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下一篇 2015-08-16 18:49:39
/ 个人分类：JavaScript
Instruction :
Modify the scan method such that if we tell it the quantity of each item, it will be able to add the right amount to the total. Since you currently tell scan nothing about quantity, it may be useful to create another parameter.
Scan 4 of each item using your improved scan method. Previously we would have needed to call scan16 times! Now it is down to 4.
var cashRegister = {
total:0,
add: function(itemCost){
this.total += itemCost;
},
scan: function(item,time) {
switch (item) {
case "eggs": this.add(0.98 * time); break;
case "milk": this.add(1.23 * time); break;
case "magazine": this.add(4.99 * time); break;
case "chocolate": this.add(0.45 * time); break;
}
}
};
// scan each item 4 times
var myArr = ["eggs","milk","magazine","chocolate"];
for ( var m = 0;m <= myArr.length - 1 ; m++ ) {
cashRegister.scan(myArr[m],4);
};
//Show the total bill
console.log('Your bill is '+cashRegister.total);
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