NSMutableDictionary *d = [NSMutableDictionary dictionary];            [d setObject:@"qingjoin" forKey:@"serveraddr"];    [d setObject:@"pwdpwd" forKey:@"userpwd"];    NSLog(@"%@",d);    //新建一个对象。    id ontest = [d objectForKey:@"serveraddr"];    id sectest = [d objectForKey:@"userpwd"];    NSLog(@"%@",ontest);    NSLog(@"%@",sectest);

结果：    serveraddr = qingjoin;    userpwd = pwdpwd;    qingjoin    pwdpwd