vue项目使用svg问题

一、在vue项目中使用自定义的icon图标：

##  1.下载

	npm i svg-sprite-loader@4.1.3

2.配置config文件

'use strict'
const path = require('path')
 
function resolve(dir) {
  return path.join(__dirname, dir)
}
 
module.exports = {
    chainWebpack (config) {
    // when there are many pages, it will cause too many meaningless requests
    config.plugins.delete('prefetch')
    // set svg-sprite-loader
    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()
  }
}

3.创建icon文件，存放svg格式图片

import Vue from 'vue'
import SvgIcon from '@/components/SvgIcon'// svg component

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

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

4.创建组件components = > Svgicon

<template>
  <div v-if="isExternal" :style="styleExternalIcon" class="svg-external-icon svg-icon" v-on="$listeners" />
  <svg v-else :class="svgClass" aria-hidden="true" v-on="$listeners">
    <use :xlink:href="iconName" />
  </svg>
</template>
 
<script>
// doc: https://panjiachen.github.io/vue-element-admin-site/feature/component/svg-icon.html#usage
import { isExternal } from '@/utils/validate'
 
export default {
  name: 'SvgIcon',
  props: {
    iconClass: {
      type: String,
      required: true
    },
    className: {
      type: String,
      default: ''
    }
  },
  computed: {
    isExternal() {
      return isExternal(this.iconClass)
    },
    iconName() {
      return `#icon-${this.iconClass}`
    },
    svgClass() {
      if (this.className) {
        return 'svg-icon ' + this.className
      } else {
        return 'svg-icon'
      }
    },
    styleExternalIcon() {
      return {
        mask: `url(${this.iconClass}) no-repeat 50% 50%`,
        '-webkit-mask': `url(${this.iconClass}) no-repeat 50% 50%`
      }
    }
  }
}
</script>
 
<style scoped>
.svg-icon {
  width: 1em;
  height: 1em;
  vertical-align: -0.15em;
  fill: currentColor;
  overflow: hidden;
}
 
.svg-external-icon {
  background-color: currentColor;
  mask-size: cover!important;
  display: inline-block;
}
</style>

5.src=>utils=>validate.js

   export function isExternal(path) {
 return /^(https?:|mailto:|tel:)/.test(path)
}

6.在main中引入

7.使用
使用有两种情况
1.直接使用

2.svg-icon

二、遇到的问题：

![在这里插入图片描述](https://img-blog.csdnimg.cn/3fc1bde951944959943ca161aad657f1.png)

Invalid prop: type check failed for prop "iconClass". Expected String with value "undefined", got Undefined

造成这个问题的原因是有一个tree没有icon图标
解决办法：添加一个判断，图标为null时不执行