-(BOOL) hasPrefix:(NSString *) astring;检查字符串是否以astring开头; -(BOOL) hasSuffix:(NSString *) astring;检查字符串是否以astring结尾;
如果想知道字符串内的某处是否包含其他的字符串,使用rangeOfString: -(NSRange) rangeOfString:(NSString *) astring;
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