Yuan Yuan

This is a version, that simplely inject $sce into the service making the service works while the msg are HTML Tags.

alertService

.factory('alertService', ['$rootScope', '$timeout', '$sce', function ($rootScope, $timeout, $sce) {
var exports;

// create an array of alerts available globally
$rootScope.alerts = [];

function _factory(alertOptions) {
    return $rootScope.alerts.push({
        type: alertOptions.type,
        msg: $sce.trustAsHtml(alertOptions.message),
        close: function () {
            return exports.closeAlert(this);
        }
    });
}

function _addAlert(alertOptions) {
    var index = this.factory(alertOptions) - 1, that = this;
    $timeout(function () {
        that.closeAlertByIndex(index)
    }, 5000);
}

function _closeAlert(alert) {
    return this.closeAlertByIndex($rootScope.alerts.indexOf(alert));
}

function _closeAlertByIndex(index) {
    return $rootScope.alerts.splice(index, 1);
}

exports = {
    factory: _factory,
    addAlert: _addAlert,
    closeAlert: _closeAlert,
    closeAlertByIndex: _closeAlertByIndex
};

return exports;

}]);

View
<alert ng-repeat="alert in alerts" type="{{alert.type}}" close="alert.close()"><span ng-bind-html="alert.msg"></span></alert>

awesome! It's exactly what I need to know!