- Event 종류    1. Mouse Event  const submitBtn = document.querySelector(".submit-btn");const form = document.querySelector("form");const title = document.querySelector("h2");// EVENTsubmitBtn.addEventListener("click", handleEvent);submitBtn.addEventListener("dblclick", handleEvent);submitBtn.addEventListener("mousedown", handleEvent); // 요소를 클릭했을 때submitBtn.addEventListener("mouseup", handleEvent..