazy" data-src"),                "/images":"class="lazy" data-src/assets/images/"              }            },            plugins          })

11 如何解决require is not define报错的的问题？ 场景： 比如我们assets文件夹下有一个静态的json：

        list:[            {                shop_id:1,                shop_name:'搜猎人艺术生活',                products:[                    {                        pro_id:101,                        text:'洗面奶洗面奶洗面奶洗面奶洗面奶洗面奶洗面奶洗面奶',                        price:480,                        num:1,                        img:require("./images/1.png"),                        sum:480,                        checked:false//商品选中状态                    },                    {                        pro_id:102,                        text:'花露水花露水花露水花露水花露水花露水花露水花露水',                        price:680,                        num:1,                        img:require('./images/2.png'),                        sum:680,                        checked:false                    },                    {                        pro_id:103,                        text:'燕麦片燕麦片燕麦片燕麦片燕麦片燕麦片燕麦片燕麦片',                        price:380,                        num:1,                        img:require('./images/3.png'),                        sum:380,                        checked:false                    }                ],                check:false,//店铺选中状态                choose:0,//商品选中个数            },            {                shop_id:2,                shop_name:'卷卷旗舰店',                products:[                    {                        pro_id:201,                        text:'剃须刀剃须刀剃须刀剃须刀剃须刀剃须刀剃须刀剃须刀',                        price:580,                        num:1,                        img:require('./images/4.png'),                        sum:580,                        checked:false                    },                    {                        pro_id:202,                        text:'卫生纸卫生纸卫生纸卫生纸卫生纸卫生纸卫生纸卫生纸',                        price:780,                        num:1,                        img:require('./images/5.png'),                        sum:780,                        checked:false                    }                ],                check:false,                choose:0,            },                   ],    status:false,//全选选中状态    allchoose:0,//店铺选中个数    allsum:0,//总计价格    allnum:0,//总计数量}export default fetchData

此时运行你回发现报错：require is not define？ 解决办法：

const fetchData={        list:[            {                shop_id:1,                shop_name:'搜猎人艺术生活',                products:[                    {                        pro_id:101,                        text:'洗面奶洗面奶洗面奶洗面奶洗面奶洗面奶洗面奶洗面奶',                        price:480,                        num:1,                        img:new URL("./images/1.png",import.meta.url).href,                        sum:480,                        checked:false//商品选中状态                    },                    {                        pro_id:102,                        text:'花露水花露水花露水花露水花露水花露水花露水花露水',                        price:680,                        num:1,                        img:new URL('./images/2.png',import.meta.url).href,                        sum:680,                        checked:false                    },                    {                        pro_id:103,                        text:'燕麦片燕麦片燕麦片燕麦片燕麦片燕麦片燕麦片燕麦片',                        price:380,                        num:1,                        img:new URL('./images/3.png',import.meta.url).href,                        sum:380,                        checked:false                    }                ],                check:false,//店铺选中状态                choose:0,//商品选中个数            },            {                shop_id:2,                shop_name:'卷卷旗舰店',                products:[                    {                        pro_id:201,                        text:'剃须刀剃须刀剃须刀剃须刀剃须刀剃须刀剃须刀剃须刀',                        price:580,                        num:1,                        img:new URL('./images/4.png',import.meta.url).href,                        sum:580,                        checked:false                    },                    {                        pro_id:202,                        text:'卫生纸卫生纸卫生纸卫生纸卫生纸卫生纸卫生纸卫生纸',                        price:780,                        num:1,                        img:new URL('./images/5.png',import.meta.url).href,                        sum:780,                        checked:false                    }                ],                check:false,                choose:0,            },                    ],    status:false,//全选选中状态    allchoose:0,//店铺选中个数    allsum:0,//总计价格    allnum:0,//总计数量}export default fetchData

注意引用方式的变化：require------->new URL('./images/5.png',import.meta.url).href

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