编辑代码

function isEventAttribute(attName) {
  if (attName !== 'on' && attName !== 'catch') {
    let startLetter
    if (attName.startsWith('on')) {
      startLetter = attName.substring(2, 3)
    }
    if (attName.startsWith('catch')) {
      startLetter = attName.substring(5, 6)
    }

    console.log('++StartLater', startLetter)
    if (startLetter && /[A-Z]/.test(startLetter)) {
      return true
    }
  }
  return false
}

console.log(isEventAttribute('on:tap'))