js滑鼠點擊圖片切換效果實作程式碼_javascript技巧

<div id="menuWrapper" class="menuWrapper bg1">
  <ul class="menu" id="menu">
  <li class="bg1" style="background-position:0 0;">
  <a id="bg1" href="#">迈瑞宝</a>
  <ul class="sub1" style="background-position:0 0;">
  <li><a href="#">报价：11.99-23.69万</a></li>
  <li><a href="#">车身结构：三箱</a></li>
  <li><a href="#">油耗：8.3-12.0L</a></li>
  </ul>
  </li>
  <li class="bg1" style="background-position:-266px 0px;">
  <a id="bg2" href="#">索纳塔8</a>
  <ul class="sub2" style="background-position:-266px 0;">
  <li><a href="#">报价：13.39-22.59万</a></li>
  <li><a href="#">车身结构：三箱</a></li>
  <li><a href="#">油耗：9.0-12.0L</a></li>
  </ul>
  </li>
  <li class="last bg1" style="background-position:-532px 0px;">
  <a id="bg3" href="#">K5</a>
  <ul class="sub3" style="background-position:-266px 0;">
  <li><a href="#">报价：10.88-25.58万</a></li>
  <li><a href="#">车身结构：三箱</a></li>
  <li><a href="#">油耗：8.4-13.0L</a></li>
  </ul>
  </li>
  </ul>
  </div>

ul.menu > li > a{
 float:left;
 width:265px;
 height:50px;
 margin-top:450px;
 text-align:center;
 line-height:50px;
 color:#ddd;
 background-color:#333;
 letter-spacing:1px;
 cursor:pointer;
 text-decoration:none;
 text-shadow:0px 0px 1px #fff;
}
ul.menu > li ul{
 list-style:none;
 float:left;
 margin-top:-180px;
 width:100%;
 height:110px;
 padding-top:20px;
 background-repeat:no-repeat;
 background-color:transparent;
}
ul.menu > li ul li{
 display:none;
}
 ul.menu > li ul.sub1 {
  background-image: url('../img/bg1sub.png');
 }
 ul.menu > li ul.sub2 {
  background-image: url('../img/bg2sub.png');
 }
ul.menu > li ul.sub3{
 background-image:url(../img/bg3sub.png);
}
ul.menu > li ul li a{
 color:#fff;
 text-decoration:none;
 line-height:30px;
 margin-left:20px;
 text-shadow:1px 1px 1px #444;
 font-size:11px;
}
ul.menu > li ul li a:hover{
 border-bottom:1px dotted #fff;
}
ul.menu > li ul.sub1 li{
 display:block;
}

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]];
 }