The button number that was pressed when the mouse event was fired.
当鼠标事件触发的时候，鼠标哪个按钮被按下。
Handle to the window that will receive the mouse message corresponding to the mouse event.
希望对鼠标事件做出响应、接收鼠标消息的窗体的句柄。
Notice that these elements have three different mouse action-related event handlers.
注意，这些元素上设置了与鼠标操作相关的三个事件处理函数。
Use the onclick event instead, and it will work for both mouse and keyboard users.
而如果使用onclick 事件，那么它将在鼠标和键盘下都工作。
When an event occurs (a click or a mouse-over, for example) the capture phase begins.
当一个事件发生时(比如单击或者鼠标划过)，捕获阶段就开始了。
For example, clicking the mouse generates an event.
例如，单击鼠标生成事件。
This signal is emitted, during a mouse press event.
这个信号在鼠标按下时产生。
ShowEventTooltips - When the mouse is hovered over an event, a tool tip is displayed.
ShowEventTooltips-当鼠标悬停在一个事件时，会显示一个工具提示。
ShowEventTooltips - When the mouse is hovered over an event, a tool tip is displayed.
ShowEventTooltips-当鼠标悬停在一个事件时，会显示一个工具提示。
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