在文本框中输入某些内容后禁用按钮？

<input type="text" id="inputText" oninput="checkInput()">
<button id="submitButton" disabled>提交</button>

<script>
function checkInput() {
  var inputText = document.getElementById("inputText").value;
  var submitButton = document.getElementById("submitButton");
  
  if (inputText === "") {
    submitButton.disabled = true;
  } else {
    submitButton.disabled = false;
  }
}
</script>