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可选的 speed 参数规定隐藏/显示的速度,可以取以下值:”slow”、”fast” 或毫秒。

可选的 callback 参数是隐藏或显示完成后所执行的函数名称

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The optional speed parameter specifies the speed of hiding / displaying, which can take the following values: “slow”, “fast” or milliseconds.

The optional callback parameter is to hide or show the name of the function executed after completion