JavaScript 操作复选框

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>复选框</title>
<script type="text/javascript" >
        //设置复选框状态与最上面的复选框状态相同
        function SetChecked(){
                var chks = document.getElementsByName("chkBox");
                for(var i = 0; i < chks.length; i++){
                        chks[i].checked = chkAll.checked;
                }
        }
        //设置复选框为全选或全不选状态
        function SetChkStaty(state){
                var chks = document.getElementsByName("chkBox");
                for(var i = 0; i < chks.length; i++){
                        chks[i].checked = state;
                }
        }
        //反选
        function SetAntiChk(){
                var chks = document.getElementsByName("chkBox");
                for(var i = 0; i < chks.length; i++){
                        chks[i].checked = !chks[i].checked;
                }
        }
</script>
</head>

<body>
<p><input  /></p>
<hr>
<p>
<input name="chkBox" type="checkbox" />
<input name="chkBox" type="checkbox" />
<input name="chkBox" type="checkbox" />
<input name="chkBox" type="checkbox" />
<input name="chkBox" type="checkbox" />
<input name="chkBox" type="checkbox" />
<input name="chkBox" type="checkbox" />
<input name="chkBox" type="checkbox" />
</p>
<p>
        <input  />  
        <input  />
        <a href="javascript:SetAntiChk()" >反选</a>
</p>
</body>
</html>