DisplayFunction
 Usage
• DisplayFunction 是图形和声音函数的一个选项，它指定为了显示图形和声音而作用于其上的函数
Notes
• DisplayFunction的缺省值在图形函数中是 $DisplayFunction ，在声音函数中是$SoundDisplayFunction. • 一个典型设置是 DisplayFunction->Display[channel, #]&. • 设置 DisplayFunction->Identity 使对象返回, 单部显示.
 Further Examples
You can tell Mathematica to suppress output to the screen by setting the Plot option DisplayFunction to Identity. Evaluate the cell to create the graphic.
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Evaluate the cell to create the graphic.
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You can see both graphs together by setting the Show option DisplayFunction to $DisplayFunction. Evaluate the expression to see the graphic.
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This clears the definitions.
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