javascript - js窗口逃生效果求教

<code><a href="index.php">首页</a></code>

<code><div id="myconfirm">
    <p>确认离开？</p>
    <button id="yes">是</button><button id="no">否</button>
</div>
<a href="javascript:void(0)">首页</a>
<script>
$('a').click(function(){
    myconfirm(function(){
        window.location.href="index.php";
    },function(){
        return false;
    });
});
function myconfirm(fun_yes,fun_no){
    $('#yes').unbind();
    $('#no').unbind();
    $('#yes').click(function(){
        fun_yes();
    });
    $('#no').click(function(){
        fun_no();
    });
    $('#myconfirm').show();
}
</script></code>