基于html5 localStorage的购物车JS脚本
最近在做html5这一块，参考网上的代码写了一个购物车JS脚本，很简单，直接上代码，shoppingCart.js：
[javascript]
utils = {
setParam : function (name,value){
localStorage.setItem(name,value)
},
getParam : function(name){
return localStorage.getItem(name)
}
}
product={
id:0,
name:"",
num:0,
price:0.00,
};
orderdetail={
username:"",
phone:"",
address:"",
zipcode:"",
totalNumber:0,
totalAmount:0.00
}
cart = {
//向购物车中添加商品
addproduct:function(product){
var ShoppingCart = utils.getParam("ShoppingCart");
if(ShoppingCart==null||ShoppingCart==""){
//第一次加入商品
var jsonstr = {"productlist":[{"id":product.id,"name":product.name,"num":product.num,"price":product.price}],"totalNumber":product.num,"totalAmount":(product.price*product.num)};
utils.setParam("ShoppingCart","'"+JSON.stringify(jsonstr));
}else{
var jsonstr = JSON.parse(ShoppingCart.substr(1,ShoppingCart.length));
var productlist = jsonstr.productlist;
var result=false;
//查找购物车中是否有该商品
for(var i in productlist){
if(productlist[i].id==product.id){
productlist[i].num=parseInt(productlist[i].num)+parseInt(product.num);
result = true;
}
}
if(!result){
//没有该商品就直接加进去
productlist.push({"id":product.id,"name":product.name,"num":product.num,"price":product.price});
}
//重新计算总价
jsonstr.totalNumber=parseInt(jsonstr.totalNumber)+parseInt(product.num);
jsonstr.totalAmount=parseFloat(jsonstr.totalAmount)+(parseInt(product.num)*parseFloat(product.price));
orderdetail.totalNumber = jsonstr.totalNumber;
orderdetail.totalAmount = jsonstr.totalAmount;
//保存购物车
utils.setParam("ShoppingCart","'"+JSON.stringify(jsonstr));
}
},
//修改给买商品数量
updateproductnum:function(id,num){
var ShoppingCart = utils.getParam("ShoppingCart");
var jsonstr = JSON.parse(ShoppingCart.substr(1,ShoppingCart.length));
var productlist = jsonstr.productlist;
for(var i in productlist){
if(productlist[i].id==id){
jsonstr.totalNumber=parseInt(jsonstr.totalNumber)+(parseInt(num)-parseInt(productlist[i].num));
jsonstr.totalAmount=parseFloat(jsonstr.totalAmount)+((parseInt(num)*parseFloat(productlist[i].price))-parseInt(productlist[i].num)*parseFloat(productlist[i].price));
productlist[i].num=parseInt(num);
orderdetail.totalNumber = jsonstr.totalNumber;
orderdetail.totalAmount = jsonstr.totalAmount;
utils.setParam("ShoppingCart","'"+JSON.stringify(jsonstr));
return;
}
}
},
//获取购物车中的所有商品
getproductlist:function(){
var ShoppingCart = utils.getParam("ShoppingCart");
var jsonstr = JSON.parse(ShoppingCart.substr(1,ShoppingCart.length));
var productlist = jsonstr.productlist;
orderdetail.totalNumber = jsonstr.totalNumber;
orderdetail.totalAmount = jsonstr.totalAmount;
return productlist;
},
//判断购物车中是否存在商品
existproduct:function(id){
var ShoppingCart = utils.getParam("ShoppingCart");
var jsonstr = JSON.parse(ShoppingCart.substr(1,ShoppingCart.length));
var productlist = jsonstr.productlist;
var result=false;
for(var i in productlist){
if(productlist[i].id==product.id){
result = true;
}
}
return result;
},
//删除购物车中商品
