el-cascader 获取label值

<el-cascader v-model="postValue"  :options="postOptions"  :props="props" ref='postSelectRef' @change='postValueChange($event)'></el-cascader>

postValueChange(value) {
    console.log(this.$refs["postSelectRef"].getCheckedNodes());
    console.log(
        this.$refs["postSelectRef"].getCheckedNodes()[0].data.label
    );
},