javascript - Continuous ajax calls makes application crash -


i have html application contains 4 ajax calls runs continously every 2 seconds back. objective read new , fresh data fron db continuously , seamlessly. 

 function messagesreceived(){   var querystring = "xxxxxxxxx";   $.ajax({   url:querystring,   'content-type':'application/json',    method:'get',    datatype:'json',    cache: false,    success:function(data){    displaymessages(data);    rendermessagesreceived();    },   complete: function(xhr,status){   settimeout(messagesreceived,2000);   },  error: function(xhr,status){  if(xhr.status == 0){  footertext.settext("network disconnected"); }else{     footertext.settext("something went wrong! please reload   page!");  }   }    }); }      function loadreadings() {  var querystring = "xxxxxxx"; $.ajax({     url: querystring,     'content-type': 'application/json',     method: 'get',     datatype: 'json',     cache: false,     success: function(data) {         mapreadings(data);         plotreadings();     },     complete: function(xhr, status) {         settimeout(loadreadings, 2000);     },     error: function(xhr, status) {         if (xhr.status == 0) {             footertext.settext("network disconnected");         } else {             footertext.settext("something went wrong! please reload page!");         }      }   }); }   function loadreadings2() { var querystring = "xxxxx"; $.ajax({     url: querystring,     'content-type': 'application/json',     method: 'get',     datatype: 'json',     cache: false,     success: function(data) {         initiate(data);         footertext.settext("");     },     complete: function(xhr, status) {         settimeout(loadreadings2, 2000);     },     error: function(xhr, status) {          if (xhr.status == 0) {             footertext.settext("network disconnected");         } else {             footertext.settext("something went wrong! please reload page!");         }      }   }); }

its runs fine first 15/20 mins , crashes. below link screenshot of error.

app crashing error]

can please suggest how resolve this. critical issue have been facing past 15 days. googled solution no luck.

appreciate time , help.

thanks.


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