[js高手之路]深入浅出webpack教程系列8-(postcss-loader,autoprefixer,html-loader,less-loader,ejs-loader)用法

[js高手之路]深入浅出webpack教程系列索引目录:

我们接着上文,那么在上篇文章的最后,写到了css-loader的用法,如果你用心发现,就能看到我在style.css样式文件中写了一个这样的样式:

div {
transition: all ease 1s;
}
一、这是一个css3的过渡样式,我们知道,写css3的时候,需要加上浏览器前缀. 那么我们着这里就需要安装postcss-loader和autoprefixer插件
安装postcss-loader: npm install postcss-loader --save-dev
安装autoprefixer: npm install autoprefixer --save-dev
 
在demo3目录下面新建一个postcss.config.js,代码如下:
1 module.exports = {
2     plugins : [
3         require('autoprefixer')({
4             browsers : ['last 5 versions']
5         })
6     ]
7 }

意思是在postcss-loader中引入autoprefixer插件

修改webpack.config.js中css loader部分的配置:

 1 var htmlWebpackPlugin = require('html-webpack-plugin');
 2 let path = require('path');
 3 module.exports = {
 4     entry: './src/main.js',
 5     output: {
 6         path: __dirname + '/dist',
 7         filename: 'js/[name].bundle.js',
 8     },
 9     plugins: [
10         new htmlWebpackPlugin({
11             filename: 'index.html',
12             template: 'index.html',
13             inject: true
14         })
15     ],
16     module: {
17         rules: [
18             {
19                 test: /\.js$/,
20                 exclude: /(node_modules)/,
21                 include: [
22                     path.resolve(__dirname, "src"),
23                 ],
24                 use: {
25                     loader: 'babel-loader',
26                     options: {
27                         presets: ['env']
28                     }
29                 }
30             },
31             {
32                 test: /\.css$/,
33                 exclude: /(node_modules)/,
34                 use: [ 
35                     'style-loader', {
36                         loader : 'css-loader',
37                         options : {
38                             importLoaders : 1
39                         },
40                     },
41                     'postcss-loader'
42                 ]
43             }
44         ]
45     }
46 }

执行webpack打包,生成之后的css文件,就自动补充css3前缀了:

 

二、安装less-loader插件

如果我们在modal.js中直接引入modal.less,然后webpack打包,这样会报错

1 import './modal.less';
2 let modal = function(){
3     return {
4         'component-name' : 'modal'
5     }
6 }
7 export default modal;

报错提示需要一个loader来处理, 我们可以安装less-loader了:

安装: npm install --save-dev less-loader less

安装完成之后,配置webpack.config.js

 1 var htmlWebpackPlugin = require('html-webpack-plugin');
 2 let path = require('path');
 3 module.exports = {
 4     entry: './src/main.js',
 5     output: {
 6         path: __dirname + '/dist',
 7         filename: 'js/[name].bundle.js',
 8     },
 9     plugins: [
10         new htmlWebpackPlugin({
11             filename: 'index.html',
12             template: 'index.html',
13             inject: true
14         })
15     ],
16     module: {
17         rules: [
18             {
19                 test: /\.js$/,
20                 exclude: /(node_modules)/,
21                 include: [
22                     path.resolve(__dirname, "src"),
23                 ],
24                 use: {
25                     loader: 'babel-loader',
26                     options: {
27                         presets: ['env']
28                     }
29                 }
30             },
31             {
32                 test: /\.css$/,
33                 exclude: /(node_modules)/,
34                 use: [ 
35                     'style-loader', {
36                         loader : 'css-loader',
37                         options : {
38                             importLoaders : 1
39                         },
40                     },
41                     'postcss-loader'
42                 ]
43             },
44             {
45                 test: /\.less$/,
46                 use: [
47                     {
48                         loader: "style-loader"
49                     }, {
50                         loader: "css-loader"
51                     }, {
52                         loader: "less-loader"
53                     }
54                 ]
55             }
56         ]
57     }
58 }

当碰到less文件时,交给less-loader处理,然后交给css-loader处理,最后交由style-loader处理,然后执行webpack打包,modal.less文件中样式就被嵌入进来了

三、安装html-loader

安装命令: npm install html-loader --save-dev

modal.js文件引入modal.html

1 import './modal.less';
2 import tpl from './modal.html';
3 let modal = function(){
4     return {
5         'component-name' : 'modal',
6         'tpl' : tpl
7     }
8 }
9 export default modal;

main.js对demo3目录下的index.html文件插入模板(modal.html)

1 import modal from './components/modal.js';
2 import './css/style.css';
3 let App = function(){
4     var oApp = document.querySelector("#app");
5     var oModal = new modal();
6     oApp.innerHTML = oModal.tpl;
7 }
8 new App();

