我有一个函数,它返回一个 Promise,在里面我调用另一个函数,这个 Promise 的状态基于内部 Promise 的状态。
有没有办法简写这个过程。看下面的例子。
function foo(bar) {
var deferred = Q.defer();
switch (bar) {
case 'baz1':
deferred.resolve();
break;
case 'baz2':
deferred.reject();
break;
case 'this_is_how_i_do_it':
funReturningPromise().then(function (value) {
deferred.resolve(value);
}, function (err) {
deferred.reject(err);
});
break;
case 'can_we_do_it_like_this':
// can we do something like this, which will resolve or reject the deferred,
// based on the status promise returned by funReturningPromise().
// 'chain' is just a name
funReturningPromise().chain(deferred);
break;
}
return deferred;
}
谢谢,