【荐】JavaScript制作可伸缩的淡绿色菜单导航-优快云博客

本文介绍了一个使用JavaScript实现的可伸缩淡绿色菜单导航。通过简单的HTML结构和JavaScript代码，可以创建一个平滑展开和收缩的菜单，适用于各种网站导航场景。

代码简介：

【荐】JavaScript制作可伸缩的淡绿色菜单导航，运行一下，您就知道！

代码内容：

<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>【荐】JavaScript制作可伸缩的淡绿色菜单导航_网页代码站(www.webdm.cn)</title>
<script type="text/javascript">
	//在ID为“js_menu”的div内开始程序
function initMenu(){
      var pm_menu = new JSMenu("js_menu");
        pm_menu.init();
    }
//定义主函数
function JSMenu(id) {
    if (!document.getElementById || !document.getElementsByTagName)
        return false;
    this.menu = document.getElementById(id);
    this.submenus = this.menu.getElementsByTagName("div");
}
//引入函数，取得所有span
JSMenu.prototype.init = function() {
    var mainInstance = this;
    for (var i = 0; i < this.submenus.length; i++)
        this.submenus[i].getElementsByTagName("span")[0].onclick = function() {
            mainInstance.toggleMenu(this.parentNode);
        };
    this.expandOne();
};
//展开含"current"的菜单
JSMenu.prototype.expandOne = function() {
    for (var i = 0; i < this.submenus.length; i++) {
        var links = this.submenus[i].getElementsByTagName("a");
        for (var j = 0; j < links.length; j++){
            if (links[j].className == "current")
            this.expandMenu(this.submenus[i]);
            }
        }
};
//变换菜单状态函数
JSMenu.prototype.toggleMenu = function(submenu) {
    if (submenu.className == "collapsed")
        this.expandMenu(submenu);
    else
        this.collapseMenu(submenu);
};
//展开所有菜单函数
JSMenu.prototype.expandMenu = function(submenu) {
    var fullHeight = submenu.getElementsByTagName("span")[0].offsetHeight;
    var links = submenu.getElementsByTagName("a");
    for (var i = 0; i < links.length; i++)
        fullHeight += links[i].offsetHeight;
    var moveBy = Math.round(5 * links.length);
    
    var mainInstance = this;
    var intId = setInterval(function() {
        var curHeight = submenu.offsetHeight;
        var newHeight = curHeight + moveBy;
        if (newHeight < fullHeight)
            submenu.style.height = newHeight + "px";
        else {
            clearInterval(intId);
            submenu.style.height = "";
            submenu.className = "";
        }
    }, 30);
    this.collapseOthers(submenu);
};
//折叠菜单函数
JSMenu.prototype.collapseMenu = function(submenu) {
    var minHeight = submenu.getElementsByTagName("span")[0].offsetHeight;
    var moveBy = Math.round(5 * submenu.getElementsByTagName("a").length);
    var mainInstance = this;
    var intId = setInterval(function() {
        var curHeight = submenu.offsetHeight;
        var newHeight = curHeight - moveBy;
        if (newHeight > minHeight)
            submenu.style.height = newHeight + "px";
        else {
            clearInterval(intId);
            submenu.style.height = "";
            submenu.className = "collapsed";
        }
    }, 30);
};
//折叠其他菜单函数
JSMenu.prototype.collapseOthers = function(submenu) {
        for (var i = 0; i < this.submenus.length; i++)
            if (this.submenus[i] != submenu && this.submenus[i].className != "collapsed")
                this.collapseMenu(this.submenus[i]);
};

</script>
<style>
  body {
  	font-size:12px;
  }
  p {
  	margin:0;
  	padding:0
  }
  .jsmenu {
  	width:160px;
  	background:url(http://www.webdm.cn/images/20091230/pm_leftbg.gif) repeat-y;
  	border-bottom:#C4DE9C solid 1px;
  }
  .jsmenu div {
  	background:url(http://www.webdm.cn/images/20091230/jm_tab.gif) no-repeat;
  	overflow:hidden;
  }
  .jsmenu div.collapsed {
  	height:28px;
  }
  .jsmenu div .fath {
  	height:11px;
  	overflow:hidden;
  	display:block;
  	padding:8px 0 8px 26px;
  	color:#2754bb;
  	font-size:14px;
  	cursor:default;
  	background:url(http://www.webdm.cn/images/20091230/jm_exp.gif) no-repeat 10px 10px;
  	border-top:#C4DE9C solid 1px;
  	cursor:pointer;
  }
  .jsmenu div .single {
  	height:27px;
  	overflow:hidden;
  	display:block;
  	padding:0;
  	font-size:14px;
  	background:url(http://www.webdm.cn/images/20091230/jm_sgl.gif) no-repeat 10px 10px;
  	border-top:#C4DE9C solid 1px;
  }
  .jsmenu div .single a {
  	padding:8px 0 8px 26px;
  	display:block;
  	text-decoration:none;
  	font-size:14px;
  	color:#2754bb;
  	cursor:pointer;
  }
  .jsmenu div .single a.current {
  	background:url(http://www.webdm.cn/images/20091230/jm_tabon.gif) no-repeat left top;
  }
  .jsmenu div.collapsed .fath {
  	background:url(http://www.webdm.cn/images/20091230/jm_col.gif) no-repeat 10px 10px;
  }
  .jsmenu div .son {
  	border-top:#C4DE9C solid 1px;
  	padding:8px 0;
  }
  .jsmenu a {
  	padding:7px 0 6px 34px;
  	display:block;
  	color:#565656;
  	text-decoration:none;
  }
  .jsmenu a:hover {
  	color:#F60;
  	text-decoration:none;
  }
  .jsmenu a.current {
  	background:url(http://www.webdm.cn/images/20091230/jm_li.gif) no-repeat;
  }
</style>
</head>
<body onload = "initMenu()">
  <div class="jsmenu" id="js_menu">
    <div>
      <span class="fath">网页代码站</span>
      <p class="son">
        <a class="current" href="#">业界新闻</a>
        <a href="#">技术动态</a>
        <a href="#">八卦评论</a>
      </p>
     </div>
     <div class="collapsed">
       <span class="fath">交互设计</span>
         <p class="son">
           <a href="#">交互设计思想</a>
           <a href="#">用户行为研究</a>
           <a href="#">设计教程</a>
         </p>
     </div>
     <div class="collapsed">
       <span class="fath">视觉设计</span>
         <p class="son">
           <a href="#">配色构图</a>
           <a href="#">技术教程</a>
         </p>
     </div>
     <div class="collapsed">
       <span class="fath">JavaScript</span>
         <p class="son">
           <a href="#">JavaScript基础</a>
           <a href="#">JavaScript框架</a>
           <a href="#">JavaScript源码范例</a>
         </p>
      </div>
      <div><span class="single"><a href="#">酷站</a></span></div>
      <div><span class="single"><a href="#">专题</a></span></div>
     </div>
  </body>
</html>
<br>
<p><a href="http://www.webdm.cn">网页代码站</a> - 最专业的代码下载网站 - 致力为中国站长提供有质量的代码！</p>

代码来自：http://www.webdm.cn/webcode/ef9e7423-3141-4a78-aaf2-ba8d81b047e0.html

转载于:https://www.cnblogs.com/webdm/archive/2011/05/11/2042840.html