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.phpstudy.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-IE8 var 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 fallback start = \'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。
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