angularjs - 等待所有的 promise 得到解决

Question

所以我遇到的情况是，我有多个长度未知的 promise 链。我希望在处理完所有链条后运行一些操作。这可能吗？这是一个例子:

app.controller('MainCtrl', function($scope, $q, $timeout) {
    var one = $q.defer();
    var two = $q.defer();
    var three = $q.defer();

    var all = $q.all([one.promise, two.promise, three.promise]);
    all.then(allSuccess);

    function success(data) {
        console.log(data);
        return data + "Chained";
    }

    function allSuccess(){
        console.log("ALL PROMISES RESOLVED")
    }

    one.promise.then(success).then(success);
    two.promise.then(success);
    three.promise.then(success).then(success).then(success);

    $timeout(function () {
        one.resolve("one done");
    }, Math.random() * 1000);

    $timeout(function () {
        two.resolve("two done");
    }, Math.random() * 1000);

    $timeout(function () {
        three.resolve("three done");
    }, Math.random() * 1000);
});

在此示例中，我为 promise 一、二和三设置了一个 $q.all()，这些 promise 将在某个随机时间得到解决。然后我将 promise 添加到一和三的末尾。我希望当所有链都被解析后，all 才能解析。这是我运行此代码时的输出:

one done 
one doneChained
two done
three done
ALL PROMISES RESOLVED
three doneChained
three doneChainedChained 

有没有办法等待链解决？

Answer 1

I want the all to resolve when all the chains have been resolved.

当然，然后只需将每个链的 promise 传递到 all() 而不是初始 promise :

$q.all([one.promise, two.promise, three.promise]).then(function() {
    console.log("ALL INITIAL PROMISES RESOLVED");
});

var onechain   = one.promise.then(success).then(success),
    twochain   = two.promise.then(success),
    threechain = three.promise.then(success).then(success).then(success);

$q.all([onechain, twochain, threechain]).then(function() {
    console.log("ALL PROMISES RESOLVED");
});