如何确定jQuery对象是否延迟？ [英] How can I determine if a jQuery object is deferred?

问题描述

如果我有一个函数，有时会返回一个延迟对象，但有时会返回一个非延迟对象。我怎么知道它是哪一个？

If I have a function that sometimes returns a deferred object but sometimes a non-deferred object. How can I tell which one it is?

推荐答案

根据你的使用情况，你也可以使用 jQuery.when [1]：

Depending on your use case, you could also use jQuery.when [1]:

如果将单个参数传递给 jQuery 。当并且它不是Deferred时，它将被视为已解决的Deferred，并且任何附加的doneCallbacks将立即执行。

If a single argument is passed to jQuery.when and it is not a Deferred, it will be treated as a resolved Deferred and any doneCallbacks attached will be executed immediately.

使用 jQuery.when ，您可以将您的神秘对象始终视为延期：

With jQuery.when you can treat your mysterious object always as deferred:

// x could be a deferred object or an immediate result
var x = getMysteriousObject();
// success will be called when x is a deferred object and has been resolved
// or when x is an immediate result
jQuery.when( x ).then( success, error );

[1] http://api.jquery.com/jQuery.when/

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