选中2个复选框后，禁用其余部分

<input type="checkbox" id="checkbox1">
<label for="checkbox1">选项1</label>
<input type="checkbox" id="checkbox2">
<label for="checkbox2">选项2</label>
<input type="checkbox" id="checkbox3" disabled>
<label for="checkbox3">选项3</label>
<input type="checkbox" id="checkbox4" disabled>
<label for="checkbox4">选项4</label>

const checkboxes = document.querySelectorAll('input[type="checkbox"]');
let count = 0;

checkboxes.forEach(checkbox => {
  checkbox.addEventListener('change', () => {
    if (checkbox.checked) {
      count++;
      if (count >= 2) {
        checkboxes.forEach(c => {
          if (!c.checked) {
            c.disabled = true;
          }
        });
      }
    } else {
      count--;
      checkboxes.forEach(c => {
        c.disabled = false;
      });
    }
  });
});