Optimize vue-cli first screen loading time

This time I will bring you the optimization of the first screen loading time of vue-cli. What are the precautions for optimizing the first screen loading time of vue-cli? The following is a practical case, let’s take a look.

Large file positioning

We can use the webpack visual plug-inWebpack Bundle Analyzer View the project js file size, and then have The purpose is to solve the js file that is too large.

Installation

npm install --save-dev webpack-bundle-analyzer

Set as follows in webpack, then npm run dev will be displayed on port 8888 by default .

const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin;
module.exports = {
 plugins: [
  new BundleAnalyzerPlugin()
 ]
}

JS files are loaded on demand

Without this setting, all JS files of the entire website will be loaded when the first screen of the project is loaded, so It is a good optimization method to disassemble the JS file and load the JS of a certain page when the page is clicked.

What is used here is the lazy loading of vue components. In router.js, do not use the import method to introduce components, use require.ensure.

import index from '@/components/index'
const index = r => require.ensure( [], () => r (require('@/components/index'),'index'))
//如果写了第二个参数，就打包到该`/JS/index` 的文件中。
//不写第二个参数，就直接打包在`/JS` 目录下。
const index = r => require.ensure( [], () => r (require('@/components/index')))

When using cdn

, replace vue, vuex, vue-router, axios, etc. with domestic bootcdn and directly introduce them to In index.html in the root directory.

Add externals in webpack settings and ignore libraries that do not need to be packaged.

externals: { 
 'vue': 'Vue', 
 'vue-router': 'VueRouter', 
 'vuex': 'Vuex', 
 'axios': 'axios' 
}

Use cdn to import in index.html.

<script src="//cdn.bootcss.com/vue/2.2.5/vue.min.js"></script> 
<script src="//cdn.bootcss.com/vue-router/2.3.0/vue-router.min.js"></script>
<script src="//cdn.bootcss.com/vuex/2.2.1/vuex.min.js"></script> 
<script src="//cdn.bootcss.com/axios/0.15.3/axios.min.js"></script>

Place the JS file at the end of the body

By default, in the built index.html, js is introduced in header.

Use the html-webpack-plugin plug-in and change the value of inject to body. You can put the js introduction at the end of the body.

var HtmlWebpackPlugin = require('html-webpack-plugin');
new HtmlWebpackPlugin({
   inject: 'body',
})

Compress the code and remove the console

Use the UglifyJsPlugin plug-in to compress the code and remove the console.

new webpack.optimize.UglifyJsPlugin({
 compress: {
  warnings: false,
  drop_console: true,
  pure_funcs: ['console.log']
 },
 sourceMap: false
})

Only these optimization methods have been found for the time being.

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

Recommended reading:

Using slots/scoped slots in Vue in actual projects

##What are the precautions for using Dom in Angular2

The above is the detailed content of Optimize vue-cli first screen loading time. For more information, please follow other related articles on the PHP Chinese website!