当你调用document.getElementsByName("name")时，你会得到一个Object。使用.item(index)遍历Object的所有项

HTML:

<input type="checkbox" onclick="for(c in document.getElementsByName('rfile')) document.getElementsByName('rfile').item(c).checked = this.checked">

<input type=​"checkbox" name=​"rfile" value=​"/​cgi-bin/​">​
<input type=​"checkbox" name=​"rfile" value=​"/​includes/​">​
<input type=​"checkbox" name=​"rfile" value=​"/​misc/​">​
<input type=​"checkbox" name=​"rfile" value=​"/​modules/​">​
<input type=​"checkbox" name=​"rfile" value=​"/​profiles/​">​
<input type=​"checkbox" name=​"rfile" value=​"/​scripts/​">​
<input type=​"checkbox" name=​"rfile" value=​"/​sites/​">​
<input type=​"checkbox" name=​"rfile" value=​"/​stats/​">​
<input type=​"checkbox" name=​"rfile" value=​"/​themes/​">​

<asp:CheckBox ID="CheckBox1" runat="server" Text="Select All" onclick="checkAll(this);" />
<br />
<asp:CheckBoxList ID="CheckBoxList1" runat="server">
    <asp:ListItem Value="Item 1">Item 1</asp:ListItem>
    <asp:ListItem Value="Item 2">Item 2</asp:ListItem>
    <asp:ListItem Value="Item 3">Item 3</asp:ListItem>
    <asp:ListItem Value="Item 4">Item 4</asp:ListItem>
    <asp:ListItem Value="Item 5">Item 5</asp:ListItem>
    <asp:ListItem Value="Item 6">Item 6</asp:ListItem>
</asp:CheckBoxList>

<script type="text/javascript">
    function checkAll(obj1) {
        var checkboxCollection = document.getElementById('<%=CheckBoxList1.ClientID %>').getElementsByTagName('input');

        for (var i = 0; i < checkboxCollection.length; i++) {
            if (checkboxCollection[i].type.toString().toLowerCase() == "checkbox") {
                checkboxCollection[i].checked = obj1.checked;
            }
        }
    }
</script>

如果采用jQuery的顶部答案，请记住传递给click函数的对象是一个EventHandler，而不是原始的复选框对象。因此代码修改如下。

HTML

<input type="checkbox" name="selectThemAll"/> Toggle All<br/>

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

Javascript

$(function() {
    jQuery("[name=selectThemAll]").click(function(source) { 
        checkboxes = jQuery("[name=foo]");
        for(var i in checkboxes){
            checkboxes[i].checked = source.target.checked;
        }
    });
})

同一表单上可能有不同的复选框集。下面是一个通过类名选择/取消选择复选框的解决方案，使用普通javascript函数document.getElementsByClassName

全选按钮

<input type='checkbox' id='select_all_invoices' onclick="selectAll()"> Select All

要选择的一些复选框

<input type='checkbox' class='check_invoice' id='check_123' name='check_123' value='321' />
<input type='checkbox' class='check_invoice' id='check_456' name='check_456' value='852' />

javascript

    function selectAll() {
        var blnChecked = document.getElementById("select_all_invoices").checked;
        var check_invoices = document.getElementsByClassName("check_invoice");
        var intLength = check_invoices.length;
        for(var i = 0; i < intLength; i++) {
            var check_invoice = check_invoices[i];
            check_invoice.checked = blnChecked;
        }
    }

由于我无法评论，这里作为回答: 我会用更一般的方式写出Can Berk Güder的解决方案， 因此，您可以对其他复选框重用该函数

<script language="JavaScript">
  function toggleCheckboxes(source, cbName) {
    checkboxes = document.getElementsByName(cbName);
    for (var i = 0, n = checkboxes.length; i < n; i++) {
      checkboxes[i].checked = source.checked;
    }
  }
</script>

<input type="checkbox" onClick="toggleCheckboxes(this,\'foo\')" /> Toggle All<br/>

<input type="checkbox" name="foo" value="bar1"> Bar 1<br/>
<input type="checkbox" name="foo" value="bar2"> Bar 2<br/>
<input type="checkbox" name="foo" value="bar3"> Bar 3<br/>
<input type="checkbox" name="foo" value="bar4"> Bar 4<br/>
<input type="checkbox" name="foo" value="bar5"> Bar 5<br/>

html

<input class='all' type='checkbox'> All
<input class='item' type='checkbox' value='1'> 1
<input class='item' type='checkbox' value='2'> 2
<input class='item' type='checkbox' value='3'> 3

javascript

$(':checkbox.all').change(function(){
  $(':checkbox.item').prop('checked', this.checked);
});