问AngularJS(1.x)和Angular (2/4)装饰器的区别

EN

$provide.decorator('$log', [
    "$delegate", function ($delegate) {
        // Save the original $log.debug()
        var debugFn = $delegate.debug;

        $delegate.debug = function () {
            var args = [].slice.call(arguments),
                now = DateTime.formattedNow();

            // Prepend timestamp
            args[0] = supplant("{0} - {1}", [now, args[0]]);

            // Call the original with the output prepended with formatted timestamp
            debugFn.apply(null, args)
        };

        return $delegate;
    }
]);