Angular Promises – Then Vs Succe

在angularjs 1.5中$http success和error方法已弃用。
Simple calls with no chaining is usually no problem, but if you try to chain off a success handler you might be in for a surprise.

The fundamental difference between 'success' and 'then' is that success will return the original promise instead of returning a new derived promise. Each then() invocation returns a fresh promise – which is key to chaining multiple promise calls.

$http.get('/firstUrl')
    .success(function(response){
        console.log(response);
        //return 返回的数据不能被下面的success或者then取到，取到的一直是response。
        //This promise is returned in vain - no one cares about the result :-(
        return $http.get('/secondUrl')
    })
    .success(function(response){
        console.log('I only have access to the data from the first call');
        console.log(response);
    })

如果想要通过success传值，可以通过deffered.resolve(data)

function getList(){
var deffered = $q.defer();
$http.get('/firstUrl')
    .success(function(response){
        if (res.result == 0) {
                deffered.resolve(res);
        } else {
                deffered.reject('err');
        }
    })
    .error(function(err){
        deffered.reject('err');
    })
return deffered.promise; //必须返回promise
}

如果用then就会简单很多

function getList(){
return $http.get('/firstUrl')  //必须加上return
    .then(function(response){
        if (res.result == 0) {
                return res;
        } else {
              return $q.reject('err');
        }
    })
    .catch(function(err){
        console.log(err);
    })
}

示例：

            var jsonp = function (apiKey, params, isCommon) {
                var promise;
                if (isCommon) {
                    promise = $http.jsonp(JOLLY_CONFIG['apiCommonUrl'], {
                        params: {
                            data: params,
                            url: JOLLY_CONFIG[apiKey],
                            callback: 'JSON_CALLBACK',
                        },
                    });
                } else {
                    promise = $http.jsonp(JOLLY_CONFIG[apiKey] +
                        '?callback=JSON_CALLBACK', {
                        params: params,
                    });
                }
                return promise.then(function (res) {
                    var data = res.data;
                    if (data.result !== 0) {
                        return $q.reject(res);
                    } else {
                        return data;
                    }

                });
                 .catch(function (res) {
                    if (res.status >= 200 && res.status < 300) {
                         showToast(res.data.message);
                     } else {
                          showToast($scope.requestError);
                      }
                });
            };

httpService.jsonp(
                        'validatePhoneNumber',
                        extendParams(validatePhoneNumberParams)).
                        then(function () {

                            // 发送手机短信
                            var sendSmsCodeParams = {
                                phone: phone,
                                countryNumber: code,
                                useType: 5, //手机注册
                                terminalType: urlParms['frm'], //pc平台
                            };
                            return httpService.jsonp('sendSmsCode',
                                sendSmsCodeParams,
                                true);
                        }).then(function (res) {

                        $state.go('code', {code: code, phone: phone});

                    }).catch(function (res) {
                        errorCallback(res);
                    });

参考：http://www.syntaxsuccess.com/viewarticle/angular-promises%E2%80%93then-vs-success