jquery UI autocomplete 获取焦点时显示列表

function dynamicAutocomplete(){
            $("#search").autocomplete({
            minLength: 0,
            source: data,
            focus :function () {                     
               return false;
            },
            select: function(event, ui){            
            $this = $(this);
            setTimeout(function () {               
                $this.blur();
               }, 1);
          }
            }).focus(function(){
                 $(this).autocomplete("search");
                 return false;
            }    
        );
    };