Question

我将Node.js和Express一起用于后端服务器。我以json的形式发送一些数据，解析之后，我试图遍历该对象，以便我可以分配值。为了进行测试，我传入了一个包含50个对象的对象。

我已经尝试过在hasOwnProperty中使用for in循环，但是它从未完成所有操作。

for (i in req.body.deviceObject) {
    if (req.body.deviceObject.hasOwnProperty.call(req.body.deviceObject[i].dId, i)) {
      newVcsObject[i] = new PQ(
        'insert into VCS(ip_address, vcs_name, user_name, user_password, ID) values ($1, $2, $3, $4, $5)'
      );
      newVcsObject[i].values = [
        req.body.deviceObject[i].ipAddress,
        req.body.customerName,
        req.body.deviceObject[i].uName,
        req.body.deviceObject[i].uPassword,
        req.body.deviceObject[i].VCSID
      ];
      console.log(i);
      count += 1;
    }
}

edit: this is my data structure:
"deviceObject": {
        "1": {
            "rId": "e43aebb5-234f-4aa6-a666-90179df767bc",
            "e164": "449bc7cc-90fa-4b9e-b4c1-1223d825d545",
            "uName": "Server",
            "uPassword": "admin",
            "VCSID": "54191576-47ea-4055-8ea4-bc201dc54f6d",
            "ipAddress": "1.1.1.1",
            "dId": "b6178041-86cc-4959-9155-54ca419083e7"
        },
        //there are more in between, this is where it's stuck
        "35": {
            "rId": "dce82b00-fa1e-46b8-a3f6-1a5af45175de",
            "e164": "7cc8190b-c261-40f8-9f62-408f7e8b2450",
            "uName": "access point",
            "uPassword": "admin",
            "VCSID": "3e3e447c-b9fe-4997-ba54-225175b0a84b",
            "ipAddress": "1.1.1.1",
            "dId": "9c97d5a5-b26f-492e-ba5b-bdd33eb3cb30"
        }
        // goes all the way to 50

我总是输入35/50。我已经仔细检查过，服务器可以正常接收所有50个消息，但是它只会循环访问前35个消息。

Answer 1

const deviceObject = {
  1: {
    rId: 'e43aebb5-234f-4aa6-a666-90179df767bc',
    e164: '449bc7cc-90fa-4b9e-b4c1-1223d825d545',
    uName: 'Server',
    uPassword: 'admin',
    VCSID: '54191576-47ea-4055-8ea4-bc201dc54f6d',
    ipAddress: '1.1.1.1',
    dId: 'b6178041-86cc-4959-9155-54ca419083e7',
  },
  35: {
    rId: 'dce82b00-fa1e-46b8-a3f6-1a5af45175de',
    e164: '7cc8190b-c261-40f8-9f62-408f7e8b2450',
    uName: 'access point',
    uPassword: 'admin',
    VCSID: '3e3e447c-b9fe-4997-ba54-225175b0a84b',
    ipAddress: '1.1.1.1',
    dId: '9c97d5a5-b26f-492e-ba5b-bdd33eb3cb30',
  },
};
const custName = 'dummy'; // req.body.customerName;
const array = [];

Object.keys(deviceObject).forEach((r) => {
  const text = 'insert into VCS(ip_address, vcs_name, user_name, user_password, ID) values ($1, $2, $3, $4, $5)';
  const vals = deviceObject[r];
  const values = [vals.ipAddress, custName, vals.uName, vals.uPassword, vals.VCSID];
  const obj = {
    text,
    values,
  };
  array.push(obj);
});

console.log(array);

Answer 2

所以这不是一个完整的答案，但是我希望这将有助于您的调试。

如果您的for循环已终止，则意味着它已成功遍历每个对象。如果您想知道为什么未正确解析新的VcsObject，那么if语句似乎不会成功。尝试将else语句与日志一起使用，以查看if语句是否在您中发生任何故障，以便说明所有控制逻辑。

for (i in req.body.deviceObject) {
    if (req.body.deviceObject.hasOwnProperty.call(req.body.deviceObject[i].dId, i)) {
      newVcsObject[i] = new PQ(
        'insert into VCS(ip_address, vcs_name, user_name, user_password, ID) values ($1, $2, $3, $4, $5)'
      );
      newVcsObject[i].values = [
        req.body.deviceObject[i].ipAddress,
        req.body.customerName,
        req.body.deviceObject[i].uName,
        req.body.deviceObject[i].uPassword,
        req.body.deviceObject[i].VCSID
      ];
      console.log(i);
      count += 1;
    } else {
        // Log when the if-statement fails to execute
        console.log("Warning! If statement failed on iteration " + i)
    }
}

如果您的for循环从未终止并挂断，则表示您有一些永不返回的函数。我不确定这是否是您的情况，但是您将需要编写多个日志语句以查看失败之处，或者知道哪个函数可能从未返回过。

for (i in req.body.deviceObject) {
    console.log("Iteration: " + i)
    console.log("checking hasOwnProperty")
    if (req.body.deviceObject.hasOwnProperty.call(req.body.deviceObject[i].dId, i)) {
      console.log("Assigning a new PQ object")
      newVcsObject[i] = new PQ(
        'insert into VCS(ip_address, vcs_name, user_name, user_password, ID) values ($1, $2, $3, $4, $5)'
      );
      console.log("Assigning newVcsObject values")
      newVcsObject[i].values = [
        req.body.deviceObject[i].ipAddress,
        req.body.customerName,
        req.body.deviceObject[i].uName,
        req.body.deviceObject[i].uPassword,
        req.body.deviceObject[i].VCSID
      ];
      console.log(i);
      count += 1;
    } else {
        // Log when the if-statement fails to execute
        console.log("Warning! If statement failed on iteration " + i)
    }
}

对于循环而言，不会遍历对象的每个项目

2 个答案: