Dynamic background change navigation menu effect implemented by jQuery

Dynamic background change navigation menu effect implemented by jQuery_jquery

WBOY

Release： 2016-05-16 15:43:19

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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-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(/(-&#63;[0-9\.]+)(px|\%|em|pt)\s(-&#63;[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 &#63; 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>

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希望本文所述对大家的jquery程序设计有所帮助。