将ajax响应数据存储到数组中并将其与最后的值进行比较

I am stuck with these. I want to create a function to be run every 4secs. Now My function will get all the queue_id from my database and store it in array again and again, after storing it, i will compare it again and again every 4 secs, if there are changes , then i will do something.

Example execution : If my database response with queue_id's: 1,2,3,4,5 then i will store these data from an array. After storing it, i will query again evry 4 seconds if it returns 1,2,4,5 or 1,2,3,5 i will do something, but if it returns thesame like 1,2,3,4,5 then i will not do something.

I have no idea how to store or create array in javascript . Please help me:

function check_getqueue(clinicID, userID) {
  $.ajax({
    url: siteurl+"sec_myclinic/checkingUpdates/"+clinicID+"/"+userID,
    type: "POST",
    dataType: "JSON",
    success: function(data) {
      for(var i=0;i<data.length;i++) {
        var tmpCountQ = data[i]['queue_id'];
      };

      if (tmpCountQ < lastcountQueue) { 

      }
      lastcountQueue = tmpCountQ;
    }
  });
}

Use push, and declare the array outside the ajax request. now all working

function check_getqueue(clinicID, userID) {
  var tmpCountQ = [];
  var lastCon = [];
  $.ajax({
    url: siteurl+"sec_myclinic/checkingUpdates/"+clinicID+"/"+userID,
    type: "POST",
    dataType: "JSON",
    success: function(data) {
      for(var i=0;i<data.length;i++) {
        tmpCountQ.push(data[i]['queue_id']);
      };
      if(typeof lastCon[0] != "undefined")
      {
        for(j=0;j < tmpCountQ.length;j++)
        {
          if(tmpCountQ[j] != lastCon[j])
          {
            lastCon[j] = tmpCountQ[j];
          } 
        }
      }
      else
      {
       lastCon = tmpCountQ;
      }

      console.log(tmpCountQ);
    }
  });
}

You need to keep track of the lastly received set of ids and compare them with the new ones. When a difference found, call your doSomething() and update the record for next run.

To get things faster you can first check the lengths. More info in the comment blocks below.

var previousQueueIDs = [];

function doSomething() {
  // do something
  // ...
  // set timer for the next run
  setTimeout(check_getqueue, 4000);
}

function check_getqueue(clinicID, userID) {
  $.ajax({
    url: siteurl+"sec_myclinic/checkingUpdates/"+clinicID+"/"+userID,
    type: "POST",
    dataType: "JSON",
    success: function(data) {
      var queueIDs = [];
      if(previousQueueIDs.length != data.length) {
        previousQueueIDs = queueIDs;
        return doSomething();
      }
      // length didn't change, so check further
      // create new array for the current values
      for(var i=0;i<data.length;i++) {
        queueIDs.push(+data[i]['queue_id']);
      };

      // sort them for faster comparison
      queueIDs.sort( function(a,b) {
        return a-b;
      });

      // check one by one and exit to run doSomething
      // as soon as the first difference found
      for(var i=0; i<queueIDs.length; i++) {
        if(queueIDs[i] != previousQueueIDs[i]) {
          previousQueueIDs = queueIDs;
          return doSOmething();
        }
      }
      // no difference this time, just set timer for the next run
      setTimeout(check_getqueue, 4000);
    }
  });
}