Sometimes it happens in WPF(MVVM) that a UI controls (View/ Xaml ) have Two DataContexts,That's why we use the ElementName property when doing the Binding Expression so we select the Binded property from the wanted DataContext. Sometimes it happens in WPF(MVVM) that a UI con
阅读背景：
像WPF中的多个DataContexts一样，angularjs是否支持这种方法？
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