AsyncOperation 异步操作

# AsyncOperation 异步操作

Inherits from [YieldInstruction](../YieldInstruction/YieldInstruction.html)

Asynchronous operation coroutine.

异步操作协同程序。

You can **yield** until asynchronous operation continues, or
manually check whether it's done ([isDone](AsyncOperation.isDone.html)) or progress ([progress](AsyncOperation.progress.html)).

你可以 yield 直到异步操作继续，或手动检查它是完成的([isDone](AsyncOperation.isDone.html))或是进度中([progress](AsyncOperation.progress.html))。

参见: [Application.LoadLevelAsync](../Application/Application.LoadLevelAsync.html),
[Application.LoadLevelAdditiveAsync](../Application/Application.LoadLevelAdditiveAsync.html),
[AssetBundle.LoadAsync](../AssetBundle/AssetBundle.LoadAsync.html).

### Variables**变量**

* [isDone](AsyncOperation.isDone.html)
  Has the operation finished? (Read Only)
  有操作完成了吗？（只读）
* [progress](AsyncOperation.progress.html)
  What's the operation's progress (Read
  Only)
  操作的进度是多少？（只读）
* [priority](AsyncOperation.priority.html)
  Priority lets you tweak in which order async operation
  calls will be performed.
  优先权，让你调整异步操作调用将被执行的顺序。