<!doctype html> <html lang="ja"> <head> <title>TEST</title> <style> .page { display: none; } .show { display: block; } </style> </head> <body> <div class="page" id="page1"> <h1>Page1</h1> <button onclick="goPage('page2')">Page2</button> </div> <div class="page" id="page2"> <h1>Page2</h1> <button onclick="goPage('page3')">Page3</button> </div> <div class="page" id="page3"> <h1>Page3</h1> <button on