您可以使用此代码。

var checkbox = document.getElementById("dlCheckAll4Delete");
checkbox.addEventListener("click", function (event) {
  let checkboxes = document.querySelectorAll(".dlMultiDelete");
  checkboxes.forEach(function (ele) {
    ele.checked = !!checkbox.checked;
  });
});

下面的方法非常容易理解，你可以在几分钟内实现现有的表单

与Jquery,

$(document).ready(function() {
  $('#check-all').click(function(){
    $("input:checkbox").attr('checked', true);
  });
  $('#uncheck-all').click(function(){
    $("input:checkbox").attr('checked', false);
  });
});

以HTML形式放在下面的按钮

<a id="check-all" href="javascript:void(0);">check all</a>
<a id="uncheck-all" href="javascript:void(0);">uncheck all</a> 

只需使用javascript，

<script type="text/javascript">
function checkAll(formname, checktoggle)
{
  var checkboxes = new Array(); 
  checkboxes = document[formname].getElementsByTagName('input');

  for (var i=0; i<checkboxes.length; i++)  {
    if (checkboxes[i].type == 'checkbox')   {
      checkboxes[i].checked = checktoggle;
    }
  }
}
</script>

以HTML形式放在下面的按钮

<button onclick="javascript:checkAll('form3', true);" href="javascript:void();">check all</button>

<button onclick="javascript:checkAll('form3', false);" href="javascript:void();">uncheck all</button>

1:添加onchange事件处理程序

<th><INPUT type="checkbox" onchange="checkAll(this)" name="chk[]" /> </th>

2:修改代码以处理已检查/未检查

 function checkAll(ele) {
     var checkboxes = document.getElementsByTagName('input');
     if (ele.checked) {
         for (var i = 0; i < checkboxes.length; i++) {
             if (checkboxes[i].type == 'checkbox') {
                 checkboxes[i].checked = true;
             }
         }
     } else {
         for (var i = 0; i < checkboxes.length; i++) {
             console.log(i)
             if (checkboxes[i].type == 'checkbox') {
                 checkboxes[i].checked = false;
             }
         }
     }
 }

使用jQuery和knockout:

由于此绑定主复选框与底层复选框保持同步，除非所有复选框都已选中，否则它将未选中。

ko.bindingHandlers.allChecked = {
  init: function (element, valueAccessor) {
    var selector = valueAccessor();

    function getChecked () {
      element.checked = $(selector).toArray().every(function (checkbox) {
        return checkbox.checked;
      });
    }

    function setChecked (value) {
      $(selector).toArray().forEach(function (checkbox) {
        if (checkbox.checked !== value) {
          checkbox.click();
        }
      });
    }

    ko.utils.registerEventHandler(element, 'click', function (event) {
      setChecked(event.target.checked);
    });

    $(window.document).on('change', selector, getChecked);

    ko.utils.domNodeDisposal.addDisposeCallback(element, () => {
      $(window.document).off('change', selector, getChecked);
    });

    getChecked();
  }
};

在html中:

<input id="check-all-values" type="checkbox" data-bind="allChecked: '.checkValue'"/>
<input id="check-1" type="checkbox" class="checkValue"/>
<input id="check-2" type="checkbox" class="checkValue"/>

演示http://jsfiddle.net/H37cb/

<script type="text/javascript" src="http://code.jquery.com/jquery-latest.min.js" /></script>

<script type="text/javascript">
$(document).ready(function(){

$('input[name="all"],input[name="title"]').bind('click', function(){
var status = $(this).is(':checked');
$('input[type="checkbox"]', $(this).parent('li')).attr('checked', status);
});

});
</script>




<div id="wrapper">
 <li style="margin-top: 20px">
  <input type="checkbox" name="all" id="all" /> <label for='all'>All</label>
  <ul>
   <li><input type="checkbox" name="title" id="title_1" /> <label for="title_1"><strong>Title 01</strong></label>
    <ul>
     <li><input type="checkbox" name="selected[]" id="box_1" value="1" /> <label for="box_1">Sub Title 01</label></li>
     <li><input type="checkbox" name="selected[]" id="box_2" value="2" /> <label for="box_2">Sub Title 02</label></li>
     <li><input type="checkbox" name="selected[]" id="box_3" value="3" /> <label for="box_3">Sub Title 03</label></li>
     <li><input type="checkbox" name="selected[]" id="box_4" value="4" /> <label for="box_4">Sub Title 04</label></li>
    </ul>
   </li>
  </ul>
  <ul>
   <li><input type="checkbox" name="title" id="title_2" /> <label for="title_2"><strong>Title 02</strong></label>
    <ul>
     <li><input type="checkbox" name="selected[]" id="box_5" value="5" /> <label for="box_5">Sub Title 05</label></li>
     <li><input type="checkbox" name="selected[]" id="box_6" value="6" /> <label for="box_6">Sub Title 06</label></li>
     <li><input type="checkbox" name="selected[]" id="box_7" value="7" /> <label for="box_7">Sub Title 07</label></li>
    </ul>
   </li>
  </ul>
 </li>
</div>

这个示例使用本地JavaScript，其中复选框变量名不同，即不全是“foo”。

<!DOCTYPE html>
<html>
<body>

<p>Toggling checkboxes</p>
<script>
function getcheckboxes() {
    var node_list = document.getElementsByTagName('input');
    var checkboxes = [];
    for (var i = 0; i < node_list.length; i++) 
    {
        var node = node_list[i];
        if (node.getAttribute('type') == 'checkbox') 
        {
            checkboxes.push(node);
        }
    } 
    return checkboxes;
}
function toggle(source) {
    checkboxes = getcheckboxes();
    for (var i = 0 n = checkboxes.length; i < n; i++) 
    {
        checkboxes[i].checked = source.checked;
    }
}
</script>    

<input type="checkbox" name="foo1" value="bar1"> Bar 1<br/>
<input type="checkbox" name="foo2" value="bar2"> Bar 2<br/>
<input type="checkbox" name="foo3" value="bar3"> Bar 3<br/>
<input type="checkbox" name="foo4" value="bar4"> Bar 4<br/>

<input type="checkbox" onClick="toggle(this)" /> Toggle All<br/>

</body>
</html>