2.webpack入门使用loader处理css
首先上代码
- 新建main.css
win创建文件命令
type > main.css
修改内容为
#app {
background: red;
color: rgb(26, 4, 122);
}
- 修改app.js引入css
import { show } from './test'
require('./main.css')
show (' world')
- 修改webpack.config.js
const path= require ('path')
module.exports = {
entry:'./app.js',
output: {
filename:'bundle.js',
path: path.resolve( __dirname,'dist')
},
module:{
rules:[
{
test:/\.css$/,
use: ['style-loader', 'css-loader'],
}
]
}
}
module是使用loader部分,注意引用顺序'style-loader', 'css-loader'
test 是匹配的文件正则
use 属性的值需要是一个由 Loader 名称组成的数组， Loader 的执行顺序是由后到前的
- 最后安装 css-loader style-loader
npm install css-loader style-loader -S -D
npm run build 一下完美结束
- 目录结构
demo1.1
--index.html
--app.js
--test.js
--main.css
--webpack.config.js
--package.json
- 最后附上各文件代码
index.html
<!DOCTYPE html>
<html>
<head> <meta charset="UTF-8"> </head>
<body> <div id="app" ></div>
<script src="./dist/bundle.js"></script>
</body>
</html>
app.js
import { show } from './test'
require('./main.css')
show (' world')
test.js
export const show = function (content) {
window.document.getElementById ('app') .innerText = 'Hello1' + content
}
main.css
#app {
background: red;
color: rgb(26, 4, 122);
}
webpack.config.js
const path= require ('path')
module.exports = {
entry:'./app.js',
output: {
filename:'bundle.js',
path: path.resolve( __dirname,'dist')
},
module:{
rules:[
{
test:/\.css$/,
use: ['style-loader', 'css-loader'],
}
]
}
}
package.json
{
"name": "demo1.1",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1",
"build": "webpack --config ./webpack.config.js"
},
"author": "",
"license": "ISC",
"devDependencies": {
"css-loader": "^4.2.2",
"style-loader": "^1.2.1",
"webpack": "^4.44.1",
"webpack-cli": "^3.3.12"
},
"dependencies": {}
}
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