javascript - q.defer deferred.resolve 已弃用

Question

我刚刚看到此代码已被弃用，我一直在尝试遵循此指南:http://www.codelord.net/2015/09/24/$q-dot-defer-youre-doing-it-wrong/以正确的方式使用它，但我似乎无法让它工作。有人可以帮我吗？

function fetchPlayers(callback) {

            var deferred = $q.defer();

            $http.get(URL)
                .success(function (response) {
                    var data = angular.fromJson(response);
                    for (var g = 0; g < data.player.length; g++) {
                        var player = model.findPlayerByName(data.player[g].name);
                        if (player == null) {
                            var newPlayer = {
                                _id: (new Date).getTime(),
                                name: data.player[g].name,
                                position: data.player[g].position,
                            };
                            model.players.push(newPlayer);
                        }
                    }
                    deferred.resolve(model.players);
                });
            return deferred.promise;
        }

Answer 1

在我看来，它应该是:

function fetchPlayers(callback) {
    return $http.get(URL)
        .then(function (response) {
            var data = angular.fromJson(response.data);
            for (var g = 0; g < data.player.length; g++) {
                var player = model.findPlayerByName(data.player[g].name);
                if (player == null) {
                    var newPlayer = {
                        _id: (new Date).getTime(),
                        name: data.player[g].name,
                        position: data.player[g].position,
                    };
                    model.players.push(newPlayer);
                }
            }
            return model.players;
        });
}

基本上，

• 将所有 promise.success(callback) 更改为 promise.then(callback)
• 直接返回 Promise，而不是创建一个额外的延迟对象，该对象会在第一个 Promise 解析时得到解析。
• (注意)callback 的返回值被转发到链中的下一个 Promise。