关于发送请求后未得到响应而报错的处理办法

╰半夏微凉° 2023-08-17 15:21 137阅读 0赞

在最近的项目中，如果我在 for循坏里面进行数据库的增删改查然后返回数据的话，是不能得到响应的，具体大家来看报错。

*  浏览器调试工具报错  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzE3NjMzNw_size_16_color_FFFFFF_t_70]
 *  前端报错  
    ![在这里插入图片描述][20190926090000127.png]
 *  后端报错  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzE3NjMzNw_size_16_color_FFFFFF_t_70 1]
 *  解决方案  
    在for 循坏外面加上

var isShow = false;
                  (async function () {
                    await new Promise((resolve, reject) => {
                      updata.forEach(item => {
                        Stock.findOneAndUpdate({
                            _id: ObjectId(item._id)
                          }, {
                            $set: {
                              transaction_type: item.transaction_type,
                              transaction_time: item.transaction_time,
                              remain_qty: item.remain_qty,
                              qty: item.qty
                            }
                          }, {
                            new: true
                          },
                          function (err, data6) {
                            if (err) {
                              console.log(err)
                            } else {
                              resolve(isShow = true)
                            }
                          })
                      })
                    })
                    if (isShow == true) {
                      res.json({
                        status: "200"
                      })
                    }
                  })()

*  在具体接口中（我这边是项目中的删除接口）

删除操作
    router.delete("/deleteStock", (req, res) => {
      let stockid = req.body._id
      let employee_id = req.body.employee_id
      let updata = []
      let currindex = 0
      Stock.find({
        "employee_id": employee_id
      }, function (err, data) {
        if (err) {
          console.log(err)
        } else if (data) {
          data.forEach((item, index) => {
            if ((item._id).toString() == stockid.toString()) {
              currindex = index;
              data.splice(index, 1)
            }
          })
        
          Stock.deleteOne({
            _id: req.body._id
          }, function (err, data1) {
            if (err) {
              console.log(err)
            }
          })
          for (let i = currindex; i < data.length; i++) {
    
            if (data[i].transaction_type == "购买" || data[i].transaction_type == "发放") {
              if (i == 0) {
                data[i].remain_qty = data[i].qty
              } else {
                data[i].remain_qty = data[i - 1].remain_qty + data[i].qty
              }
            } else if (data[i].transaction_type == "转移" || data[i].transaction_type == "卖出") {
              if (i == 0) {
                data[i].remain_qty = -data[i].qty
              } else {
                data[i].remain_qty = data[i - 1].remain_qty - data[i].qty
              }
            }
            updata.push(data[i])
          }
          if(updata.length>0){
           
            if(updata.length==data.length){
              const finalStock = updata[updata.length-1].remain_qty
            Employee.findOneAndUpdate({                                                                                
                    _id: employee_id
                  }, {
                    $set: {
                      "remain_stock": finalStock
                    }
                  }, function (err, data) {
                  })
              var isShow = false;
                  (async function () {
                    await new Promise((resolve, reject) => {
                      updata.forEach(item => {
                        Stock.findOneAndUpdate({
                            _id: ObjectId(item._id)
                          }, {
                            $set: {
                              transaction_type: item.transaction_type,
                              transaction_time: item.transaction_time,
                              remain_qty: item.remain_qty,
                              qty: item.qty
                            }
                          }, {
                            new: true
                          },
                          function (err, data6) {
                            if (err) {
                              console.log(err)
                            } else {
                              resolve(isShow = true)
                            }
                          })
                      })
                    })
                    if (isShow == true) {
                      res.json({
                        status: "200"
                      })
                    }
                  })()
            }
            
            
            else{
            const finalStock = updata[updata.length-1].remain_qty
            Employee.findOneAndUpdate({                                                                                
                    _id: employee_id
                  }, {
                    $set: {
                      "remain_stock": finalStock
                    }
                  }, function (err, data) {
                  })
                  var isShow = false;
                  (async function () {
                    await new Promise((resolve, reject) => {
                      updata.forEach(item => {
                        Stock.findOneAndUpdate({
                            _id: ObjectId(item._id)
                          }, {
                            $set: {
                              transaction_type: item.transaction_type,
                              transaction_time: item.transaction_time,
                              remain_qty: item.remain_qty,
                              qty: item.qty
                            }
                          }, {
                            new: true
                          },
                          function (err, data6) {
                            if (err) {
                              console.log(err)
                            } else {
                              resolve(isShow = true)
                            }
                          })
                      })
                    })
                    if (isShow == true) {
                      res.json({
                        status: "200"
                      })
                    }
                  })()}
          }else if(updata.length==0){
            if(data.length>0){
              const finalStock = data[data.length-1].remain_qty
                      Employee.findOneAndUpdate({                                                                                
                          _id: employee_id
                        }, {
                          $set: {
                            "remain_stock": finalStock
                          }
                        }, function (err, data) {
                          res.json({
                            status: 200
                          })
                      })
            }else{
              if(data.length==0){
                Employee.findOneAndUpdate({                                                                                
                  _id: employee_id
                }, {
                  $set: {
                    "remain_stock": 0
                  }
                }, function (err, data) {
                  res.json({
                    status:"200"
                  })
              })
              }
            }
          }
        }
      })
    });

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzE3NjMzNw_size_16_color_FFFFFF_t_70]: /images/20230810/8cf8ac24e5234d309ff413cc61419cdf.png
[20190926090000127.png]: /images/20230810/f74f265ebee1421d83f508c233c54eb6.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzE3NjMzNw_size_16_color_FFFFFF_t_70 1]: /images/20230810/423c3376d31e4141bf597e9774c333c8.png