Javascript Knockout.js-ObservableArray不返回值

在击出模式下，该功能可以正常工作并绑定：

self.currentCustomer = ko.observable(new Customer("a","b","c","d","e","f","g","h"));

但是，下面的内容不适用

// Random list of customers
self.customers = ko.observableArray([
    new Customer("a","b","c","d","e","f","g","h")
]);


self.currentCustomer = ko.observable(self.customers[0]);

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我不明白这为什么不起作用。此模式无法在我的应用程序的其他部分正常工作。

要访问阵列，必须将其展开：

self.currentCustomer = ko.observable(self.customers()[0]);

---

除此之外，视图如下所示：

<p>Customer Name <input data-bind="value: currentCustomer().name" /></p>

function AppViewModel() {
   // Random list of customers
self.customers = ko.observableArray([
    new Customer("ABC Corp.")
]);


self.currentCustomer = ko.observable(self.customers()[0]); // This is the correction.

}


function Customer(_name)
{
    this.name = ko.observable(_name);
}

// Activates knockout.js
ko.applyBindings(new AppViewModel());

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谢谢你，我就知道这一定很简单。