# vue打包优化
# 分析包内容
在package.json中加入下列代码，运行 npm run build-report,然后打开dist目录下的 report.html查看各个包大小
"scripts": {
"build-report": "vue-cli-service build --report "
}
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从下图可以看出，venders.js中element-ui和echarts是影响文件大小的主要因素
# 优化element-ui
项目中有很多未用到的element-ui组件，所以我们按需引入需要的组件来优化大小，按需引入依赖 babel-plugin-component插件
npm install babel-plugin-component -D- .babelrc或者babel.config.js 修改为：
{
"presets": [["es2015", { "modules": false }]],
"plugins": [
[
"component",
{
"libraryName": "element-ui",
"styleLibraryName": "theme-chalk"
}
]
]
}
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- 按需引入组件
import Vue from 'vue';
import {
Pagination,
Dialog,
Autocomplete,
Dropdown,
DropdownMenu,
DropdownItem,
Menu,
Submenu,
MenuItem,
MenuItemGroup,
Input,
InputNumber,
Radio,
RadioGroup,
RadioButton,
Checkbox,
CheckboxButton,
CheckboxGroup,
Switch,
Select,
Option,
OptionGroup,
Button,
ButtonGroup,
Table,
TableColumn,
DatePicker,
TimeSelect,
TimePicker,
Popover,
Tooltip,
Breadcrumb,
BreadcrumbItem,
Form,
FormItem,
Tabs,
TabPane,
Tag,
Tree,
Alert,
Slider,
Icon,
Row,
Col,
Upload,
Progress,
Spinner,
Badge,
Card,
Rate,
Steps,
Step,
Carousel,
CarouselItem,
Collapse,
CollapseItem,
Cascader,
ColorPicker,
Transfer,
Container,
Header,
Aside,
Main,
Footer,
Timeline,
TimelineItem,
Link,
Divider,
Image,
Calendar,
Backtop,
PageHeader,
CascaderPanel,
Loading,
MessageBox,
Message,
Notification
} from 'element-ui';
Vue.use(Pagination);
Vue.use(Dialog);
Vue.use(Autocomplete);
Vue.use(Dropdown);
Vue.use(DropdownMenu);
Vue.use(DropdownItem);
Vue.use(Menu);
Vue.use(Submenu);
Vue.use(MenuItem);
Vue.use(MenuItemGroup);
Vue.use(Input);
Vue.use(InputNumber);
Vue.use(Radio);
Vue.use(RadioGroup);
Vue.use(RadioButton);
Vue.use(Checkbox);
Vue.use(CheckboxButton);
Vue.use(CheckboxGroup);
Vue.use(Switch);
Vue.use(Select);
Vue.use(Option);
Vue.use(OptionGroup);
Vue.use(Button);
Vue.use(ButtonGroup);
Vue.use(Table);
Vue.use(TableColumn);
Vue.use(DatePicker);
Vue.use(TimeSelect);
Vue.use(TimePicker);
Vue.use(Popover);
Vue.use(Tooltip);
Vue.use(Breadcrumb);
Vue.use(BreadcrumbItem);
Vue.use(Form);
Vue.use(FormItem);
Vue.use(Tabs);
Vue.use(TabPane);
Vue.use(Tag);
Vue.use(Tree);
Vue.use(Alert);
Vue.use(Slider);
Vue.use(Icon);
Vue.use(Row);
Vue.use(Col);
Vue.use(Upload);
Vue.use(Progress);
Vue.use(Spinner);
Vue.use(Badge);
Vue.use(Card);
Vue.use(Rate);
Vue.use(Steps);
Vue.use(Step);
Vue.use(Carousel);
Vue.use(CarouselItem);
Vue.use(Collapse);
Vue.use(CollapseItem);
Vue.use(Cascader);
Vue.use(ColorPicker);
Vue.use(Transfer);
Vue.use(Container);
Vue.use(Header);
Vue.use(Aside);
Vue.use(Main);
Vue.use(Footer);
Vue.use(Timeline);
Vue.use(TimelineItem);
Vue.use(Link);
Vue.use(Divider);
Vue.use(Image);
Vue.use(Calendar);
Vue.use(Backtop);
Vue.use(PageHeader);
Vue.use(CascaderPanel);
Vue.use(Loading.directive);
Vue.prototype.$loading = Loading.service;
Vue.prototype.$msgbox = MessageBox;
Vue.prototype.$alert = MessageBox.alert;
Vue.prototype.$confirm = MessageBox.confirm;
Vue.prototype.$prompt = MessageBox.prompt;
Vue.prototype.$notify = Notification;
Vue.prototype.$message = Message;
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# 查看优化后大小
未优化前 1.53M，优化后 302.16kb。
# 按需引入 echarts
将echarts 升级为 "echarts": "^5.0.2"
import * as echarts from 'echarts/core';
import {
BarChart
} from 'echarts/charts';
import {
TitleComponent,
TooltipComponent,
GridComponent
} from 'echarts/components';
import {
CanvasRenderer
} from 'echarts/renderers';
echarts.use(
[TitleComponent, TooltipComponent, GridComponent, BarChart, CanvasRenderer]
);
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未按需引入前大小
按需引入后大小
# 使用gzip
npm i -D compression-webpack-plugin@1.1.12，使用这个版本，其他版本会报错。
在vue.config.js中加入下列代码
...
