concat json结果在节点js

Question

我正在写一个节点程序，执行下面的操作。

• 扫描DynamoDB并获取结果。
• 根据结果做到以下几点。
  • 如果返回值的大小为1. console.log的值。
  • 如果结果超过1个concat结果并打印到控制台。 目前我能够得到结果并在控制台中打印。如果它大于1，我很困惑我该怎么做。

以下是我的代码。

function getMyDueResponses(response, session) { 
var responseText=''; 
    console.log('Here is your result' + session.attributes.userData.Count); 
    console.log(session.attributes.userData.length); 
    if (session.attributes.userData.Count < 2) { 
    var res = session.attributes.userData; 
    var userDueDate = JSON.stringify(res.Items[0].dueDate); 
    var userDueAmount = JSON.stringify(res.Items[0].dueAmount); 
    var userTotalBalance = JSON.stringify(res.Items[0].totalBalance); 
    responseText = `Your next Chubb bill is due on ${userDueDate}. The payment due is ${userDueAmount}$. The full account balance is ${userTotalBalance}$.`; 
    console.log(responseText); 
} 
    else { 
    //Here I'm stuck on how to proceed. 
    } 
} 

例如。 数据库返回了下面的数据。

{ 
    "Items": [ 
     { 
      "accountId": "12345", 
      "pin": "1234", 
      "userId": "user1", 
      "dueDate": "5/20/2017", 
      "_id": "2", 
      "dueAmount": "4000", 
      "totalBalance": "10000" 
     } 
    ], 
    "Count": 1, 
    "ScannedCount": 4 
} 

响应应该是。我能够得到这个结果。

Your bill is due on 5/20/2017. The payment due is 4000$. The full account balance is 10000$. 

db返回了下面的数据。

{ 
    "Items": [ 
     { 
      "accountId": "12345", 
      "pin": "1234", 
      "userId": "user1", 
      "dueDate": "5/20/2017", 
      "_id": "2", 
      "dueAmount": "4000", 
      "totalBalance": "10000" 
     }, 
     { 
      "accountId": "12345", 
      "pin": "1234", 
      "userId": "user1", 
      "dueDate": "5/23/2017", 
      "_id": "2", 
      "dueAmount": "1000", 
      "totalBalance": "10000" 
     }, 
     { 
      "accountId": "12345", 
      "pin": "1234", 
      "userId": "user1", 
      "dueDate": "5/24/2017", 
      "_id": "2", 
      "dueAmount": "300", 
      "totalBalance": "10000" 
     } 
    ], 
    "Count": 3, 
    "ScannedCount": 4 
} 

以下数据必须打印在console.log()。

Your bill 1 is due on 5/20/2017. The payment due is 4000$. The full account balance is 10000$. Your bill 2 is due on 5/23/2017. The payment due is 1000$. The full account balance is 10000$. Your bill 3 is due on 5/24/2017. The payment due is 300$. The full account balance is 10000$. 

请让我知道我该怎么做。

Answer 1

为什么你不运行一个循环的项目数量？编辑：您可以在循环时将每个响应添加到数组中，然后使用Reduce（）将该数组打印为单个字符串。

var arr = []; 
    var res = session.attributes.userData; 


    for (var x = 0; x < session.attributes.userData.Count; x++) { 

     var userDueDate = JSON.stringify(res.Items[x].dueDate); 
     var userDueAmount = JSON.stringify(res.Items[x].dueAmount); 
     var userTotalBalance = JSON.stringify(res.Items[x].totalBalance); 
     responseText = `Your next Chubb bill is due on ${userDueDate}. The payment due 
     is ${userDueAmount}$. The full account balance is ${userTotalBalance}$.`; 
     arr.push(responseText); 
    } 

console.log(arr.reduce(function(acc, cur) { return acc + cur; }