按下了一个键盘键。
使用 Event.character 来了解已键入的字符。使用 Event.keyCode 来处理箭头键、Home/End 或其他功能键,
或者了解已按下的物理键。
根据终端用户的键盘重复设置,该事件被反复发送。
注意,按键可作为单独事件出现,一个具有有效的 Event.keyCode,另一个具有有效的 Event.character。
在具有无效键的键盘布局情况下,多个 Event.keyCode 事件可只生成一个 Event.character 事件。
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