箭头将处于您释放鼠标按钮的位置。
The arrowhead will be placed where you release the mouse button.
释放鼠标按钮，屏幕分成两部分，每一部分都有自己的垂直滚动条。
Release the mouse button and the screen splits into two views, each with its own vertical scroll bar.
单击鼠标按钮后，调用start方法，释放鼠标按钮后，调用end方法。
The start method is called after you click the mouse button, and the end method is called after you release the button.
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