### 返回值:Deferred Objectdeferred.progress(progressCallbacks)
### 概述
当Deferred对象时生成进度通知时添加被访问处理程序。
这个参数可以是一个单一的功能或功能的阵列。当递延通过调用生成的进度通知notify或notifyWith，progressCallbacks 被访问。后来deferred.progress()返回Deferred对象。Deferred对象有方法可以链接到这一个。当递延解决或拒绝，进展回调将不再被调用。欲了解更多信息，请参阅文档[Deferred object](http://www.css88.com/category/deferred-object/)。
### 参数
#### **progressCallbacks ***V1.7*
一个函数或函数数组，被呼叫递延生成进度通知。
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