受控组件：An input form element whose value is controlled by React。需要写事件回调更新 state.
非受控组件：form data is handled by the DOM itself。使用 ref 从 DOM中获取 value 值。
非受控组件的好处：（1）有时与非 react 代码结合会更简单；（2）slightly less code if you want to be quick and dirty。什么时候使用受控组件，什么时候使用非受控组件。一般推荐使用 controlled 组件。
<input type="file" /> 总是一个非受控组件，因为它的值只能通过用户来设定。
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本文标题：uncontrolled components
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