vue-element-admin学习笔记--自定义svg-icon组件

项目中有用到vue-element-admin,学习方法仍然是造轮子,慢但是能够理解每个细节。记录下遇到的问题和想记录的过程。

安装svg-sprite-loader

yarn add svg-sprite-loader

配置svg-icon的全局组件。在components>SvgIcon下新建index.vue

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

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

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

在src目录下新建icons目录,在icons目录下新建index.js及icons目录。index.js来注册全局组件。svg文件放在icons下的svg目录中。

index.js内容如下：

import Vue from "vue";
import SvgIcon from "@/components/SvgIcon";

// register globally
Vue.component("svg-icon", SvgIcon);

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

配置svg的loader,在vue.config.js中使用chainWebpack方法。参考vue官方的webpack相关配置及element-ui-vue的源码

"use strict";
const path = require("path");

function resolve(dir) {
  return path.join(__dirname, dir);
}


module.exports = {
  publicPath: "/",
  outputDir: "dist",
  assetsDir: "static",
  lintOnSave: process.env.NODE_ENV === "development",
  productionSourceMap: false,
  
  configureWebpack: {
  
    name: "G-test",
    resolve: {
      alias: {
        "@": resolve("src")
      }
    }
  },
  chainWebpack(config) {
    config.plugins.delete("preload"); // TODO: need test
    config.plugins.delete("prefetch"); // TODO: need test
    config.module
      .rule("svg")
      .exclude.add(resolve("src/icons"))
      .end();
    config.module
      .rule("icons")
      .test(/.svg$/)
      .include.add(resolve("src/icons"))
      .end()
      .use("svg-sprite-loader")
      .loader("svg-sprite-loader")
      .options({
        symbolId: "icon-[name]"
      })
      .end();

    config.module
      .rule("vue")
      .use("vue-loader")
      .loader("vue-loader")
      .tap(options => {
        options.compilerOptions.preserveWhitespace = true;
        return options;
      })
      .end();

    config
      // https://webpack.js.org/configuration/devtool/#development
      .when(process.env.NODE_ENV === "development", config =>
        config.devtool("cheap-source-map")
      );

    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");
    });
  }
};

在main.js中引入icons

import "./icons";

此时可以在全局中使用组件

<span class="svg-container">
  <svg-icon icon-class="user" />
</span>