效果：
代码：
1 <head runat="server"> 2 <title></title> 3 <script type="text/javascript"> 4 window.onload = function () { 5 var ckall = document.getElementById('ck1'); 6 var ck = document.getElementsByName('name1'); 7 ckall.onclick = function () { 8 for (var i = 0; i < ck.length; i++) { 9 if (ckall.checked == true) { 10 ck[i].checked = true; 11 } 12 else { 13 ck[i].checked = false; 14 } 15 } 16 } 17 }; 18 </script> 19 </head> 20 <body> 21 <form id="form1" runat="server"> 22 <input type="checkbox" id="ck1" /> 23 全选 24 <div id="div1"> 25 <input type="checkbox" name="name1" /> 26 <input type="checkbox" name="name1" /> 27 <input type="checkbox" name="name1" /> 28 <input type="checkbox" name="name1" /> 29 <input type="checkbox" name="name1" /> 30 <input type="checkbox" name="name1" /> 31 </div> 32 </form> 33 </body>