@url=http://localhost:3000

### 查的所有角色
GET {{url}}/roles HTTP/1.1

### 新增角色
POST {{url}}/roles HTTP/1.1
Content-Type: application/json

{
    "rolename":"GIF"
}


### 修改角色
PUT {{url}}/roles/4 HTTP/1.1
Content-Type: application/json

{
    "rolename":"刘一手"
}

### 删除角色
DELETE {{url}}/roles/4 HTTP/1.1