1. app.post('/doRegister', (req, res) => {
    2.   MongoClient.connect(url, { useUnifiedTopology: true }, (err, client) => {
    3.     if (err) {
    4.       console.log("连接数据库失败");
    5.       return
    6.     }
    7.     console.log("连接数据库成功");
    9.     let db = client.db(dbName);
    10.     //req.body
    11.     let body = querystring.parse(req.body)
    12.     db.collection('order_item').insertOne(body, (err, result) => {
    13.       if (err) {
    14.         console.log("增加数据失败");
    15.         return
    16.       }
    17.       console.log("增加数据成功");
    18.       res.send(200,"增加数据成功")
    19.     })
    21.   })
    22. })