如何使用node.js request（）循环数组

Question

我从传递单个值到我的节点API到传递多个值，API停止发送响应。

字段的单个值示例：

tracking: "123", // Only one tracking number
carrier: "usps" // Only one carrier code

字段的多个值的示例：

tracking: [ '9361289691090998780363', '784644233417' ],
carrier: [ 'usps', 'fedex' ]

我想我需要添加某种循环，但是我无法弄清楚如何做到这一点，也不知道正确的术语是什么。这与aync有关吗？我迷路了。

request(options, function (error, response, body){});

这是我的代码。任何帮助/补充信息都会对我理解我做错了什么感激不尽。

html.js

// These are sent over in an AJAX call //
var trackingNumber = ['9361289691090998780363', '784644233417'];
var carrierCode = ['usps', 'fedex'];

controller.js

app.get("/api/tracking/retrieve", (req, res) => {

    var carrier = req.query.carrier;
    var tracking = req.query.tracking;

    console.log('carrier array', carrier);
    console.log('tracking array', tracking);

    var options = {
        method: "GET",
        url: 'https://api.example.com/v1/tracking',
        qs: { carrier_code: carrier, tracking_number: tracking },
        headers:
            {
                'api-key': process.env.SECRET_KEY_SE,
                'accept': 'application/json'
            }
    }

    console.log("Url: ", req.url);
    console.log("Query: ", req.query);
    // res.send("ok");

    request(options, function (error, response, body) {
        if (!error && response.statusCode == 200) {
            console.log('BODY', body)

            var trackingData = JSON.parse(body)
            console.log('trackingData: ', trackingData);
            table = 'tracking_table';
            col = [
                'user_id',
                'tracking_number',
                'carrier_code',
            ];

            val = [
                user_id,
                trackingData.tracking_number,
                options.qs.carrier_code,
            ];

            main.create(table, col, val, function (data) {
                res.json({
                    id: data.insertId,
                    user_id: user_id,
                    tracking_number: data.tracking_number,
                    carrier_code: data.carrier_code,
                });
            })
        }
    })

})

Answer 1

从您的控制器我实际上可以看到，只要您收到请求，您就会发回响应。你怎么能再次发送回复？

我已经评论了你的res.send（'ok'）并且它有效。

app.get("/api/tracking/retrieve", (req, res) => {
    var carrier = req.query.carrier;
    var tracking = req.query.tracking;
    console.log('carrier array', carrier);
    console.log('tracking array', tracking);
    var options = {
        method: "GET",
        url: 'https://api.example.com/v1/tracking',
        qs: { carrier_code: carrier, tracking_number: tracking },
        headers:
            {
                'api-key': process.env.SECRET_KEY_SE,
                'accept': 'application/json'
            }
    }
    console.log("Url: ", req.url);
    console.log("Query: ", req.query);
    // res.send("ok"); <--
    request(options, function (error, response, body) {
        if (!error && response.statusCode == 200) {
            console.log('BODY', body)
            var trackingData = JSON.parse(body)
            console.log('trackingData: ', trackingData);
            table = 'tracking_table';
            col = [
                'user_id',
                'tracking_number',
                'carrier_code',
            ];
            val = [
                user_id,
                trackingData.tracking_number,
                options.qs.carrier_code,
            ];
            main.create(table, col, val, function (data) {
                res.json({
                    id: data.insertId,
                    user_id: user_id,
                    tracking_number: data.tracking_number,
                    carrier_code: data.carrier_code,
                });
            })
        }
    })
});