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javascript - 完成foreach循环后如何在节点js中返回推送的数组响应？

问题描述

我正在运行一个 foreach 循环并尝试将数据发送到客户端。但是当它从循环中出来时，它给出了空数组，因为我已经全局声明了变量。我想单独推送loanid并将其作为响应返回这是我的代码片段

if (notificationType == "sms" || notificationType == "both") {
  let invalidLoanID = [];
  let text = ""
  notificationPayload.forEach((element) => {
    let checkQuery =
      "select * from loan where loanid = " + "'" + element.loanid + "'";
    sql
      .query(checkQuery)
      .then((loanResponse) => {
        // console.log("------",loanResponse)
        if (loanResponse.length == 0) {
          text = element.loanid
          invalidLoanID.push(text);
          console.log("===", invalidLoanID);
        }
        if (loanResponse.length > 0) {
          let insertQuery =
            "INSERT INTO notification " +
            "(loanid, userid, language, notificationmsg, createddt, expirydt, " +
            "notificationtype, isFailed, failureremarks,isSMSSent) VALUES " +
            "(" + 
            "'" +
            element.loanid +
            "'," +
            "'" +
            element.userid +
            "'," +
            "'" +
            element.langauge +
            "'," +
            "'" +
            "Loan no:"+ element.loanid +"; " + element.notificationMsg +
            "'," +
            "'" +
            element.createdate +
            "'," +
            "'" +
            element.expiryDate +
            "'," +
            "'" +
            element.notificationType +
            "'," +
            +element.isFailed +
            ", '" +
            element.failureremarks +
            "', 0" +")";
        }
      })
      .catch((err) => {
        res.status(400).json({
          status: 400,
          message: err,
        });
      });
      }) 
  })
}

res.status(200).send({ response: "Success", message: "消息发送成功", invalidLoanID : invalidLoanID

标签： javascriptmysqlnode.jsarraysforeach

解决方案

尝试使用异步/等待。

基本上，当您使用 .then() 处理 Promises 时，您的代码不会等待您的 Promise 被解析。然后，您的代码在“res.status(200).send...”之前传递，并且在您的 Promise 在您的 .then() 中解决之后

使用 async/await 你可以“强制”你的代码等待这个 Promise 被解决。

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