ClearAttributes
 Usage
• ClearAttributes[s, attr] 从符号 s的属性列表中移走attr.
Notes
• ClearAttributes 修改 Attributes[s]. • ClearAttributes[s,   ,  , ...  ]一次移走几个属性. • ClearAttributes[  ,  , ...  , attrs]一次从几个符号移走属性. • ClearAttributes 具有属性 HoldFirst. • ClearAttributes 并不对属性 Locked发生影响.
 Further Examples
This defines a function for integer arguments.
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It doesn't do anything on lists.
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This makes it listable.
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Now it works on lists.
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This makes fun1 no longer listable; the definition still works.
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