 

demo3目录下的index.html文件,需要添加个div, id为app

webpack.config.js增加一项html-loader的配置

 1 var htmlWebpackPlugin = require('html-webpack-plugin');
 2 let path = require('path');
 3 module.exports = {
 4     entry: './src/main.js',
 5     output: {
 6         path: __dirname + '/dist',
 7         filename: 'js/[name].bundle.js',
 8     },
 9     plugins: [
10         new htmlWebpackPlugin({
11             filename: 'index.html',
12             template: 'index.html',
13             inject: true
14         })
15     ],
16     module: {
17         rules: [
18             {
19                 test: /\.js$/,
20                 exclude: /(node_modules)/,
21                 include: [
22                     path.resolve(__dirname, "src"),
23                 ],
24                 use: {
25                     loader: 'babel-loader',
26                     options: {
27                         presets: ['env']
28                     }
29                 }
30             },
31             {
32                 test: /\.css$/,
33                 exclude: /(node_modules)/,
34                 use: [ 
35                     'style-loader', {
36                         loader : 'css-loader',
37                         options : {
38                             importLoaders : 1
39                         },
40                     },
41                     'postcss-loader'
42                 ]
43             },
44             {
45                 test: /\.less$/,
46                 use: [
47                     {
48                         loader: "style-loader"
49                     }, {
50                         loader: "css-loader"
51                     }, {
52                         loader: "less-loader"
53                     }
54                 ]
55             },
56             {
57                 test: /\.(html)$/,
58                 use: {
59                     loader: 'html-loader',
60                 }
61             }
62         ]
63     }
64 }

然后执行webpack打包命令,就能看到modal.html被插入到id为app的div元素内了

 

四、修改模板后缀,为模板赋值

安装ejs-loader: npm install ejs-loader --save-dev

在components目录下新建一个文件(modal.ejs):

1 <div class="modal">
2     <div>这个组件的名字是:<%= name %></div>
3     <% for( var i = 0; i < arr.length; i++ ){ %>
4         <%= arr[i]%>
5     <% } %>
6 </div>

modal.js引入ejs模板

 1 import './modal.less';
 2 // import tpl from './modal.html';
 3 import tpl from './modal.ejs';
 4 let modal = function(){
 5     return {
 6         'component-name' : 'modal',
 7         'tpl' : tpl
 8     }
 9 }
10 export default modal;

main.js为ejs模板分配数据

 1 import modal from './components/modal.js';
 2 import './css/style.css';
 3 let App = function(){
 4     var oApp = document.querySelector("#app");
 5     var oModal = new modal();
 6     // oApp.innerHTML = oModal.tpl;
 7     oApp.innerHTML = oModal.tpl({
 8         name : 'ghostwu',
 9         arr : [ 'ghostwu', '王朝', '马汉' ],
10     });
11 }
12 new App();

webpack.config.js添加ejs-loader的支持:

 1 var htmlWebpackPlugin = require('html-webpack-plugin');
 2 let path = require('path');
 3 module.exports = {
 4     entry: './src/main.js',
 5     output: {
 6         path: __dirname + '/dist',
 7         filename: 'js/[name].bundle.js',
 8     },
 9     plugins: [
10         new htmlWebpackPlugin({
11             filename: 'index.html',
12             template: 'index.html',
13             inject: true
14         })
15     ],
16     module: {
17         rules: [
18             {
19                 test: /\.js$/,
20                 exclude: /(node_modules)/,
21                 include: [
22                     path.resolve(__dirname, "src"),
23                 ],
24                 use: {
25                     loader: 'babel-loader',
26                     options: {
27                         presets: ['env']
28                     }
29                 }
30             },
31             {
32                 test: /\.css$/,
33                 exclude: /(node_modules)/,
34                 use: [ 
35                     'style-loader', {
36                         loader : 'css-loader',
37                         options : {
38                             importLoaders : 1
39                         },
40                     },
41                     'postcss-loader'
42                 ]
43             },
44             {
45                 test: /\.less$/,
46                 use: [
47                     {
48                         loader: "style-loader"
49                     }, {
50                         loader: "css-loader"
51                     }, {
52                         loader: "less-loader"
53                     }
54                 ]
55             },
56             {
57                 test: /\.(html)$/,
58                 use: {
59                     loader: 'html-loader',
60                 }
61             },
62             {
63                 test: /\.(ejs)$/,
64                 use: {
65                     loader: 'ejs-loader',
66                 }
67             }
68         ]
69     }
70 }

然后执行webpack打包命令,就能看见新的ejs模板中的数据被嵌入在id为app的div中

 

 

posted @ 2017-09-11 16:35  ghostwu  阅读(...)  评论(...编辑  收藏
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