嵌套这是指向错误的变量

Question

在下面的课程中

this中的new SeatReservation("Steve", this.availableMeals[0]),指的是seats内部，如何让它引用正确的availableMeals

我可以去new SeatReservation("Steve", parent.this.availableMeals[0]),

// Overall viewmodel for this screen, along with initial state
function ReservationsViewModel() {
    //var self = this;

    // Non-editable catalog data - would come from the server
    this.availableMeals = [
        { mealName: "Standard (sandwich)", price: 0 },
        { mealName: "Premium (lobster)", price: 34.95 },
        { mealName: "Ultimate (whole zebra)", price: 290 }
    ];    

    // Editable data
    this.seats = ko.observableArray([
        new SeatReservation("Steve", this.availableMeals[0]),
        new SeatReservation("Bert", this.availableMeals[0])
    ]);

    // Operations
    this.addSeat = function() {
        self.seats.push(new SeatReservation("", this.availableMeals[0]));
    }
}

Answer 1

使用您注释掉的self变量

self.availableMeals[0]

Answer 2

它也应该与this一起使用，因为你没有切换上下文。也许HTML中的绑定有问题。我创建了一个JS Fiddle，可能会帮助你。

编辑：啊，如果你的意思是addSeat中的陈述，你真的需要self变量，或者你将正确的对象应用为this：

this.addSeat = function() {
    this.seats.push(new SeatReservation("", this.availableMeals[0]));
}.apply(this);