Localstorage value and Access JSON, and shopping carts based on HTML5 localstorage __json

Localstorage.setitem ("Key", "value");//store variable named key, value
 
= Localstorage.key = "value"//save variable named key, value is
 
Localstorage.getitem ("key");//Gets the value of the stored variable key www.it165.net
 
localstorage.key;//Gets the value
 
of the stored variable key Localstorage.removeitem ("key")//delete stored variable named key

The above is the method called by Localstorage. The following is a description of how to store a JSON object.
var students = 
{
	liyang:{name: "Liyang", age:17},

	lilei:{name: "Lilei", age:18}

}//the JSON object to store


students = Json.stringify (students)//Converts the JSON object to a string

localstorage.setitem ("Students", students); Save the converted string with Localstorage

The JSON object is saved above, and then we retrieve the
 
var students = Localstorage.getitem ("Students") with the stored students variable when we want to use it;//Retrieve the students variable
 
students = json.parse (students);//Convert String to JSON object
 
//above to get stored students JSON object

Utils = {Setparam:function (name,value) {Localstorage.setitem (Name,value)}, Getparam:function (NA
Me) {return Localstorage.getitem (name)}} product={id:0, Name: "", num:0, price:0.00}; 
orderdetail={Username: "", Phone: "", Address: "", ZipCode: "", Totalnumber:0, totalamount:0.00}
        Cart = {//Add merchandise to cart addproduct:function (product) {var ShoppingCart = Utils.getparam ("ShoppingCart"); if (ShoppingCart = null | | ShoppingCart = = "") {//The first time to add the product var jsonstr = {"ProductList": [{"id": product.id, "name": Produc T.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;
                    Find out if the item is in the cart (var i in productlist) {if (productlist[i].id = = product.id) {
                    Productlist[i].num = parseint (productlist[i].num) + parseint (product.num);
                result = true; } if (!result) {//without the product, add directly to Productlist.push ({"id": Product.
            ID, "name": Product.name, "num": Product.num, "Price": Product.price});
            //Recalculate the total price 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;
        Save Cart Utils.setparam ("ShoppingCart", "'" + json.stringify (JSONSTR)); },//Modify the number of items to buy 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 (jso
                Nstr.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 //Get all the merchandise in the cart 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;
        //Determine if there is a commodity existproduct:function (ID) {var result = False in the shopping cart;
        var ShoppingCart = Utils.getparam ("ShoppingCart");
            if (ShoppingCart!= null) {var jsonstr = Json.parse (Shoppingcart.substr (1, shoppingcart.length));
            var productlist = jsonstr.productlist;
                for (var i-productlist) {if (productlist[i].id = = id) {result = true;
    }} return result;
        Deleteproduct:function (ID) {var shoppingcart = Utils.getparam ("ShoppingCart") of the goods in the shopping cart;
        var jsonstr = Json.parse (Shoppingcart.substr (1, shoppingcart.length)); VaR productlist = jsonstr.productlist;
        var list = []; for (var i in productlist) {if (productlist[i].id = = id) {Jsonstr.totalnumber = parseint (jso
                Nstr.totalnumber)-parseint (Productlist[i].num); Jsonstr.totalamount = parsefloat (jsonstr.totalamount)-parseint (productlist[i].num) * parsefloat (productlist[i).
            Price);
            else {List.push (productlist[i]);
        } jsonstr.productlist = list;
        Orderdetail.totalnumber = Jsonstr.totalnumber;
        Orderdetail.totalamount = Jsonstr.totalamount;
    Utils.setparam ("ShoppingCart", "'" + json.stringify (JSONSTR)); }
};

Above based on HTML5 localstorage shopping Cart JS script uses method
var product =
{
	' id ': ID,        //property name is enclosed in quotes, and attributes are separated by commas
	' name ': ' HHH ',
	' num ': JQ (' #text-4 '). Val (),
	' price ': 199.9
};
Products added to the shopping cart
cart.addproduct (product);
var productlist=cart.getproductlist ()//Take out the shopping cart product
alert (', ' Goods: ' +productlist[0].id+ ' +productlist[0].name+ ') +productlist[0].num+ ' +productlist[0].price, ' OK ');