为什么一个ko.mapping.fromJS工作而另一个不工作？ [英] Why is one ko.mapping.fromJS working and other one not?

问题描述

我有一个名为Foo的类，而Foo包含Model。我在Foo上做了一个ko.applyBinding。 Foo类有一个从服务器检索JSON的函数然后我这样做：

I have a class a class named Foo and Foo contains Model. I am doing a ko.applyBinding on Foo. The Foo class has a function which retrieves JSON from server and then I do:

 self.Model = ko.mapping.fromJS(result);

其中self是Foo的实例，结果是JSON。这是第一次。但是，当第二项我从服务器检索数据时，它就不起作用。

where self is instance of Foo and result is JSON. This works 1st time. However, when 2nd item I retrieve data from server it just doesn't work.

但是如果上面一行是：

 self.Model = ko.mapping.fromJS(result, {}, self);

可行。

任何人都可以告诉我为什么第一个不工作而第二个工作？

Can anybody tell me why is the 1st one not working and 2nd one works?

推荐答案

你的第二行应该是：

ko.mapping.fromJS(result, {}, self.Model);

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