在开发平板电脑时,如何确定用户是否点击了鼠标或笔？

document.addEventListener('mousedown', function(event) {
  console.log('鼠标按下');
});

document.addEventListener('mouseup', function(event) {
  console.log('鼠标抬起');
});

document.addEventListener('touchstart', function(event) {
  console.log('触摸开始');
});

document.addEventListener('touchend', function(event) {
  console.log('触摸结束');
});