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function getData1 (){   
   return $.get('/page1.php');
}
function getData2 (){   
   return $.get('/page2.php');
}
function getData3 (){   
   return $.get('/page3.php');
}
 
$.when(getData1(),getData2(),getData3()).done(function(r1,r2,r3){
   console.log(r1) //[data, status, xhrObj]
   console.log(r2) //[data, status, xhrObj]
   console.log(r3) //[data, status, xhrObj]
})