const CompressionPlugin = require('compression-webpack-plugin');
const productionGzipExtensions = /\.(js|css|json|txt|html|ico|svg)(\?.*)?$/i;
....
module.exports = {
configureWebpack: {
plugins: [
new CompressionPlugin({
filename: '[path].gz[query]',
algorithm: 'gzip',
test: productionGzipExtensions,
threshold: 10240,
minRatio: 0.8,
deleteOriginalAssets: true
})
]
}
}
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执行npm run build-report, 查看打包后的dist目录，目录中会对应有 **.**.gz的文件
# 路由懒加载
无需赘述
# CDN及externals
const isProduction = process.env.VUE_APP_MODE === 'production'
const cdn = {
// 忽略打包的第三方库
/**
* externals 对象属性解析：
* '包名' : '在项目中引入的名字'
* 以element-ui举例 我再main.js里是以
* import ELEMENT from 'element-ui'
* Vue.use(ELEMENT, { size: 'small' })
* 这样引入的，所以我的externals的属性值应该是ELEMENT
*/
externals: {
vue: 'Vue',
vuex: 'Vuex',
'vue-router': 'VueRouter',
axios: 'axios',
'element-ui': 'ELEMENT'
},
js: [
'https://cdn.jsdelivr.net/npm/vue',
'https://unpkg.com/vue-router/dist/vue-router.js',
'https://cdn.bootcss.com/vuex/3.0.1/vuex.min.js',
'https://cdn.bootcdn.net/ajax/libs/axios/0.19.2/axios.min.js',
'https://unpkg.com/element-ui@2.13.2/lib/index.js'
],
css: [
'https://unpkg.com/element-ui@2.13.2/lib/theme-chalk/index.css'
]
}
module.exports = {
chainWebpack: (config) => {
if (isProduction) {
config.plugin('html').tap((args) => {
args[0].cdn = cdn
return args
})
}
config.plugin('html').tap(args => { // 所有环境配置统一的title
args[0].title = '外部联网协议配置系统'
return args
})
}
configureWebpack: config => {
config.externals = cdn.externals
}
}
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index.html中
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width,initial-scale=1.0">
<link rel="icon" href="<%= BASE_URL %>favicon.ico">
<link rel="stylesheet" href="./reset.css">
<title><%= htmlWebpackPlugin.options.title %></title>
<!-- 使用CDN的CSS文件 -->
<% for (var i in htmlWebpackPlugin.options.cdn && htmlWebpackPlugin.options.cdn.css) { %>
<link href="<%= htmlWebpackPlugin.options.cdn.css[i] %>" rel="preload" as="style">
<link href="<%= htmlWebpackPlugin.options.cdn.css[i] %>" rel="stylesheet">
<% } %>
</head>
<body>
<noscript>
<strong>We're sorry but <%= htmlWebpackPlugin.options.title %> doesn't work properly without JavaScript enabled. Please enable it to continue.</strong>
</noscript>
<div id="app"></div>
<!-- built files will be auto injected -->
<% for (var i in htmlWebpackPlugin.options.cdn && htmlWebpackPlugin.options.cdn.js) { %>
<script src="<%= htmlWebpackPlugin.options.cdn.js[i] %>"></script>
<% } %>
</body>
</html>
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# 关闭Prefetch
因为vuecli 3默认开启prefetch(预先加载模块)，提前获取用户未来可能会访问的内容 在首屏会把这十几个路由文件，都下载了,所以我们要关闭这个功能
config.plugins.delete('prefetch')
config.plugins.delete('preload')
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