数据日志并发送到服务器

JSON Data log and sent to server

本文关键字：服务器并发日志数据更新时间：2023-09-26

我有一个javascript函数，它每隔一秒生成JSON数据，然后把它放到云服务器上。现在我不想实时POST，而是希望将此数据记录在缓冲区中，并在n个数据日志之后将PUT到云端。例如，我想在10秒内记录50个数据点然后使用时间戳将PUT到服务器

现在JSON数据通过var fromDatan传递。JSON数据格式为

{"value":"-2.1282838391939194"}

现在代码是:

var acc;
    var watchID = null;
function startWatch() {
            //set frequency of accelerometer update.1000 = 1 second
            var options = { frequency: 1000 };
            watchID = navigator.accelerometer.watchAcceleration(onSuccess, onError, options);
        }

    function stopWatch() {
            if (watchID) {
            navigator.accelerometer.clearWatch(watchID);
            watchID = null;
            }
        }

    //DISPLAY ACCELERATION DATA
    function onSuccess(acceleration) {
            acc = acceleration;
            var element = document.getElementById("accelerometer");
            element.innerHTML = 'Acceleration X: ' + acceleration.x         + '<br />' +
                              'Acceleration Y: ' + acceleration.y         + '<br />' +
                              'Acceleration Z: ' + acceleration.z         + '<br />' +
                              'Timestamp: '      + acceleration.timestamp + '<br />';
                datalock();

        }

    function postdata () {
        var accx = acc.x;
        alert(accx);


            var fromDatan = JSON.stringify(fromData);
                alert(fromDatan);
                //POST JSON  DATA
                $.ajax({
                url: "http://abcd.com",
                headers: {
                    "X-API-KEY": "2b9asdedqedqxdqd7956e6f7a",
                    "Content-Type": "application/json"
                },
                type: "PUT",
                data: fromDatan,
                dataType: "JSON",
                success: function(fromData, status, jqXHR) {
                    alert(JSON.stringify(fromData));
                },
                error: function(jqXHR, status) {
                    alert(JSON.stringify(jqXHR));
                }
                });
                return false;
        }
        function datalock(){
            alert("Entering");
            fromData.push({
                value: accx.toString(),
            });
            if (fromData.length >= 10) {
                postdata ();
            };
        var fromData;
        }

它不工作，虽然所有其他的事情都是正确的，推动我不能正确实现。有人能帮帮我吗?

EDIT START

试试这个:

var fromData = [];
var jsonCounter = 0;
function postdata () {
    var accx = acc.x;
    alert(accx);
    var fromDatan = JSON.stringify(fromData);
    alert(fromDatan);
    $.ajax({
    url: "http://abcd.com",
    headers: {
        "X-API-KEY": "2b9asdedqedqxdqd7956e6f7a",
        "Content-Type": "application/json"
    },
    type: "PUT",
    data: fromDatan,
    dataType: "JSON",
    success: function(fromData, status, jqXHR) {
        alert(JSON.stringify(fromData));
    },
    error: function(jqXHR, status) {
        alert(JSON.stringify(jqXHR));
    }
    });
    return false;
}
function datalock(){
    alert("Entering");
    fromData.push({
        value: accx.toString(),
    });
    jsonCounter++;
    // post only after 10 entries
    if (jsonCounter >= 10) {
    postdata ();
    jsonCounter = 0; // reset
    };
}

<<p> 编辑结束/strong>

由于JSON对象没有length属性，您可以通过使用变量来实现。

的例子:

var formdata;
var jsonCounter = 0;
function datalock(){
    alert("Entering");
    fromData.push({
        value: accx.toString(),
    });
    jsonCounter++;
    // post only after 50 entries
    if (jsonCounter >= 50) {
        postdata ();
        jsonCounter = 0; // reset
    };
    //var fromData; // make it global as it is used in other function.
}

根据@web-nomad

的建议修改后的代码

    function postdata () {
            var accx = acc.x;
            alert(accx);


                var fromDatan = JSON.stringify(fromData);
                    alert(fromDatan);
                    //POST JSON SENSOR DATA
                    $.ajax({
                    url: "http://abcd.com",
                    headers: {
                        "X-API-KEY": "2b9e259asdasd6a7956e6f7a",
                        "Content-Type": "application/json"
                    },
                    type: "PUT",
                    data: fromDatan,
                    dataType: "JSON",
                    success: function(fromData, status, jqXHR) {
                        alert(JSON.stringify(fromData));
                    },
                    error: function(jqXHR, status) {
                        alert(JSON.stringify(jqXHR));
                    }
                    });
                    return false;
            //var fromData = {};
            }
            var fromData = [];
            var jsonCounter = 0;
//Edit start
            function datalock() {
            alert("Entering");
            //alert(jsonCounter); //It was showing me only count as 0
            fromData.push({
            value: accx.toString(),
            });
            alert(JSON.stringify(fromData));// no alert
            jsonCounter++;
            alert(jsonCounter); //The alert was not coming at all, when I tried this one
            // post only after 10 entries
            if (jsonCounter >= 10) {
            postdata ();
            jsonCounter = 0; // reset
            };
        }
//Edit End

这是在你给@web-nomad

的建议之后的变化