If you’re counting, there are now six 21st century live-action Spider-Man movies, including the latest, “Spider-Man: Homecoming” (Marvel/Columbia). The first three starred Tobey Maguire as Peter Parker, a nerdy high school student with the secret superhero identity of Spider-Man. In 2012 and 2014, Spider-Man became “amazing” as Andrew Garfield slipped into the Spidey suit. Baby-faced Tom Holland is the newest actor to take on the swinging role. To give Marvel’s DC competition credit, at least the Batman and Superman DC franchises spread out the revolving lead actors over the course of several years (and decades).