阻止JavaScript承诺的传播 [英] Stopping JavaScript Promises from Propagating

问题描述

想象一下，我有一个像下面的承诺链.如果调用func2，我希望避免完全调用func3或func4.

Imagine I have a promise chain like the one below. If func2 is called, I would like to avoid func3 or func4 from being called altogether.

AsyncFunction()
.then(func1, func2)
.then(func3, func4)

此刻，如果我在func2中抛出错误，将调用func4.如果我在func2中返回一个值，则似乎调用了func3.

At the moment, If I throw an error in func2, func4 would be called. If I return a value in func2, func3 seems to be called.

我正在使用Angular $ q.

I am using Angular $q.

推荐答案

将嵌套用于分支控制流.在您的情况下，它看起来像这样:

Use nesting for branching control flow. In your case, it would look like this:

AsyncFunction().then(function(res) {
    return func1(res).then(func3, func4);
}, func2);

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