Clear
 Usage
• Clear[ ,  , ... ] 清除  的值和定义. • Clear[" ", " ", ... ] 清除所有的其名字匹配任何字符串模式  的符号的值和定义.
Notes
• Clear 并不清除与符号关联的属性,信息或缺省设置. • Clear["form"]允许在节A.3.13中指定的诸如*的通配符. • Clear["context`*"]清除在特殊上下文中的所有符号. • Clear 具有属性 HoldAll. • Clear 并不对有属性Protected的符号发生影响.
 Further Examples
Various rules and values are associated with h1.
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Here are the rules in action.
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Clear gets rid of values and definitions from h1.
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The Listable attribute is left alone by Clear.
To get rid of values alone use Unset; to get rid of everything use ClearAll; to get rid of everything including the symbol h1 itself use Remove.
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