在异步回调中操作redis的一个异常

TypeError: Object [object Object] has no method 'send_command'
    at RedisClient.(anonymous function) (D:\index.js:991:25)
    at null._onTimeout (D:\index.js:17:22)
    at Timer.listOnTimeout [as ontimeout] (timers.js:110:15)

var array = ['list', '1', '2', '3', '4',
    function() {
        console.log('success');
    }
];
client.rpush.apply(this, array);

var redis = require('redis'),
    client = redis.createClient(6379, '127.0.0.1', {
        auth_pass: 'home.local.17173.com'
    });
client.on('error', function(err) {
    console.log('redis错误：' + err);
});
client.on('connect', function() {
    setTimeout(function() {
        var array = ['list', '1', '2', '3', '4',
            function() {
                console.log('success');
            }
        ];
        client.rpush.apply(this, array);
    }, 1000);
});

client.rpush.apply(client, array);

var async = require('async');
var redis = require('redis');
var keys = ['key1', 'key2', 'key3'];
var client = redis.createClient();
var multi = client.multi();
for (var key in keys) {
  multi.hmset(key, {'some': 'value'});
}
multi.exec(function(err, res) {
  if (err) throw err;
  console.dir(res);
  var myCallback = function(err, res) {
    console.log('in myCallback');
    console.dir(res);
    client.quit();
    process.exit();
  };
 async.concat(keys, client.hgetall, myCallback);
});

async.concat(keys, client.hgetall.bind(client), myCallback);