The element's onmousedown handler is invoked, which installs onmousemove and onmouseup handlers.
此元素的onmousedown处理程序将被调用，它安装 onmousemove和 onmouseup 处理程序。
The drag handler for a drag-and-drop operation USES all three mouse handlers: onmousedown, onmouseup, and onmousemove.
针对拖放操作的拖动处理程序使用了这三个鼠标处理程序：onmousedown、onmouseup和onmousemove。
The drag handlers are uninstalled, leaving the original onmousedown handlers behind, ready to start the next drag-and-drop sequence.
这个拖动处理程序将被卸载，只留下最初的 onmousedown 处理程序，准备好开始下一轮的拖放过程。
The drag handlers are uninstalled, leaving the original onmousedown handlers behind, ready to start the next drag-and-drop sequence.
这个拖动处理程序将被卸载，只留下最初的 onmousedown 处理程序，准备好开始下一轮的拖放过程。
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