将下面的代码放入页脚文件foot.php或者footer.php最下面即可:

<!-- 自定义右键 -->
<style type="text/css">
a {text-decoration: none;}
div.usercm{background-repeat:no-repeat;background-position:center center;background-size:cover;background-color:#fff;font-size:13px!important;width:130px;-moz-box-shadow:1px 1px 3px rgba
(0,0,0,.3);box-shadow:0px 0px 15px #333;position:absolute;display:none;z-index:10000;opacity:0.9;border-radius: 5px;}
div.usercm ul{list-style-type:none;list-style-position:outside;margin:0px;padding:0px;display:block}
div.usercm ul li{margin:0px;padding:0px;line-height:35px;}
div.usercm ul li a{color:#666;padding:0 15px;display:block}
div.usercm ul li a:hover{color:#fff;background:rgba(9,145,113,0.88);border-radius: 5px}
div.usercm ul li a i{margin-right:10px}
a.disabled{color:#c8c8c8!important;cursor:not-allowed}
a.disabled:hover{background-color:rgba(255,11,11,0)!important}
div.usercm{background:#fff !important;}
</style>
<div class="usercm" style="left: 199px; top: 5px; display: none;">
<ul>
    <li><a href="https://www.gojogo.cn/"><i class="fa fa-home fa-fw"></i>
<span>首页</span></a></li>
    <li><a href="javascript:void(0);" onclick="getSelect();"><i class="fa fa-file fa-fw"></i> 
<span>复制</span></a></li>
    <li><a href="javascript:void(0);" onclick="baiduSearch();"><i class="fa fa-search fa-fw"> 
</i><span>百度</span></a></li>
    <li><a href="javascript:void(0);" onclick="googleSearch();"><i class="fa fa-google fa-fw"> 
</i><span>谷歌</span></a></li>
    <li><a href="javascript:history.go(1);"><i class="fa fa-arrow-right fa-fw"></i><span>前进 
</span></a></li>
    <li><a href="javascript:history.go(-1);"><i class="fa fa-arrow-left fa-fw"></i><span>后退 
</span></a></li>
    <li style="border-bottom:1px solid gray"><a href="javascript:window.location.reload();"><i class="fa fa-refresh fa-fw"></i><span>刷新</span></a></li>
    <li><a href="https://www.gojogo.cn/links"><i class="fa fa-user fa-fw"></i><span>和我当邻居</span></a></li>  
       <li><a href="https://www.gojogo.cn/about"><i class="fa fa-pencil fa-fw"></i><span>查看本站</span></a></li>
</ul>
</div>
<script type="text/javascript">
(function(a) {
    a.extend({
        mouseMoveShow: function(b) {
            var d = 0,
                c = 0,
                h = 0,
                k = 0,
                e = 0,
                f = 0;
            a(window).mousemove(function(g) {
                d = a(window).width();
                c = a(window).height();
                h = g.clientX;
                k = g.clientY;
                e = g.pageX;
                f = g.pageY;
                h + a(b).width() >= d && (e = e - a(b).width() - 5);
                k + a(b).height() >= c && (f = f - a(b).height() - 5);
                a("html").on({
                    contextmenu: function(c) {
                        3 == c.which && a(b).css({
                            left: e,
                            top: f
                        }).show()
                    },
                    click: function() {
                        a(b).hide()
                    }
                })
            })
        },
        disabledContextMenu: function() {
            window.oncontextmenu = function() {
                return !1
            }
        }
    })
})(jQuery);
function getSelect() {
    "" == (window.getSelection ? window.getSelection() : document.selection.createRange().text) 
? layer.msg("请选择需要复制的内容!") : document.execCommand("Copy")
}
function baiduSearch() {
    var a = window.getSelection ? window.getSelection() : 
document.selection.createRange().text;
    "" == a ? layer.msg("请选择需要百度的内容!") : window.open("https://www.baidu.com/s?wd=" + 
a)
}
function googleSearch() {
    var a = window.getSelection ? window.getSelection() : 
document.selection.createRange().text;
    "" == a ? layer.msg("请选择需要谷歌的内容!") : window.open("https://www.google.com/search? 
q=" + a)
}     
$(function() {
    for (var a = navigator.userAgent, b = "Android;iPhone;SymbianOS;Windows 
Phone;iPad;iPod".split(";"), d = !0, c = 0; c < b.length; c++) if (0 < a.indexOf(b[c])) {
        d = !1;
        break
    }
    d && ($.mouseMoveShow(".usercm"), $.disabledContextMenu())
});
</script>

配合弹窗提醒食用更佳, 引入 layer.js
官方CDN源:https://cdn.staticfile.org/layer/3.1.1/layer.js

代码中网站地址改成自己的博客地址

引用 fontawesome 图标
官方CDN源:https://netdna.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css