// 级联自定义规则
      propsRule: {
        value: "channelId",
        label: "channelName",
        children: "children",
        emitPath: false,
      },



<el-cascader
                  :options="frequencyList"
                  v-model="formInline.channelId"
                  :props="propsRule"
                  style="width: 100%"
                ></el-cascader>