js 动态增加表单

<form id="myForm">
  <div id="formFields">
    <input type="text" name="field1" placeholder="Field 1">
  </div>
  <button type="button" onclick="addField()">Add Field</button>
  <button type="submit">Submit</button>
</form>

function addField() {
  const formFields = document.getElementById('formFields');
  const newField = document.createElement('input');
  newField.type = 'text';
  newField.name = 'field' + (formFields.children.length + 1);
  newField.placeholder = 'Field ' + (formFields.children.length + 1);
  formFields.appendChild(newField);
}