本文实例讲述了JS实现仿Windows7风格的网页右键菜单效果代码。分享给大家供大家参考。具体如下：
这是一款JS仿Windows7风格的网页右键菜单，可以多级展开的右键菜单，原生JS。可参考性强，学习JavaScript的朋友不可错过。本菜单用户体验极佳，兼容性良好，无jQuery。
运行效果截图如下：
在线演示地址如下：
http://demo.jb51.net/js/2015/js-win7-style-web-right-menu-codes/
具体代码如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>自定义多级右键菜单</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <style type="text/css"> html,body{height:100%;overflow:hidden;} body,div,ul,li{margin:0;padding:0;} body{font:12px/1.5 5fae8f6f96c59ed1;} ul{list-style-type:none;} #rightMenu{position:absolute;top:-9999px;left:-9999px;} #rightMenu ul{float:left;border:1px solid #979797;background:#f1f1f1 url(images/line.png) 24px 0 repeat-y;padding:2px;box-shadow:2px 2px 2px rgba(0,0,0,.6);} #rightMenu ul li{float:left;clear:both;height:24px;cursor:pointer;line-height:24px;white-space:nowrap;padding:0 30px;} #rightMenu ul li.sub{background-repeat:no-repeat;background-position:right 9px;background-image:url(images/arrow_win7.png);} #rightMenu ul li.active{background-color:#f1f3f6;border-radius:3px;border:1px solid #aecff7;height:22px;line-height:22px;background-position:right -8px;padding:0 29px;} #rightMenu ul ul{display:none;position:absolute;} </style> <script type="text/javascript"> var getOffset = { top: function (obj) { return obj.offsetTop + (obj.offsetParent ? arguments.callee(obj.offsetParent) : 0) }, left: function (obj) { return obj.offsetLeft + (obj.offsetParent ? arguments.callee(obj.offsetParent) : 0) } }; window.onload = function () { var oMenu = document.getElementById("rightMenu"); var aUl = oMenu.getElementsByTagName("ul"); var aLi = oMenu.getElementsByTagName("li"); var showTimer = hideTimer = null; var i = 0; var maxWidth = maxHeight = 0; var aDoc = [document.documentElement.offsetWidth, document.documentElement.offsetHeight]; oMenu.style.display = "none"; for (i = 0; i < aLi.length; i++) { //为含有子菜单的li加上箭头 aLi[i].getElementsByTagName("ul")[0] && (aLi[i].className = "sub"); //鼠标移入 aLi[i].onmouseover = function () { var oThis = this; var oUl = oThis.getElementsByTagName("ul"); //鼠标移入样式 oThis.className += " active"; //显示子菜单 if (oUl[0]) { clearTimeout(hideTimer); showTimer = setTimeout(function () { for (i = 0; i < oThis.parentNode.children.length; i++) { oThis.parentNode.children[i].getElementsByTagName("ul")[0] && (oThis.parentNode.children[i].getElementsByTagName("ul")[0].style.display = "none"); } oUl[0].style.display = "block"; oUl[0].style.top = oThis.offsetTop + "px"; oUl[0].style.left = oThis.offsetWidth + "px"; setWidth(oUl[0]); //最大显示范围 maxWidth = aDoc[0] - oUl[0].offsetWidth; maxHeight = aDoc[1] - oUl[0].offsetHeight; //防止溢出 maxWidth < getOffset.left(oUl[0]) && (oUl[0].style.left = -oUl[0].clientWidth + "px"); maxHeight < getOffset.top(oUl[0]) && (oUl[0].style.top = -oUl[0].clientHeight + oThis.offsetTop + oThis.clientHeight + "px") },300); } }; //鼠标移出 aLi[i].onmouseout = function () { var oThis = this; var oUl = oThis.getElementsByTagName("ul"); //鼠标移出样式 oThis.className = oThis.className.replace(/s"); clearTimeout(showTimer); hideTimer = setTimeout(function () { for (i = 0; i < oThis.parentNode.children.length; i++) { oThis.parentNode.children[i].getElementsByTagName("ul")[0] && (oThis.parentNode.children[i].getElementsByTagName("ul")[0].style.display = "none"); } },300); }; } //自定义右键菜单 document.oncontextmenu = function (event) { var event = event || window.event; oMenu.style.display = "block"; oMenu.style.top = event.clientY + "px"; oMenu.style.left = event.clientX + "px"; setWidth(aUl[0]); //最大显示范围 maxWidth = aDoc[0] - oMenu.offsetWidth; maxHeight = aDoc[1] - oMenu.offsetHeight; //防止菜单溢出 oMenu.offsetTop > maxHeight && (oMenu.style.top = maxHeight + "px"); oMenu.offsetLeft > maxWidth && (oMenu.style.left = maxWidth + "px"); return false; }; //点击隐藏菜单 document.onclick = function () { oMenu.style.display = "none" }; //取li中最大的宽度, 并赋给同级所有li function setWidth(obj) { maxWidth = 0; for (i = 0; i < obj.children.length; i++) { var oLi = obj.children[i]; var iWidth = oLi.clientWidth - parseInt(oLi.currentStyle ? oLi.currentStyle["paddingLeft"] : getComputedStyle(oLi,null)["paddingLeft"]) * 2 if (iWidth > maxWidth) maxWidth = iWidth; } for (i = 0; i < obj.children.length; i++) obj.children[i].style.width = maxWidth + "px"; } }; </script> </head> <body> <center>自定义右键菜单，请在页面点击右键查看效果。</center> <div id="rightMenu"> <ul> <li><strong>JavaScript 学习</strong></li> <li> 第一课 <ul> <li>响应用户操作</li> <li>事件驱动</li> <li>元素属性操作</li> </ul> </li> <li> 第二课 <ul> <li>改变网页背景颜色</li> <li>函数传参</li> <li>126邮箱全选效果</li> <li>循环及遍历操作</li> </ul> </li> <li> 第三课 <ul> <li> JavaScript组成 <ul> <li>ECMAScript</li> <li>DOM</li> <li>BOM</li> <li>JavaScript兼容性来源</li> </ul> </li> <li>JavaScript出现的位置、优缺点</li> <li>变量、类型、变量作用域</li> <li> 闭包 <ul> <li>什么是闭包</li> <li>简单应用</li> <li>闭包缺点</li> </ul> </li> <li>运算符</li> <li>程序流程控制</li> <li> 定时器的使用 <ul> <li>setInterval</li> <li>setTimeout</li> </ul> </li> </ul> </li> </ul> </div> </body> </html>
希望本文所述对大家的JavaScript程序设计有所帮助。
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