StringDrop
 Usage
• StringDrop["string", n] 返回前n个字符被删除后的 "string".
• StringDrop["string", -n] 返回后n个字符被删除后的 "string".
• StringDrop["string",  n ] 返回第 n个字符被删除后的 "string". • StringDrop["string",  m, n ] 返回从 m到 n的字符被删除后的 "string".
Notes
• StringDrop 使用标准 序列指定(参见 A.3.5节). • 例如: StringDrop["abcdefgh", 2]  . • StringDrop["string",  m, n, s ] 以步长 s删除从 m到 n的字符.
 Further Examples
This deletes the first  characters from this string.
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This deletes the last  characters.
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This deletes the character at position  .
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This deletes characters  through  .
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This deletes characters  through  in steps of  .
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