Each click-and drag operation ends with the release of the mouse button, at which point you want to remove all the handlers you installed at the beginning of the click-and-drag operation.
每个点击-拖动操作最后都是释放鼠标按钮，此时您希望移除在点击-拖放操作开始时安装的所有处理程序。
When you release the mouse button, the dragged element and the drag target switch places, and all translucent rectangles disappear until the next swap.
当松开鼠标按钮时，被拖动的元素和拖放到的目标元素就会互换位置，而且所有透明矩形也会消失，直到下一次切换。
Most compact cameras and all SLRs have a focus-lock capability, activated by pushing the shutter release button down halfway.
大部分的紧凑型相机和所有的单反相机都有一个焦点锁定功能，通过把快门按下一半儿来实现。
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