OpenBB

The open event of the EventSource interface is fired when a connection with an event source is opened.

AABB 包围盒: AABB 包围盒是与坐标轴对齐的包围盒, 简单性好, 紧密性较差(尤其对斜对角方向放置的瘦长形对象, 采用AABB, 将留下很大的边角空隙, 导致大量没必要的包围盒相交测试)。 OBB 包围盒: Oriented Bounding Box，有向包围盒；OBB 碰撞检测方法紧密

The open property of the HTMLDetailsElement interface is a boolean value reflecting the open HTML attribute, indicating whether the 's contents (not counting the ) is to be shown to the user.

Ribbon是什么 Ribbon 是 Netflix开源的基于HTTP和TCP等协议负载均衡组件 Ribbon 可以用来做客户端负载均衡（简单轮询、随机连接），调用注册中心的服务 Ribbon的使用需要代码里手动调用目标服务，请参考官方示例：https://github.com/Netflix/ri

The openKeyCursor() method of the IDBIndex interface returns an IDBRequest object, and, in a separate thread, creates a cursor over the specified key range, as arranged by this index.

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The lowerOpen read-only property of the IDBKeyRange interface returns a boolean indicating whether the lower-bound value is included in the key range.

Ribbon负载均衡服务调用 是什么？ 简单的说，Ribbon是Netflix发布的开源项目，主要功能是提供客户端的软件负载均衡算法和服务调用。 LB负载均衡（Load Balance）是什么？ 简单的说就是将用户的请求分摊地分配到多个服务上，从而达到系统的HA（高可用）。 常见的负载均衡软件有 N

The upperOpen read-only property of the IDBKeyRange interface returns a boolean indicating whether the upper-bound value is included in the key range.

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