javascript - why js can Improved code efficiency use function? -

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when use mongodb in js,i found code's efficiency different between example1(122ms) , example2(390ms),example1 put code in function() example2 not. why?

example1:

var timepage2 = function(){     var start = (new date()).gettime();     var page1;     for(var i= 0; < 10000; i++){                     page1 = db.test.find({"n":{"$gt":i*100}}).limit(100);      }     var end = (new date()).gettime();     var timediff = end - start;      print("update took2:" + timediff+"ms"); }  timepage2()

example2:

 //var timepage2 = function(){     var start = (new date()).gettime();     var page1;     for(var i= 0; < 10000; i++){                     page1 = db.test.find({"n":{"$gt":i*100}}).limit(100);      }     var end = (new date()).gettime();     var timediff = end - start;      print("update took2:" + timediff+"ms"); //    }  //     timepage2()


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