嵌套jQuery $ .when [英] Nested jQuery $.when

问题描述

基本上，我很想写这个:

Essentially I am tring to write this:

var async1 = $.when( a1() ).then(function(){ a2() });
var async2 = $.when( a3() ).then(function(){ a4() });

$.when(async1, async2).then(function(){ 
    console.log("complete");
}); 

但是在执行a1和a3时，该函数认为自己已解决.

But at the moment when a1 and a3 have executed the function considers itself resolved.

我将相同的示例放在一个小提琴中: http://jsfiddle.net/Z7fzR/

I put together the same example in a fiddle: http://jsfiddle.net/Z7fzR/

推荐答案

您实际上从未从回调中返回由a2()和a4()创建的promise对象.这有效地返回了null，显然出于$.when目的，这算作完成:

You never actually return the promise objects created by a2() and a4() from the callback; this effectively returns null, which apparently counts as a completion for $.when purposes:

http://jsfiddle.net/Z7fzR/1/

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