`priority` 参数对 GCM 消息有什么作用？
What does the `priority` parameter do to GCM Messages?
Google 最近在他们的 documentation of GCM 中引入了参数 priority。文档内容如下：
Sets the priority of the message. Use values between 0 - 10, where the higher value represents higher priority.
但是这个优先级到底是什么意思？不同的值 0 - 10 表示什么？
过了一会儿我找到了答案：priority 是 iOS 通知中使用的参数（如 the newly added content_available parameter）。
priority 的文档隐藏得很好，但可以在 The Binary Interface and Notification Format、"items and their identifiers" 的 table 中找到：
The notification’s priority. Provide one of the following values:
10 The push message is sent immediately.
The remote notification must trigger an alert, sound, or badge on the device. It is an error to use this priority for a push that contains only the content-available key.5 The push message is sent at a time that conserves power on the device receiving it.
Google 最近在他们的 documentation of GCM 中引入了参数 priority。文档内容如下：
Sets the priority of the message. Use values between 0 - 10, where the higher value represents higher priority.
但是这个优先级到底是什么意思？不同的值 0 - 10 表示什么？
过了一会儿我找到了答案：priority 是 iOS 通知中使用的参数（如 the newly added content_available parameter）。
priority 的文档隐藏得很好，但可以在 The Binary Interface and Notification Format、"items and their identifiers" 的 table 中找到：
The notification’s priority. Provide one of the following values:
10The push message is sent immediately. The remote notification must trigger an alert, sound, or badge on the device. It is an error to use this priority for a push that contains only the content-available key.5The push message is sent at a time that conserves power on the device receiving it.