forloop_jquery_callback.js

(function(){
  var i = 0;
  function forloop(){
    if(i<5){
      $.getJSON('/data'+i+'.json', function(data) {
        console.log("yay! Data"+i+" is ready!");
        i++;
        forloop();
      });
    }else{
      console.log("all done");
    }
  }
  forloop();
})();