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生成鼠标键按下和释放事件。
Generating mouse button press and release events.
youdao
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当鼠标事件触发的时候，鼠标哪个按钮被按下。
The button number that was pressed when the mouse event was fired.
youdao
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当鼠标事件触发的时候，鼠标哪个按钮被按下。
The button number that was pressed when the mouse event was fired.
youdao