<script>
//当第一层选项选定，则该选项下的第二层全部被选定
  function allSelect(check_v, checkname) {
    var v_item = document.getElementsByName(check_v);
    var items = document.getElementsByName(checkname);
    for (var i = 0; i < items.length; ++i) {
      if (v_item[0].checked) {
        items[i].checked = true;
      }
      else {
        items[i].checked = false;
      }
    }
  }
//当第二层选项全部被选定，则第一层被选定；若第二层选项至少有一个没被选定，则第一层不被选定
  function singleSelect2parent(check_v, checkname) {
    var v_item = document.getElementsByName(check_v);
    var items = document.getElementsByName(checkname);
    var childStatus = true;
    for (var i = 0; i < items.length; ++i) {
      childStatus = (childStatus && items[i].checked);
    }
    if (childStatus) {
      v_item[0].checked = true;
    }
    else {
      v_item[0].checked = false;
    }
  }
//全选按钮，点击全选，则所有选项被选中
  function allChecked() {
    var inputItems = document.getElementsByClassName("checkbox2check");
    for (var i = 0; i < inputItems.length; i++) {
      var checkItems = document.getElementsByName("checkbox" + (i+1));
      for (var j = 0; j < checkItems.length; j++) {
        checkItems[j].checked = true;
      }
      inputItems[i].checked = true;
    }
  }
</script>
<style>
  ul li{
    list-style:none;
  }
</style>
<div>
  <input class="checkbox2check" type="checkbox" checked name="checkbox_v1" value="version1" onclick="allSelect('checkbox_v1', 'checkbox1')"><a data-toggle="collapse" data-target="#demo1">版本一<b class="caret"></b></a>
  <ul id="demo1" class="collapse in">
    <li> <input type="checkbox" checked name="checkbox1" value="layer1" onclick="singleSelect2parent('checkbox_v1', 'checkbox1')">v1.0.1</li>
    <li> <input type="checkbox" checked name="checkbox1" value="layer2" onclick="singleSelect2parent('checkbox_v1', 'checkbox1')">V1.1.1</li>
    <li> <input type="checkbox" checked name="checkbox1" value="layer3" onclick="singleSelect2parent('checkbox_v1', 'checkbox1')">V1.2.1</li>
    <li> <input type="checkbox" checked name="checkbox1" value="layer4" onclick="singleSelect2parent('checkbox_v1', 'checkbox1')">V1.3.1</li>
  </ul>
</div>
<div>
  <input class="checkbox2check" type="checkbox" checked name="checkbox_v2" value="version2" onclick="allSelect('checkbox_v2', 'checkbox2')"><a data-toggle="collapse" data-target="#demo2">版本二<b class="caret"></b></a>
  <ul id="demo2" class="collapse in">
    <li> <input type="checkbox" checked name="checkbox2" value="layer5" onclick="singleSelect2parent('checkbox_v2', 'checkbox2')">V2.0.1</li>
    <li> <input type="checkbox" checked name="checkbox2" value="layer6" onclick="singleSelect2parent('checkbox_v2', 'checkbox2')">V2.1.1</li>
    <li> <input type="checkbox" checked name="checkbox2" value="layer7" onclick="singleSelect2parent('checkbox_v2', 'checkbox2')">V2.2.1</li>
  </ul>
</div>
<div>
  <input class="checkbox2check" type="checkbox" checked name="checkbox_v3" value="version3" onclick="allSelect('checkbox_v3', 'checkbox3')"><a data-toggle="collapse" data-target="#demo3">版本三<b class="caret"></b></a>
  <ul id="demo3" class="collapse in">
    <li> <input type="checkbox" checked name="checkbox3" value="layer8" onclick="singleSelect2parent('checkbox_v3', 'checkbox3')">V3.0.1</li>
    <li> <input type="checkbox" checked name="checkbox3" value="layer9" onclick="singleSelect2parent('checkbox_v3', 'checkbox3')">V3.1.1</li>
    <li> <input type="checkbox" checked name="checkbox3" value="layer10" onclick="singleSelect2parent('checkbox_v3', 'checkbox3')">V3.2.1</li>
  </ul>
</div>
<button type="button" onclick="allChecked()">全选</button>