{
  "node_id": "569d5e11c4fc5de7844053d9a733c5e8",
  "keywords": [],
  "children": [
    {
      "为什么要异步IO": {
        "keywords": [],
        "children": [
          {
            "用户体验": {
              "keywords": [],
              "children": []
            }
          },
          {
            "资源分配": {
              "keywords": [],
              "children": []
            }
          }
        ]
      }
    },
    {
      "异步IO实现现状": {
        "keywords": [],
        "children": [
          {
            "异步IO与非阻塞IO": {
              "keywords": [],
              "children": []
            }
          },
          {
            "理想的非阻塞异步IO": {
              "keywords": [],
              "children": []
            }
          },
          {
            "现实的异步IO": {
              "keywords": [],
              "children": []
            }
          }
        ]
      }
    },
    {
      "Node的异步IO": {
        "keywords": [],
        "children": [
          {
            "事件循环": {
              "keywords": [],
              "children": []
            }
          },
          {
            "观察者": {
              "keywords": [],
              "children": []
            }
          },
          {
            "请求对象": {
              "keywords": [],
              "children": []
            }
          },
          {
            "执行回调": {
              "keywords": [],
              "children": []
            }
          },
          {
            "小结": {
              "keywords": [],
              "children": []
            }
          }
        ]
      }
    },
    {
      "非IO的异步API": {
        "keywords": [],
        "children": [
          {
            "定时器": {
              "keywords": [],
              "children": []
            }
          },
          {
            "process.nextTick()": {
              "keywords": [],
              "children": []
            }
          },
          {
            "setImmediate()": {
              "keywords": [],
              "children": []
            }
          }
        ]
      }
    },
    {
      "事件驱动与高性能服务器": {
        "keywords": [],
        "children": []
      }
    }
  ],
  "export": []
}