ServiceWorkerState

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ServiceWorkerState is associated with its ServiceWorker 的状态。

installing: The service worker in this state is considered an installing worker. During this state, ExtendableEvent.waitUntil() can be called inside the 安装 event handler to extend the life of the installing worker until the passed promise resolves successfully. This is primarily used to ensure that the service worker is not active until all of the core caches are populated.
installed
activating: The service worker in this state is considered an active worker. During this state, ExtendableEvent.waitUntil() can be called inside the onactivate event handler to extend the life of the active worker until the passed promise resolves successfully. No functional events are dispatched until the state becomes activated.
activated
redundant

规范	状态	注释
服务工作者 The definition of 'ServiceWorkerState' in that specification.	工作草案	初始定义。