function hantei() { var input_message = document.getElementById("input_message").value; if (input_message == "かめ") { location.href='https://www.koeki-prj.org/roy/~c118236/reroad-test/room2/quiz.html'; } else if (input_message == "") { alert("何も入力されていません!"); return false; } else { location.href='https://www.koeki-prj.org/roy/~c118236/reroad-test/room2/hazure.html'; } }