如果一个值绑定表达式引用的模型数据不再可用，或者在组件树被恢复之前发生了更改，那么组件树的一些部分将被撤销。
If model data referenced by a value binding expression is no longer available or has changed prior to the component tree being restored, it can result in portions of the tree being dropped.
定义：通过将绑定表达式用作定位器，“绑定”将实例数据结点连接到表单控制或模型项目约束。
Definition: a "binding" connects an instance data node to a form control or to a model item constraint by using a binding expression as a locater.
通过将绑定表达式用作定位器，“绑定”将实例数据结点连接到表单控制或模型项目约束。
A "binding" connects an instance data node to a form control or to a model item constraint by using a binding expression as a locater.
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