这是 MongoDB 官方提供的 Node.js 的驱动包，示例代码：

var client = new Db('test', new Server("127.0.0.1", 27017, {})),
    test = function (err, collection) {
      collection.insert({a:2}, function(err, docs) {

        collection.count(function(err, count) {
          test.assertEquals(1, count);
        });

        // Locate all the entries using find
        collection.find().toArray(function(err, results) {
          test.assertEquals(1, results.length);
          test.assertTrue(results[0].a === 2);

          // Let's close the db
          client.close();
        });
      });
    };

client.open(function(err, p_client) {
  client.collection('test_insert', test);
});

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