Midway through “The Myth,” Princess Ok-soo gasps to Jackie Chan’s character, “Master, I’m so confused!” Rest assured she wasn’t the only one. Chan’s latest vehicle is an Indiana Jones-style caper that flits between the present day and 2,000 years ago, taking in settings in India and China along the way. It’s unpredictable, illogical, funny in all the wrong ways, and momentarily enjoyable as well.