<div id="box" style="color:red;width: 100%;height:1000px;" > <div id="left" style="float:left;width:500px;margin-left: 50px;height:500px;background: #cdeddf;">   </div>  <div id="right" style="float:right;width:600px;margin-right: 50px;height:500px;background: #cdeaae;"> </div> <ul id="menu" style="position: absolute;visibility: hidden;list-style: none;">  <li>按鈕1</li>  <li>按鈕2</li>  <li>按鈕3</li> </ul></div>

// 添加contextmenu事件 var right = document.getElementById("right"); EventUtil.addEventListener(right, "contextmenu", function(event) { event = EventUtil.getEvent(event); EventUtil.preventDefault(event); var menu = document.getElementById("menu");  // 獲取鼠標右擊時的坐標，并設置上下文菜單出現(xiàn)位置 page = EventUtil.getPagePosition(event);  menu.style.left = page.pageX + "px"; menu.style.top = page.pageY + "px"; menu.style.visibility = "visible"; });  // 添加隱藏上下文菜單事件 EventUtil.addEventListener(document, "click", function(event) { var menu = document.getElementById("menu"); menu.style.visibility = "hidden"; });