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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>Sandbox</title>
<meta http-equiv="Content-type" content="text/html; charset=utf-8" />
<style type="text/css" media="screen">
body { background-color: #aba; font: 16px Helvetica, Arial; color: #fff; }
</style>
</head>
<body>
  <form id="frm1" runat="server">
  <input type="checkbox" id="chkAll" onclick="toggleCheckBoxes(this)" /> Check/Uncheck All
  <br/>
  <div id="div">
  <input type="checkbox" name= "AS"/>
  <br/>
  <input type="checkbox" name= "AS"/>
  <br/>
  <input type="checkbox" name= "AS"/>
  <br/>
  <input type="checkbox" name= "AS"/>
  <br/>
  <input type="checkbox" name= "AS"/>  
    
  </div>
    
    </form>
</body>
</html>
 
function toggleCheckBoxes(elem) {
  var chk = document.getElementsByName('AS');
  var len = chk.length;
  var list = [];
  for (var i = 0; i < len; i++) {
      if (chk[i].checked == elem.checked) {
        list.push('Checkbox #'+i);
      }
    }        
    for (var i = 0; i < list.length; i++) {
    console.log(list[i]);
}
}
​
​
Output

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