el-cascader 可以选择任意一级，并隐藏radio小圆点

一、开启 checkStrictly : true, 允许选择任意一级节点,

      然后开启鼠标移动触发 expandTrigger: 'hover'

     再添加一个ref="cascaderHandle"，并且在@change方法里             this.$refs.cascaderHandle.dropDownVisible = false;这样选中后就可以关闭下拉框

   <el-cascader
              ref="cascaderHandle"
              placeholder="请选择商品类目"
              :props="defaultParams"
              v-model="categoriess"
              :options="categoriesList"
              clearable
              @change="handleChange">
              <span slot-scope="{data}" @click="clickNode">{{ data.categoryName }}</span>
 </el-cascader>

 data() {
    return {
      defaultParams: {
        expandTrigger: 'hover',
        label: 'categoryName',
        value: 'id',
        children: 'childList',
        checkStrictly : true,
        expandTrigger: 'hover'
      }
  }

methods: {
    clickNode($event) {
      $event.target.parentElement.parentElement.firstElementChild.click();
    }
   
   //选择器选中触发事件 
   handleChange() {
        const index = this.categoriess.length-1;
        this.form.parentId = this.categoriess[index];
        this.$refs.cascaderHandle.dropDownVisible = false; //监听值发生变化就关闭它
        console.log(this.form.parentId);
      }
 }

二、实现点击文字触发选中事件，加一个插槽，绑定一个函数即可

 <span slot-scope="{data}" @click="clickNode">{{ data.categoryName }}</span>

methods: {
    clickNode($event) {
      $event.target.parentElement.parentElement.firstElementChild.click();
    }
 }

三、隐藏el-radio小圆点的样式

<style lang="scss">
 .el-cascader-panel .el-radio{ 
 	width: 100%;
 	height: 100%;
 	z-index: 10; 
 	position: absolute; 
 	top: 10px;
 	right: 10px; 
  } 
  .el-cascader-panel .el-radio__input{ 
     visibility: hidden; 
   } 
   .el-cascader-panel .el-cascader-node__postfix{ 
     top: 10px;
   } 

</style>