elementUI tree树形控件结合阿里图标icon修改三角图标样式

需求：项目做类型文件j夹列表树，设计需要将三角图标替换成UI设计的icon，UI设计的icon放在了阿里图标库

// main.js中先引入iconfont的css和js
import '@/assets/iconfont/iconfont.css'
import '@/assets/iconfont/iconfont.js'

解决方案1、

<el-tree
            :data="getPerSrcTree"
            default-expand-all
            :expand-on-click-node="false"
            node-key="id"
            ref="atree"
            highlight-current
            :check-strictly="true"
            :props="defaultProps"
            @node-click="nodeClick"
          >
             <span class="custom-tree-node"  slot-scope="{ node }">
                <span style="display: flex;align-items: center;">
                  <i calss="iconfont icon-wendangdakai" width="20px" height="20px"></i>{
    
    {
    
     node.label  }}
                </span>              
            </span> 
          </el-tree>

这种方式出来的icon就会没有颜色，就要在css内设置需要的颜色，如果用svg的话直接就可以将原有颜色显示出来

<el-tree
    :data="getPerSrcTree"
      default-expand-all
      :expand-on-click-node="false"
      node-key="id"
      ref="atree"
      highlight-current
      :check-strictly="true"
      :props="defaultProps"
      @node-click="nodeClick"
    >
      <span class="custom-tree-node"  slot-scope="{ node }">
          <span style="display: flex;align-items: center;">
            <iconSvg name="wendangdakai" width="20px" height="20px"></iconSvg>{
    
    {
    
     node.label  }}
          </span>              
      </span>
    </el-tree>

封装的iconSvg

<template>
  <svg
    :class="getClassName"
    :width="width"
    :height="height"
    aria-hidden="true">
    <use :xlink:href="getName"></use>
  </svg>
</template>

<script>
  export default {
    
    
    name: 'icon-svg',
    props: {
    
    
      name: {
    
    
        type: String,
        required: true
      },
      className: {
    
    
        type: String
      },
      width: {
    
    
        type: String,
        default:"40px"
      },
      height: {
    
    
        type: String,
        default:"40px"
      }
    },
    computed: {
    
    
      getName () {
    
    
        return `#icon-${
      
      this.name}`
      },
      getClassName () {
    
    
        return [
          'icon-svg',
          `icon-svg__${
      
      this.name}`,
          this.className && /\S/.test(this.className) ? `${
      
      this.className}` : ''
        ]
      }
    }
  }
</script>

<style>
  .icon-svg {
    
    
    fill: currentColor;
    overflow: hidden;
  }
</style>

实现效果图

如果想要每个一级目录是不同的icon的话，直接在data数据内每级加个icon字段

getPerSrcTree: [{
    
    
          label: '一级 1',
          icon:'wendangdakai',
          children: [{
    
    
            label: '二级 1-1',
            children: [{
    
    
              label: '三级 1-1-1'
            }]
          }]
        }, {
    
    
          label: '一级 2',
          children: [{
    
    
            label: '二级 2-1',
            children: [{
    
    
              label: '三级 2-1-1'
            }]
          }, {
    
    
            label: '二级 2-2',
            children: [{
    
    
              label: '三级 2-2-1'
            }]
          }]
        }, {
    
    
          label: '一级 3',
          children: [{
    
    
            label: '二级 3-1',
            children: [{
    
    
              label: '三级 3-1-1'
            }]
          }, {
    
    
            label: '二级 3-2',
            children: [{
    
    
              label: '三级 3-2-1'
            }]
          }]
        }],


<el-tree
    :data="getPerSrcTree"
      default-expand-all
      :expand-on-click-node="false"
      node-key="id"
      ref="atree"
      highlight-current
      :check-strictly="true"
      :props="defaultProps"
      @node-click="nodeClick"
    >
      <span class="custom-tree-node"  slot-scope="{ node,data }">
          <span style="display: flex;align-items: center;">
            <iconSvg :name="data.icon" width="20px" height="20px"></iconSvg>{
    
    {
    
     node.label  }}
          </span>              
      </span>
    </el-tree>

但是这种没办法实现展开和收起两个不同的icon

解决方案2

通过css样式进行修改

<el-tree
    :data="getPerSrcTree"
      default-expand-all
      :expand-on-click-node="false"
      node-key="id"
      ref="atree"
      highlight-current
      :check-strictly="true"
      :props="defaultProps"
      @node-click="nodeClick"
    ></el-tree>

<style  scoped>
.el-tree /deep/ .el-icon-caret-right:before{
    
    
  content: "\e85a";  //在引入的iconfont文件夹找到iconfont.css
  font-size: 25px;
  font-family: "iconfont"; //想要显示icon这个必须加
  color:rgb(43, 206, 229)  //想要的颜色
}
.el-tree /deep/ .el-tree-node__expand-icon.expanded.el-icon-caret-right:before
{
    
    
  content: "\e85b";
  font-size: 25px;
  font-family: "iconfont";
  color:rgb(43, 206, 229)
}
.el-tree /deep/ .el-tree-node__expand-icon.expanded
{
    
    
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
}
/* 没有子节点 */
.el-tree /deep/.el-tree-node__expand-icon.is-leaf::before
{
    
    
    font-size: 25px;
    content: '\e85d';
    font-family: "iconfont";
    color:rgb(43, 206, 229)
}
</style>

在css里面content的内容是在引入的iconfont文件夹找到iconfont.css中找到对应的内容，font-family: “iconfont”;一定要写，这样才能出现图标

最后实现效果如图，展开何未展开就会有两种显示效果，且目录下面如果没有子集的话就会显示出文件icon而不是文件夹icon了