POST /order/create

name: "张三"
phone: "18868822111"
address: "慕课网总部"
openid: "ew3euwhd7sjw9diwkq" //用户的微信openid
items: [{
    productId: "1423113435324",
    productQuantity: 2 //购买数量
}]

{
  "code": 0,
  "msg": "成功",
  "data": {
      "orderId": "147283992738221" 
  }
}