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webpack imports css and various loaders

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Jul 09, 2018 pm 05:32 PM

This article mainly introduces about webpack importing css and various loaders. It has certain reference value. Now I share it with everyone. Friends in need can refer to it

webpack imports css

1) Download the relevant loader npm install style-loader css-loader -D

2) Introduce index.css into main.js

1	`import './css/index.css'`

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3) Configure webpack.config.js

Use module attribute

const path = require(&#39;path&#39;)
 
module.exports = {
    mode: &#39;development&#39;,
    entry:path.join(__dirname,&#39;./src/main.js&#39;),//打包的那个文件    output:{
        path:path.join(__dirname,&#39;./dist&#39;),
        filename :&#39;bundle.js&#39;
    },
    devServer:{
        open:&#39;true&#39;,
        port:&#39;8081&#39;,
        contentBase:&#39;src&#39;
    },    module:{
        rules:[
            test: {&#39;/\.css$/&#39;,use[&#39;style-loader&#39;,&#39;css-loader&#39;]}
        ]
    }}

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Restart running `npm run dev`

2. Webpack imports images

Since importing images requires the use of url addresses, you need to introduce `url-loader` and `file-loader` ( `file-loader` depends on `url-loader` So it needs to be introduced together)

npm i url-loader file-loader -D

.box{
  background-image:url(&#39;../Images/1.jpg&#39;)  
}

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Configure webpack.config.js

module:{ 
    rules:[ 
        {test:/\.css$/,use:[&#39;style-loader&#39;,&#39;css-loader&#39;]},        {test:/\.(jpg|png|gif|bmp|jpeg)$/,use: url-loader?limit=4000&name=[hash:8]-[name].[ext]&#39; },　　　　 //如果图片大于limit的大小则不会被解析成base64
        //name设置是否重命名图片,  [name].[ext]是保持引入的时候的图片的名字,[hash:8]-[name].[ext]是自动在图片原名前加一个随机的hash值，防止图片重复
        ]
}

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3. Introduction of babel

in webpack For advanced ES6 syntax that some browsers do not recognize, use `babel` to convert

npm install babel-core babel-loader babel-plugin-transform-runtime -D //Conversion tool

npm install babel-preset-env babel-preset-stage -0 -D //Syntax

Configure in webpack.config.js

<span style="color: #000000">module:{ 
  rules:[       <span style="color: #ff0000"> {test:</span></span><span style="color: #ff0000">/\.js$/,use:&#39;babel-loader&#39;,<strong>exclude</strong>:/node_modules/</span><span style="color: #000000"><span style="color: #ff0000">}</span>
        //exclude是去掉不需要转换的包 <br/>　　]
}</span>

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Create a new `.babelrc in the root directory of the project ``babel` configuration file (JSON format, needs to comply with JSON specification)

1 2	`{` `"plugins":["transform-runtime"],` `"presets":["env","stage-0"]` `}`

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4. When using templates in webpack, you need to parse the .vue file

npm install vue-loader vue-template-compiler -D

Configuration in webpack.config.js

const VueLoaderPlugin = require(&#39;vue-loader/lib/plugin&#39;);module.exports = {
　　plugins:[
　　　　new VueLoaderPlugin(),
　　],　　module:{
　　　　rules:[
　　　　　　{test:/\.vue$/,use:&#39;vue-loader&#39;},
　　　　]　　
　　},
}

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High version When webpack uses vue-loader, you need to configure the plug-in (the blue part)

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