当拖放时，只有这个透明的矩形会移动—初始的元素保持不动直到鼠标按钮被松开为止。
While you're dragging, only the translucent rectangle moves-the original element stays put until the mouse button is released.
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。
When you release the mouse button, the dragged element and the drag target switch places, and all translucent rectangles disappear until the next swap.
这些组件不支持对导航器执行拖拽并将鼠标悬停在上方的跨页面拖放操作。
Drag-and-drop action across pages by dragging and hovering over the navigator is not supported by these components.
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