在 Return 语句中包含 headers 和数据数组 Node.js

Question

我有一个 lambda 函数，它获取 dynamoDB table 中的所有项目，如下所示。我想知道是否有办法在 return 语句中包含响应 headers 以及“scanResults”数组。

在我当前的代码中，我可以包含 headers 或 scanResults 数组。我试过放置两个 return 语句，但这是不正确的代码。有没有办法将它们结合起来？在此先感谢您的帮助。

'use strict';
const AWS = require('aws-sdk');

exports.handler = async (event, context) => {
    const documentClient = new AWS.DynamoDB.DocumentClient();
    let responseBody = '';
    let statusCode = 0;
    let scanResults = [];
    let items;

    const params = {
        TableName: "Products"
    };

    do {
        items = await documentClient.scan(params).promise();
        items.Items.forEach((item) => scanResults.push(item));
        params.ExclusiveStartKey = items.LastEvaluatedKey;

        

    } while(typeof items.LastEvaluatedKey != "undefined");
        responseBody = JSON.stringify(items.Items);
        statusCode = 200;
        //return scanResults;


        const response = {
            statusCode: statusCode,
            headers: {
                "Content-Type": "application/json",
                "access-control-allow-origin": "*"
            },
            body: responseBody
        };
        return response;





};

Answer 1

您快完成了，只是缺少 responseBody 的错误引用 属性 :

'use strict';
const AWS = require('aws-sdk');
const documentClient = new AWS.DynamoDB.DocumentClient();

exports.handler = async (event, context) => {
    let responseBody = '';
    let statusCode = 0;
    let scanResults = [];
    let items;

    const params = {
        TableName: "Products"
    };

    do {
      items = await documentClient.scan(params).promise();
      scanResults = [...scanResults, ...items.Items];
      params.ExclusiveStartKey = items.LastEvaluatedKey;
    } while(typeof items.LastEvaluatedKey != "undefined");
    responseBody = JSON.stringify(scanResults);
    statusCode = 200;
    const response = {
        statusCode: statusCode,
        headers: {
            "Content-Type": "application/json",
            "access-control-allow-origin": "*"
        },
        body: responseBody
    };
    return response;
};