rightShow(item) {

            this.isPersoncontextMenus = true;

            let menu = document.getElementById("msgRightMenu");

            var e = e || window.event;

            var marginWidths = 332;

            var marginHeight = 55;

            //鼠标点的坐标

            var oX = e.clientX - marginWidths;

            var oY = e.clientY - marginHeight;

            if(oX>423){

                oX = 423;

            }

            //菜单出现后的位置

            menu.style.display = "block";

            menu.style.left = oX + "px";

            menu.style.top = oY + "px";

            //阻止浏览器默认事件

            return false;//一般点击右键会出现浏览器默认的右键菜单，写了这句代码就可以阻止该默认事件