js input字数限制

<input type="text" id="limitedInput" maxlength="10">

<input type="text" id="limitedInput">
<script>
  const inputElement = document.getElementById('limitedInput');
  const maxLength = 10;

  inputElement.addEventListener('input', function() {
    if (this.value.length > maxLength) {
      this.value = this.value.substring(0, maxLength);
    }
  });
</script>

inputElement.addEventListener('paste', function(event) {
  const pastedData = (event.clipboardData || window.clipboardData).getData('text');
  if (pastedData.length > maxLength) {
    event.preventDefault();
    this.value += pastedData.substring(0, maxLength - this.value.length);
  }
});

function getRealLength(str) {
  return str.replace(/[^\x00-\xff]/g, '**').length;
}