Realized Select - Inverse

In everyday life we encounter the need to select all - local anti-election, in fact, it can also be achieved using JavaScript.
Style as follows:
Here Insert Picture Description

FIG style code as follows:

<!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">
<head>
    <meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
    <title>全选-反选</title>
</head>
<body>
    <h2>请选择您的兴趣爱好</h2>
    <input type="checkbox" value="全选"  id="chkAll"/><label for="chkAll">全选</label>
    <input type="button" value="反选" id="reverse" />
    <ul id="favors">
        <li><input type="checkbox" value="" />打篮球</li>
        <li><input type="checkbox" value="" />打篮球</li>
        <li><input type="checkbox" value="" />看电影</li>
        <li><input type="checkbox" value="" />看书</li>
        <li><input type="checkbox" value="" />书法</li>
        <li><input type="checkbox" value="" />唱歌</li>
        <li><input type="checkbox" value="" />徒步旅行</li>
    </ul>
</body>
</html>

JavaScript part as follows:

function $(id){
                return document.getElementById(id);
            }
            window.onload = function(){

                $("chkAll").onclick = function(){
                    var fvs = $("favors").getElementsByTagName("input");
                    for (var i = 0; i < fvs.length; i++) {
                        fvs[i].checked = $("chkAll").checked; 
                    };
                }

                $("reverse").onclick = function(){
                    var ipts = $("favors").getElementsByTagName("input");
                    for (var i = 0; i < ipts.length; i++) {
                        ipts[i].checked = !ipts[i].checked;
                    };
                }
                var fvs = $("favors").getElementsByTagName("input");
                for (var i = 0; i < fvs.length; i++) {
                    fvs[i].onclick = function(){
                        var  isChkAll = true;
                        for (var i = 0; i < fvs.length; i++) {
                            if(!fvs[i].checked){
                                isChkAll = false;
                                break;
                            }
                        };
                        $("chkAll").checked = isChkAll;
                    }
                };
        }

Select realized by JavaScript - anti-election

Realized Select - Inverse

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