javascript - Get changes in JQuery Ajax request -

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my apologies if seems dumb, how implement function when ajax data changed last request?

window.setinterval(function(){     $.get("feed", function(data){          if (data.changed) {              $('#feed').html(data);          }     }); }, 500);

something cache data , compare after each request?

var data;  window.setinterval(function(){     $.get("feed", function(newdata){          if (data !== newdata) {             data = newdata;             $('#feed').html(data);          }     }); }, 500);

also, 500ms regular checking requests, i'd advise changing 5000ms or something.


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