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。
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？
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？
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