for循环添加元素比较效率的方式

for (var i in retd.str) {               
                trs.push(
                '<div class="merchandiseDisplay" onclick="go_win(\'commodityDetailsPage.html\',{\'pid\':\'' + retd.str[i].id + '\',\'shopid\':'+ pageParam.shopid +'});" tapmode ">'+
                    '<img class="artic_img" src="'+retd.str[i].image+'" alt=""  />' +
                    '<p class="spname">'+retd.str[i].name+'</p>'+
                    '<p>'+
                    '<span>'+ retd.str[i].sellPrice+'幸福币' +'</span>'+
                    '<button class="goshop">'+'去抢购' +'</button>'+
                    '</p></div>'
                        );
                }
                $(".merchan").append(trs.join(""));