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iphone - 如何将日期格式化为包含毫秒的字符串?

NSString*nameToSave=word;NSDateFormatter*dateFormatter=[[NSDateFormatteralloc]init];NSString*fromDateString=[dateFormatterstringFromDate:[NSDatedate]];[dateFormatterrelease];nameToSave=[wordstringByAppendingString:fromDateString];nameToSave=[nameToSavestringByAppendingString:@".txt"];NSLog(@"Ser