javascript - two set interval function in single PHP file is not working -

function updatechatajax1() {     var ajaxrequest;  // variable makes ajax possible!      ajaxrequest = new xmlhttprequest();         // create function receive data sent server         ajaxrequest.onreadystatechange = function(){         if(ajaxrequest.readystate == 4){          //the response         document.getelementbyid('content1').innerhtml = ajaxrequest.responsetext;         }     }     ajaxrequest.open("get", "open_ajax.php?mode=ref", true);      ajaxrequest.send(null);  }   $(function(){      setinterval(function () {          updatechatajax1(); // javascript function request ajax file.      }, 2000); });  $(function(){      setinterval(function () {          updatechatajax(); // javascript function request ajax file.      }, 2000); }); 

when page loaded both functions updatechatajax() , updatechatajax1() working together. want call 1 function @ time of time interval.

when loading execute both operations together.

updatechatajax();  updatechatajax1(); 

then setinterval both actions

   var flag=0;     $(function(){          setinterval(function () {            if(flag==0)            {              updatechatajax();              }           else            {              updatechatajax1();             }          }, 2000);     }); 

change flag choose operation.

flag=0 -> updatechatajax();  

and

flag=1 -> updatechatajax1();