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返回值:Deferred Object
deferred.state()
V1.7概述
确定一个Deferred对象的当前状态。
deferred.state（）方法返回一个字符串，代表Deferred对象的当前状态。 Deferred对象可以在三种状态之一：
pending: Deferred对象是尚未完成状态 (不是 "rejected" 或 "resolved").
resolved: Deferred对象是在解决状态，这意味着，deferred.resolve() 或者 deferred.resolveWith()被对象访问和doneCallbacks被访问（或在被调用的过程中） 。
rejected: Deferred对象是在被拒绝的状态，这意味着，deferred.reject() 或者 deferred.rejectWith() 被对象访问和failCallbacks被访问（或在被调用的过程中） 。
这种方法主要是有用的调试，以确定的，例如，递延是否已经得到解决，即使你打算拒绝它的内部代码。