获取商品分类
### 获取商品分类：
#### 请求url
* <font color=red>`/categories/shop-cart`</font>
#### 请求方式
* <font color=red>`GET`</font>
---
##### 返回示例
```json
{
"err": null,
"data": [
{
"_id": "6184e581603caaa12a95b2d8",
"categories": {
"data": [
{
"categoryId": 15,
"categoryLevel": 1,
"categoryName": "家电 数码 手机",
"secondLevelCategoryVOS": [
{
"categoryId": 17,
"parentId": 15,
"categoryLevel": 2,
"categoryName": "家电",
"thirdLevelCategoryVOS": [
{
"categoryId": 20,
"categoryLevel": 3,
"categoryName": "生活电器"
},
```