jq自定义鼠标右键菜单

效果：
代码：
<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title></title>
        <script src="test/datatables/jquery-1.10.2.js"></script>
        <style>
            *{
                padding:0;
                margin:0;
            }
            .button{
                width:200px;
                height:50px;
                background:grey;
                text-align:center;
                line-height:50px;
                margin:0 auto;
                margin-top:50px;
            }
            .menu{
                padding: 1px;
                border: 1px solid #B8CBCB;
                background-color: #fff;
                -moz-box-shadow: 2px 2px 5px #666;
                -webkit-box-shadow: 2px 2px 5px #666;
                box-shadow: 2px 2px 5px #666;
                width:140px;
                position:absolute;
                display:none;
            }
            ul li{
                list-style:none;
            }
            .li_separate{
                line-height: 0;
                margin: 3px;
                border-bottom: 1px solid #B8CBCB;
                font-size: 0;
            }
            .menu_a{
                display: block;
                height: 25px;
                line-height: 24px;
                padding: 0 5px 0 25px;
                color: #000;
                font-size: 12px;
                text-decoration: none;
            }
            .menu_a:hover{
                background: #348CCC;
                color:white;
            }
        </style>
    </head>
    <body>
        <div class="button">点击</div>
        <div class="menu">
            <ul>
                <li><a href="javascript:;" class="menu_a">复制</a></li>
                <li><a href="javascript:;" class="menu_a">粘贴</a></li>
                <li class="li_separate"></li>
                <li><a href="javascript:;" class="menu_a">删除</a></li>
            </ul>
        </div>
        <script>
            //屏蔽浏览器右键菜单
            document.oncontextmenu=function(){
                return false;
            }
            $('.button').on('mousedown',function(e){
                var key=e.which;//获取鼠标键位
                if(key==3){//1：代表左键；2：代表中键；3：代表右键
                    //获取右键点击坐标
                    var x=e.clientX;
                    var y=e.clientY;
                    $('.menu').show().css({left:x,top:y});
                }
            })
            //点击任意部位隐藏
            $(document).on('click',function(){
                $('.menu').hide();
            })
        </script>
    </body>
</html>