为了让Dojo把页面的主体识别为控件并跟踪鼠标移动，您必须给主体命名。
To get Dojo to recognize the body of your page as a control and hence track mouse movements, you must give the body a name.
在各个窗口中到处移动鼠标，查看跨越显示屏跟踪的焦点指示器和淡出效果。
Move the mouse around into various Windows to see the focus designator track across your display and gradually fade out.
与当前获得焦点的窗口关联的xev程序将跟踪所有按键或鼠标移动。
A xev program attached to the currently focused window will track any key presses or mouse movements.
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