vue-svg使用和组件封装

1.安装处理svg文件的loader

npm install svg-sprite-loader -D

通过vue-cli脚手架创建的项目默认情况下会使用 url-loader 对svg进行处理，所以需要处理下：

vue版本2之前处理如下：修改webpack.base.conf.js配置

  {
    test: /.svg$/,
    loader: 'svg-sprite-loader',
    include: [resolve('src/assets/icons')], // include => 只处理指定的文件夹下的文件
    options: {
        symbolId: 'icon-[name]'
    }
  },
  {
    test: /.(png|jpe?g|gif|svg)(?.*)?$/,
    loader: 'url-loader',
    exclude: [resolve('src/assets/icons')], // exclude => 不处理指定的文件夹下的文件
    options: {
      limit: 10000,
      name: utils.assetsPath('img/[name].[hash:7].[ext]')
    }
  }

vue3版本及以上：在vue.config.js文件中添加以下配置

'use strict'
const path = require('path')
function resolve(dir) {
  return path.join(__dirname, dir)
}

module.exports = {
　// 处理运行时版本报错
  runtimeCompiler: true,
  chainWebpack(config) {
    // set svg-sprite-loader
    config.module
      .rule('svg')
      .exclude.add(resolve('src/assets/icons'))
      .end()
    config.module
      .rule('icons')
      .test(/.svg$/)
      .include.add(resolve('src/assets/icons'))
      .end()
      .use('svg-sprite-loader')
      .loader('svg-sprite-loader')
      .options({
        symbolId: 'icon-[name]'
      })
      .end()

    config
      .when(process.env.NODE_ENV !== 'development',
        config => {
          config
            .plugin('ScriptExtHtmlWebpackPlugin')
            .after('html')
            .use('script-ext-html-webpack-plugin', [{
              // `runtime` must same as runtimeChunk name. default is `runtime`
              inline: /runtime..*.js$/
            }])
            .end()
          config
            .optimization.splitChunks({
            chunks: 'all',
            cacheGroups: {
              libs: {
                name: 'chunk-libs',
                test: /[\/]node_modules[\/]/,
                priority: 10,
                chunks: 'initial' // only package third parties that are initially dependent
              },
              elementUI: {
                name: 'chunk-elementUI', // split elementUI into a single package
                priority: 20, // the weight needs to be larger than libs and app or it will be packaged into libs or app
                test: /[\/]node_modules[\/]_?element-ui(.*)/ // in order to adapt to cnpm
              },
              commons: {
                name: 'chunk-commons',
                test: resolve('src/components'), // can customize your rules
                minChunks: 3, //  minimum common number
                priority: 5,
                reuseExistingChunk: true
              }
            }
          })
          config.optimization.runtimeChunk('single'),
            {
              from: path.resolve(__dirname, './public/robots.txt'), //防爬虫文件
              to: './', //到根目录下
            }
        }
      )
  }
}

2. 存放svg文件

src-->assets-->icons-->svg

 同级目录下创建index.js和requireIcons.js，用于导出svg图片的处理

index文件：

import Vue from 'vue'
import SvgIcon from '@/components/SvgIcon.vue'

Vue.component('svg-icon', SvgIcon)

const requireAll = requireContext => requireContext.keys().map(requireContext)
const req = require.context('./svg', false, /.svg$/)
requireAll(req)

requireIcons.js文件：

  const req = require.context('./svg', false, /.svg$/)
  const requireAll = requireContext => requireContext.keys()
  
  const re = /./(.*).svg/
  const icons = requireAll(req).map(i => {
    return i.match(re)[1]
  })
  export default icons

组件封装：

src-->components-->SvgIcon.vue

<template>
  <svg :class="svgClass" aria-hidden="true">
    <use :xlink:href="iconName"></use>
  </svg>
</template>

<script>
export default {
  name: 'svg-icon',
  props: {
    iconClass: {
      type: String,
      required: true
    },
    className: {
      type: String
    }
  },
  computed: {
    iconName () {
      return `#icon-${this.iconClass}`
    },
    svgClass () {
      if (this.className) {
        return 'svg-icon ' + this.className
      } else {
        return 'svg-icon'
      }
    }
  }
}
</script>

<style>
.svg-icon {
       1em;
      height: 1em;
      vertical-align: -0.15em;
      fill: currentColor;
      overflow: hidden;
  }
</style>

使用：

1.main.js中

// 模块仅为副作用（中性词、无贬义含义）而导入，而不是导入模块中的任何内容，
// 这将运行模块中的全局代码，但实际上不导入任何值
import './assets/icons/index'

2.需要使用的地方

<template>
  <div id="app">
　　
    <span class="svg-container svg-container_login">
        <svg-icon icon-class="user" />
    </span>
    <div class="svg-container">
       <svg-icon icon-class="password"></svg-icon>
     </div>
    <div class="svg-container">
      <svg-icon icon-class="404"></svg-icon>
    </div>
    <div class="icon-list">
      <div v-for="(item, index) in iconList" :key="index">
        <svg-icon :icon-class="item" style="height: 30px; 16px;color: purple;" />
        <span>{{ item }}</span>
      </div>
    </div>
  </div>
</template>

<script>
import icons from './assets/icons/requireIcons.js'
export default {
  name: 'App',
  data () {
    return {
      iconList: icons
    }
  }
}
</script>

<style>
  .svg-container {
      font-size: 40px;
      color: blue;
  }
  .icon-list {
    height: 200px;
    overflow-y: scroll;
  }
</style>

单独使用某个图标：

<svg-icon icon-class="404"></svg-icon>

遍历展示所有图标：

<div v-for="(item, index) in iconList" :key="index">
    <svg-icon :icon-class="item" style="height: 30px; 16px;color: purple;" />
    <span>{{ item }}</span>
 </div>

修改图标颜色：

.svg-container {
      font-size: 40px;
      color: blue;
  }

完整项目demo：

https://github.com/lily-mengbm/Web-page-template/tree/master/demo_svg_v4