· button：返回一个整数，用来标识该事件的产生是按下（MouseDown）或者释放（MouseUp）鼠标按钮引起的。button参数是具有相应于左按钮(位0)、右按钮(位1)以及中间按钮(位2)的一个位字段。
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public boolean mouseUp 鼠标松开处理函数
mouseUpEffect mouseUp 当鼠标在组件上松开时触发
mouseup detail 当鼠标松开时
ng-mouseup 鼠标放开
mousemove mouseup 注销鼠标事件
mouseup onmouseup 鼠标按键被松开
When that click comes, you then want to install the mousemove and mouseup handlers.
当单击发生时，就需要安装 mousemove 和 mouseup 处理程序。
If they release it over another page element with the mouseup (fn) defined, what behavior should take place?
如果用户用所定义的mouseup (fn)在另一个页面元素之上释放鼠标，那么应该发生什么行为呢？
Then it's time to ask for listening for various mouse events (mousedown, mouseup, and click) on the shadow tree's rectangle — you'll see how to react to these later.
接下来要求对影像树的矩形监听各种不同的鼠标事件(mousedown、mouseup和click)，后面将看到如何响应这些事件。
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