Vue学习25----ElementUi(Pc框架)的使用,按需引入

按需引入：我们可以只引入需要的组件，以达到减小项目体积的目的。

看文档： http://element-cn.eleme.io/#/zh-CN/component/quickstart
使用步骤：
0、安装 cnpm i element-ui --save
1、安装 cnpm install babel-plugin-component -D
2、在.babelrc 中 配置文件
把

{
		  "presets": [
		    ["env", { "modules": false }],
		    "stage-3"
		  ]
		}

改为 注意：(2015改成dev)

{
		  "presets": [["env", { "modules": false }]],
		  "plugins": [
		    [
		      "component",
		      {
			"libraryName": "element-ui",
			"styleLibraryName": "theme-chalk"
		      }
		    ]
		  ]
		}

3、在webpack.config.js中 配置file_loader

         {
			test: /\.(eot|svg|ttf|woff|woff2)(\?\S*)?$/,
			loader: 'file-loader'
	                 }

4、在main.js中引入，要使用的组件

	import { Button, Select } from 'element-ui';

	Vue.use(Button)
	Vue.use(Select)

5、看文档使用
下面是一个例子：
项目结构：

在.babelrc 中 配置文件

{
  "presets": [["env", { "modules": false }]],
  "plugins": [
    [
      "component",
      {
        "libraryName": "element-ui",
        "styleLibraryName": "theme-chalk"
      }
    ]
  ]
}

webpack.config.js

var path = require('path')
var webpack = require('webpack')

module.exports = {
  entry: './src/main.js',
  output: {
    path: path.resolve(__dirname, './dist'),
    publicPath: '/dist/',
    filename: 'build.js'
  },
  module: {
    rules: [
      {
        test: /\.css$/,
        use: [
          'vue-style-loader',
          'css-loader'
        ],
      },
      {
        test: /\.scss$/,
        use: [
          'vue-style-loader',
          'css-loader',
          'sass-loader'
        ],
      },
      {
        test: /\.sass$/,
        use: [
          'vue-style-loader',
          'css-loader',
          'sass-loader?indentedSyntax'
        ],
      },
      {
        test: /\.vue$/,
        loader: 'vue-loader',
        options: {
          loaders: {
            // Since sass-loader (weirdly) has SCSS as its default parse mode, we map
            // the "scss" and "sass" values for the lang attribute to the right configs here.
            // other preprocessors should work out of the box, no loader config like this necessary.
            'scss': [
              'vue-style-loader',
              'css-loader',
              'sass-loader'
            ],
            'sass': [
              'vue-style-loader',
              'css-loader',
              'sass-loader?indentedSyntax'
            ]
          }
          // other vue-loader options go here
        }
      },
      {
        test: /\.js$/,
        loader: 'babel-loader',
        exclude: /node_modules/
      },
      {
        test: /\.(png|jpg|gif|svg)$/,
        loader: 'file-loader',
        options: {
          name: '[name].[ext]?[hash]'
        }
      },
      {
        test: /\.(eot|svg|ttf|woff|woff2)(\?\S*)?$/,
        loader: 'file-loader'
      }
    ]
  },
  resolve: {
    alias: {
      'vue$': 'vue/dist/vue.esm.js'
    },
    extensions: ['*', '.js', '.vue', '.json']
  },
  devServer: {
    historyApiFallback: true,
    noInfo: true,
    overlay: true
  },
  performance: {
    hints: false
  },
  devtool: '#eval-source-map'
}

if (process.env.NODE_ENV === 'production') {
  module.exports.devtool = '#source-map'
  // http://vue-loader.vuejs.org/en/workflow/production.html
  module.exports.plugins = (module.exports.plugins || []).concat([
    new webpack.DefinePlugin({
      'process.env': {
        NODE_ENV: '"production"'
      }
    }),
    new webpack.optimize.UglifyJsPlugin({
      sourceMap: true,
      compress: {
        warnings: false
      }
    }),
    new webpack.LoaderOptionsPlugin({
      minimize: true
    })
  ])
}

main.js 引入要用的组件

import Vue from 'vue'
import App from './App.vue'

import { Button, Select } from 'element-ui';

Vue.use(Button)
Vue.use(Select)

new Vue({
  el: '#app',
  render: h => h(App)
})

App.vue 中使用组件

<template>
  <div id="app">
    <el-row>
      <el-button>默认按钮</el-button>
      <el-button type="primary">主要按钮</el-button>
      <el-button type="success">成功按钮</el-button>
      <el-button type="info">信息按钮</el-button>
      <el-button type="warning">警告按钮</el-button>
      <el-button type="danger">危险按钮</el-button>
    </el-row>
  </div>
</template>

<script>
export default {
  name: 'app',
  data () {
    return {
      msg: 'Welcome to Your Vue.js App'
    }
  }
}
</script>

<style lang="scss">

</style>

源码下载：
vuedemo25
https://download.****.net/download/zhaihaohao1/11112020