我正在嘗試驗證輸入字段。當我嘗試在不填寫任何內容的情況下提交時，它給了我我犯的錯誤：請開始您的問題：我會永遠。因此，我正在嘗試檢查用戶在該字段中鍵入的文本是否以以下開頭：我會永遠嗎。但是，當我輸入一個（或多個）隨機字符時，它只會提交表單。我希望它檢查輸入是否以那些固定的樹詞開頭，否則不提交。{  const handleSubmitForm = e => {  const $form = e.currentTarget;  if (!$form.checkValidity()) {    e.preventDefault();    const field = $form.querySelector('.question_field');    showValidationInfo(field);    //$form.querySelector('.error').innerHTML = 'Some errors occured';  } else {    console.log('Form is valid => submit form');  }};const showValidationInfo = field => {  console.log(field);  let message;  if (field.validity.valueMissing) {    message = 'Please fill in a question starting with: Will i ever';  }  if (field.validity.typeMismatch) {    message = 'Type not right';  }  if (field.validity.rangeOverflow) {    const max = field.getAttribute('max');    message = 'Too big, max ${max}';  }  if (field.validity.rangeUnderflow) {    const min = field.getAttribute('min');    message = 'Too small, min ${min}';  }  if (field.validity.tooShort) {    const min = field.getAttribute('minlength');    message = 'Too short, minimum length is ${min}';  }  if (field.validity.tooLong) {    const max = field.getAttribute('maxlength');    message = 'Too long, maximum length is ${max}';  }  if (!field.value.toLowerCase().startsWith("will i ever")) {    message = 'Start your question with: Will i ever';  }  if (message) {    field.parentElement.querySelector('.error').textContent =    message;    field.parentElement.querySelector('.error').style.color = "red";  }};const handeInputField = e => {  const $field = e.currentTarget;  if ($field.checkValidity()) {    $field.parentElement.querySelector('.error').textContent = '';    if ($field.form.checkValidity()) {      $field.form.querySelector('.error').innerHTML = '';    }  }};const handeBlurField = e => {  const $field = e.currentTarget;  showValidationInfo($field);};