解读JSDeferred源码5

      window.onload = function(){
        var print = function(a){
          var d = document.createElement("div");
          d.innerHTML = a
          document.body.appendChild(d)
        }
        Deferred.loop(10,function(i){
          print(i)
        });
        Deferred.loop(10,function(i){
          print(String.fromCharCode(i+97));
        });
      }