# 2.1 概览

- [2.1.1 啥是Socket.io](https://socket.gitbook.io/docs/2-wen-dang-docs/2.1-gai-lan/what_socket.io_is.md)
- [2.1.2 Socket.io不是什么](https://socket.gitbook.io/docs/2-wen-dang-docs/2.1-gai-lan/what_socket.io_is_not.md)
- [2.1.3 安装](https://socket.gitbook.io/docs/2-wen-dang-docs/2.1-gai-lan/installing.md)
- [2.1.4 在Node HTTP 服务中使用](https://socket.gitbook.io/docs/2-wen-dang-docs/2.1-gai-lan/using_with_node_http_server.md)
- [2.1.5 在express中使用Socket.io](https://socket.gitbook.io/docs/2-wen-dang-docs/2.1-gai-lan/using_with_express.md)
- [2.1.6 发送和接收事件](https://socket.gitbook.io/docs/2-wen-dang-docs/2.1-gai-lan/sending_and_receiving_events.md)
- [2.1.7 限制自己使用命名空间](https://socket.gitbook.io/docs/2-wen-dang-docs/2.1-gai-lan/restricting_yourself_to_a_namespace.md)
- [2.1.8 发送易失性的消息](https://socket.gitbook.io/docs/2-wen-dang-docs/2.1-gai-lan/sending_volatile_message.md)
- [2.1.9 发送和获取数据(确认)](https://socket.gitbook.io/docs/2-wen-dang-docs/2.1-gai-lan/sending_and_getting_data_acknowledgements.md)
- [2.1.10 广播消息](https://socket.gitbook.io/docs/2-wen-dang-docs/2.1-gai-lan/broadcasting_messages.md)
- [2.1.111 作为跨浏览器使用websocket](https://socket.gitbook.io/docs/2-wen-dang-docs/2.1-gai-lan/using_it_just_as_a_cross_browser_websocket.md)


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