Stopping JavaScript Promises from Propagating

问题

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)

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.

I am using Angular $q.

回答1:

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);

来源：https://stackoverflow.com/questions/27218787/stopping-javascript-promises-from-propagating