req.onsuccess()=function(){???var cursor = this.result;???if(cursor){????var value = {?????id:cursor.value.id,? //？？？？？？？？？？?????code:data.Code,?????date:data.Date,?????goodscode:data.GoodsCode,?????brandName:data.BrandName,?????num:data.Num,?????price:data.Price,?????personName:data.PersonName,?????email:data.Email????};?????? cursor.update(value);???}??? }其中 cursor.value.id? 是什么？游標的value屬性介紹一下，還有id具體代表什么，麻煩解釋下，小弟謝過啦！！