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首页 / 脚本样式 / JavaScript / jQuery实现的背景动态变化导航菜单效果

本文实例讲述了jQuery实现的背景动态变化导航菜单效果。分享给大家供大家参考。具体如下:
这里介绍一款使用jQuery插件制作完成的导航菜单,一大特点是,菜单的背景有动态效果,与使用的背景图片完全变换,动态效果是在鼠标悬停时出现,也就是把鼠标放在菜单上的时候,背景即开始滚动起来,看上去漂亮极了,而且兼容性也是相当不错的,推荐给网页设计者使用。
运行效果截图如下:

在线演示地址如下:
http://demo.jb51.net/js/2015/jquery-bg-cha-menu-nav-codes/
具体代码如下:
<!DOCTYPE html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>jQuery动态背景的导航菜单</title><script type="text/javascript" src="jquery-1.6.2.min.js" charset="utf-8"></script><script type="text/javascript">$(document).ready(function(){ var width = 0; $("#menu li").each(function() {width += $(this).width()+1; }); var padding = parseInt((($("#menu").width() - width) / $("#menu li a").length)/2); var pixLeft = ($("#menu").width() - width)-(padding*$("#menu li a").length*2) $("#menu li a").each(function(index) {if (index+1 != $("#menu li a").length) { $(this).css("padding", "0 "+padding+"px"); $(this).css("background-position", "-" + $(this).position().left + "px 0");} else { padding = padding + (pixLeft/2); $(this).css("padding", "0 "+padding+"px"); $(this).css("background-position", "-" + $(this).position().left + "px 0");} }); $("#menu li a").mouseover(function(){$(this).stop().animate({ backgroundPosition: "-" + $(this).position().left - 129 + "px 0"}, 2000).mouseout(function(){ $(this).stop().animate({ backgroundPosition: "-" + $(this).position().left + "px 0"}, 2000)}) });});(function($) { if(!document.defaultView || !document.defaultView.getComputedStyle){ // IE6-IE8var oldCurCSS = jQuery.curCSS;jQuery.curCSS = function(elem, name, force){ if(name === "background-position"){name = "backgroundPosition"; } if(name !== "backgroundPosition" || !elem.currentStyle || elem.currentStyle[ name ]){return oldCurCSS.apply(this, arguments); } var style = elem.style; if ( !force && style && style[ name ] ){return style[ name ]; } return oldCurCSS(elem, "backgroundPositionX", force) +" "+ oldCurCSS(elem, "backgroundPositionY", force);}; } var oldAnim = $.fn.animate; $.fn.animate = function(prop){if("background-position" in prop){ prop.backgroundPosition = prop["background-position"]; delete prop["background-position"];}if("backgroundPosition" in prop){ prop.backgroundPosition = "("+ prop.backgroundPosition;}return oldAnim.apply(this, arguments); }; function toArray(strg){strg = strg.replace(/left|top/g,"0px");strg = strg.replace(/right|bottom/g,"100%");strg = strg.replace(/([0-9.]+)(s|)|$)/g,"$1px$2");var res = strg.match(/(-?[0-9.]+)(px|\%|em|pt)s(-?[0-9.]+)(px|\%|em|pt)/);return [parseFloat(res[1],10),res[2],parseFloat(res[3],10),res[4]]; } $.fx.step. backgroundPosition = function(fx) {if (!fx.bgPosReady) { var start = $.curCSS(fx.elem,"backgroundPosition"); if(!start){//FF2 no inline-style fallbackstart = "0px 0px"; } start = toArray(start); fx.start = [start[0],start[2]]; //var end = toArray(fx.options.curAnim.backgroundPosition); var end = toArray(fx.options.curAnim == undefined ? fx.end : fx.options.curAnim.backgroundPosition); fx.end = [end[0],end[2]]; fx.unit = [end[1],end[3]]; fx.bgPosReady = true;}//return;var nowPosX = [];nowPosX[0] = ((fx.end[0] - fx.start[0]) * fx.pos) + fx.start[0] + fx.unit[0];nowPosX[1] = ((fx.end[1] - fx.start[1]) * fx.pos) + fx.start[1] + fx.unit[1];fx.elem.style.backgroundPosition = nowPosX[0]+" "+nowPosX[1]; };})(jQuery);</script><style type="text/css">html { height:100%;min-height:100%;}body { position:relative; margin:0; padding:0; font-size:1em; font:62.8% Arial, Tahoma, Helvetica, sans-serif; min-width:1130px;min-height:100%; height:100%;background: #1e1e1d; color:#FFFFFF;}h1, h2, h3, h4, h5, h6, form, fieldset, dl, ul {margin:0; padding: 0;}strong, b {font-weight:bold;}em, i {font-style:italic;}small {display:block;}fieldset {border:0;}img {border:none;}a { color: #FFCC00; text-decoration: none;}a:hover { text-decoration: underline;}a:focus{ outline-style: none;}.go_back { position: absolute; top: 15px; left: 240px; color: #ff0072; font-size: 1.6em;}#content { position: relative; top: 100px; width:800px;position:relative; margin: 0 auto;}#menu { float: left; width: 800px; list-style: none; line-height: 33px; background: url("images/menu_bg1.gif") no-repeat top left; border-top: 1px solid #000; border-bottom: 1px solid #000; margin: 0; padding:0;}#menu li { float: left; border-left: 1px solid #000;}#menu li a { float: left; font-size: 1.2em; color: #fff; border-left: 1px solid #ccc; text-decoration: none; background: url("images/menu_bg1.gif") no-repeat top left;}#menu li a:hover { background: url("images/menu_bg_active.gif") no-repeat top left;}#menu li:first-child { border: none; }#menu li:first-child a { border: none; }</style></head><body><div id="content"><br /> <ul id="menu"><li><a href="#" title="脚本下载">脚本下载</a></li><li><a href="#" title="网页特效">网页特效</a></li><li><a href="#" title="教程文章">教程文章</a></li><li><a href="#" title="编程类库">编程类库</a></li><li><a href="#" title="最新更新">最新更新</a></li> </ul><br /></div></body></html>
希望本文所述对大家的jquery程序设计有所帮助。