将浏览器焦点设置为具有指定标识符的控件。
Sets the browser focus to the control with the specified identifier.
组件应该“回绕”并将焦点设置到其所包含的第一个制表位。
The component should "wrap around" and set focus to its first contained TAB stop.
当提供了鼠标悬停提示时，可以按 F2 将焦点设置到帮助框中，并在信息中滚动。
When hover help is provided, you may press F2 to give focus to the help box and scroll through the information.
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