Javascript设置超时循环

Question

I have a function that reads data from Web Sql and sends it to web service to insert data into SQL Server. All would be nice and easy if not the fact that it takes about 40 seconds for the web service to process all the information. I have set a timeout on sending data out to web service but it does not seems to be working....When I have more than one row in a table it sends out only the first row and skips the remaining ones, so it means that timeout does not work. Any help appreciated.

        db2.transaction(function (tx) {
        tx.executeSql('SELECT * FROM offlineCabinDefects', [], function (tx, results) {
            var len = results.rows.length, i;
            for (i = 0; i < len; i++) {

                var airline = results.rows.item(i).Airline;
                var tail = results.rows.item(i).Tail;
                var fn = results.rows.item(i).FlightNumber;
                var ad = results.rows.item(i).ActionDate;
                var ca = results.rows.item(i).CabinArea;
                var ci = results.rows.item(i).CabinItem;
                var uf = results.rows.item(i).UnserviceableFlag;
                var rn = results.rows.item(i).RowNumber;
                var sn = results.rows.item(i).SeatNumber;
                var dscr = results.rows.item(i).Description;
                var r = results.rows.item(i).Revision;
                var user = results.rows.item(i).UserName;
                var pass = results.rows.item(i).Password;

                data2 = "{'Airline':'" + airline +
                            "','Tail':'" + tail +
                            "','FlightNumber':'" + fn +
                            "','ActionDate':'" + ad +
                            "','CabinArea':'" + ca +
                            "','CabinItem':'" + ci +
                            "','UnserviceableFlag':'" + uf +
                            "','RowNumber':'" + rn +
                            "','SeatNumber':'" + sn +
                            "','Description':'" + dscr +
                            "','Revision':'" + r +
                            "','UserName':'" + user +
                            "','Password':'" + pass + "'}";


                 setTimeout(sendWS(data2), 50000);
            }
            dropTable2();
            document.getElementById("offlineresult").innerHTML = ('');
            document.getElementById("offlinetbl").innerHTML = ('');
        });
    });
}

Answer 1

Your function within the timeout is being executed immediately! If you're passing params, wrap it in an anonymous function else it will be executed immediately!

setTimeout(function() {
    sendWS(data2)
}, 50000);