思路：把数组转化为相应的字符串，看代码
NSMutableArray *array = [NSMutableArray arrayWithCapacity:self.reciviedContacts.count];
第一种情况
for (ContactModel *model in self.reciviedContacts) {
[array addObject:model.staffid];
}
[para setObject:[array componentsJoinedByString:@","] forKey:@"staffList"];
第二种情况
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:array options:NSJSONWritingPrettyPrinted error:nil];
[para setObject:[[NSString alloc]initWithData:jsonData encoding:NSUTF8StringEncoding] forKey:@"letterFujian"];
// para 是字典专门存放参数的
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