var input = $("#J_autocomplete");

             var fn = function(){

                 // console.log('value changed')

             }

             input.bind('input.autocomplete',fn)

                 .bind('propertychange.autocomplete',function(e){

                     if(e.originalEvent.propertyName && e.originalEvent.propertyName == 'value'){

                         fn.call(this,e);

                     }

                 });

             //ie9支持addEventListener，ie10开始支持FileReader api

             if(documnt.all && typeof FileReader === 'undefined' && window.addEventListener){

                 //退格与删除

                 input.bind("keydown.autocomplete", function(e) {

                     var key = e.keyCode;

                     (key == 8 || key == 46) && $(this).trigger('input.autocomplete');

                 });

                 //剪切

                 input.bind("cut.autocomplete", function(e){

                     $(this).trigger('input.autocomplete')

                 });

             }