意外的令牌"("JavaScript

Question

我检查了所有的括号,看起来对我来说没问题,这是什么交易？(我在Codecademy上做Javascript课程)[随机文本在这里,因为stackoverflow希望我在文本和代码之间有更好的比例]

function StaffMember(name,discountPercent){
    this.name = name;
    this.discountPercent = discountPercent;
}

var sally = new StaffMember("Sally",5);
var bob = new StaffMember("Bob",10);

// Create yourself again as 'me' with a staff discount of 20%
var me = new StaffMember("Axel", 20);

var cashRegister = {
    total:0,
    lastTransactionAmount: 0,
    add: function(itemCost){
        this.total += (itemCost || 0);
        this.lastTransactionAmount = itemCost;
    },
    scan: function(item,quantity){
        switch (item){
        case "eggs": this.add(0.98 * quantity); break;
        case "milk": this.add(1.23 * quantity); break;
        case "magazine": this.add(4.99 * quantity); break;
        case "chocolate": this.add(0.45 * quantity); break;
        }
        return true;
    },
    voidLastTransaction : function(){
        this.total -= this.lastTransactionAmount;
        this.lastTransactionAmount = 0;
    },
    // Create a new method applyStaffDiscount here
    applyStaffDiscount(employee){
        this.total -= (this.total * (employee.discountpercent/100));
    }

};

cashRegister.scan('eggs',1);
cashRegister.scan('milk',1);
cashRegister.scan('magazine',3);
// Apply your staff discount by passing the 'me' object 
// to applyStaffDiscount
cashRegister.applyStaffDiscount(me);

// Show the total bill
console.log('Your bill is '+cashRegister.total.toFixed(2));

Answer 1

嗯,这不好,你在创建applyStaffDiscount属性的文字中有语法错误

voidLastTransaction : function(){
    this.total -= this.lastTransactionAmount;
    this.lastTransactionAmount = 0;
},
applyStaffDiscount(employee){
    this.total -= (this.total * (employee.discountpercent/100));
}

让我们假设你真正尝试创建一个函数,因为你试图传递参数并使用括号等

voidLastTransaction : function(){
    this.total -= this.lastTransactionAmount;
    this.lastTransactionAmount = 0;
},
applyStaffDiscount : function(employee){
    this.total -= (this.total * (employee.discountpercent/100));
}