Gets the keyboard key referenced by the event, if the key will be processed by an Input Method Editor (IME).
取得值,这个值指出事件参考的按键是否为已按下的状态。
Because of key combinations-either in default keyboards or through input method editors-multiple key events might raise just one text input event.
由于存在键组合(使用默认键盘或输入法编辑器),因此多个键事件可能只会引发一个文本输入事件。
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