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返回值:Deferred Objectdeferred.then(doneCallbacks,failCallbacks)

概述

添加处理程序被调用时,递延对象得到解决或者拒绝。

两个参数可以是一个单独的函数或一个函数的数组。其中一个参数,也可以为空,如果没有该类型的回调是需要的。或者,使用.done()或.fail()仅设置doneCallbacks或failCallbacks。当递延解决,doneCallbacks被调用。若递延代替拒绝,failCallbacks被调用。回调按他们添加的顺序执行。一旦deferred.then返回延迟对象,延迟对象的其它方法也可以链接到了这里,包括增加.then()方法。有关详细信息,请参阅文件Deferred object 。

参数

doneCallbacksStringV1.5

一个函数或函数数组,当延迟成功时调用。

failCallbacksStringV1.5

一个函数或函数数组,当延迟失败时调用。

示例

描述:

一旦jQuery.get方法返回一个来自延迟的对象的jqXHR对象,我们可以附加一个成功回调使用.then方法。

jQuery 代码:
$.get("test.php").then(
    function(){ alert("$.get succeeded"); },
    function(){ alert("$.get failed!"); }
);
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