2025年国开电大 JavaScript程序设计 实训六：设计简单的购物车.pdfVIP

操千曲尔后晓声，观千剑尔后识器。——刘勰

国开电大JavaScript程序设计实训六：

设计简单的购物车

Designasimpleshoppingcart.

Thepurposeofthisprojectisto(1)mastertheuseofJSON。

(2)masterthedynamicnmethodofdatalists。(3)mastertheuse

ofWebStorage。and(4)beabletodesignsimplensusingthe

knowledgelearned.

ThecontentofthisprojectistodesignaproductbrowsingThecontentofthisprojectistodesignaproductbrowsing

productstotheshoppingcartanddisplaytheshoppingcart。Users

canalsoperformadd。subtract。ordeletensontheproductsin

theshoppingcart.

Therequirementsareto(1)designaproductlistforaspecific

n。(2)dynamicallygeneratetheproductandshoppingcartdata

list。and(3)storetheshoppingcartdatainWebStorage.

饭疏食，饮水，曲肱而枕之，乐亦在其中矣。不义而富且贵，于我如浮云。——《论语》

Hereisanexampleofthecode:

publicbooleanaddGoodsInCart(Itemsitem。intnumber){

if(XXX(item)){

goods.put(item。goods.get(item)+number);

else{

goods.put(item。number);

calTotalPrice()。//Recalculatethetotalpriceoftheshopping

cart

returntrue;

publicbooleanremoveGoodsFromCart(Itemsitem){

goods.remove(item);

calTotalPrice()。//Recalculatethetotalpriceoftheshopping

cart

returntrue;

志不强者智不达，言不信者行不果。——墨翟

publicdoublecalTotalPrice(){

doublesum=0.0;

SetXXX()。//Getthekeyset

XXXit=keys.iterator()。//Gettheiteratorobject

while(it.hasNext()){

Itemsi=it.next();

sum+=i.getPrice()*good