该结构不是为XMLname元素中的值使用单独类，而是将这些值直接包含在与父customer元素对应的类中。
Rather than using a separate class for the values within the XML name element, this just includes the values directly within the class that corresponds to the parent customer element.
如果父组件的类需要读取子组件的属性值或调用子组件的方法，就不能使用本地变量方法。
When the parent component class requires that kind of access, we inject the child component into the parent as a ViewChild.
如果父组件的类需要读取子组件的属性值或调用子组件的方法，就不能使用本地变量方法。
We can't use the local variable technique if an instance of the parent component class must read or write child component values or must call child component methods.
如果父组件的类需要读取子组件的属性值或调用子组件的方法，就不能使用本地变量方法。
We can't use the local variable technique if an instance of the parent component class must read or write child component values or must call child component methods.
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