vue element-ui tree 节点加虚线，样式修改_iview tree 虚线

   <el-tree
        ref="tree"
        :props="defaultProps"
        current-node-key="1"
        :load="loadNode"
        lazy
        indent="0"
        node-key="space_id"
        :default-expanded-keys="defaultExpanded"
        :filter-node-method="filterNode"
        :expand-on-click-node="true"
        highlight-current
        @node-collapse="nodeCollapse"
        @node-expand="nodeExpand"
      >
        <div class="custom-tree-node" slot-scope="{ node, data}">
          <div>
            <svg-icon icon-class="space" class="icon-space" v-if="!data.is_child||data.space_id=='0'"/>
            <svg-icon icon-class="file" class="icon-space" v-else/>
            <span @click.stop="