如果选中第一个复选框，则根据条件禁用其他复选框

<input type="checkbox" id="checkbox1" onchange="toggleCheckboxes()"/>
<label for="checkbox1">选项1</label><br>

<input type="checkbox" id="checkbox2" disabled/>
<label for="checkbox2">选项2</label><br>

<input type="checkbox" id="checkbox3" disabled/>
<label for="checkbox3">选项3</label><br>

<script>
function toggleCheckboxes() {
  var checkbox1 = document.getElementById("checkbox1");
  var checkbox2 = document.getElementById("checkbox2");
  var checkbox3 = document.getElementById("checkbox3");
  
  if (checkbox1.checked) {
    checkbox2.disabled = true;
    checkbox3.disabled = true;
  } else {
    checkbox2.disabled = false;
    checkbox3.disabled = false;
  }
}
</script>