仿土豆网首页焦点图片切换效果-JS特效-爱易网页

仿土豆网首页焦点图片切换效果

日期：2014-05-18　浏览次数：20142 次

突然看到土豆网首页图片轮换效果很漂亮, 于是就想动手学学那轮换效果的制作, 而土豆上是flash制作的, 借鉴下pageChang想法, 用js也可实现, 暂先把这种焦点轮换命名为FocusChange.

1.对焦点图片下方进行透明处理.兼容ie6 ie7 ff透明效果
2.通过鼠标移动到不同的四小图片时,通过改变图片所处父节点id=focus_change_list的left值取得效果
3.默认下每5秒执行一次函数autoFocusChange(),来实现图片自动变换
以下是HTML网页特效代码，点击运行按钮可查看效果：

以下是程序代码

<!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>byzuo.cn---焦点图片 </title>
<style type="text/css">
/* Reset style */
* { margin:0; padding:0; word-break:break-all; }
body { background:#FFF; color:#333; font:12px/1.6em Helvetica, Arial, sans-serif; }
h1, h2, h3, h4, h5, h6 { font-size:1em; }
a { color:#039; text-decoration:none; }
 a:hover { text-decoration:underline; }
ul, li { list-style:none; }
fieldset, img { border:none; }
em, strong, cite, th { font-style:normal; font-weight:normal; }
/* Focus_change style */
#focus_change { position:relative; width:450px; height:295px; overflow:hidden; margin:20px 0 1px 60px; }
 #focus_change_list { position:absolute; width:1800px; height:295px; }
  #focus_change_list li { float:left; }
  #focus_change_list li img { width:450px; height:295px; }
 .focus_change_opacity { position:absolute; width:450px; height:70px; top:225px; left:0; background:#000; filter:alpha(opacity=50); -moz-opacity:0.5; opacity: 0.5; }
 #focus_change_btn { position:absolute; width:450px; height:65px; top:225px; left:0; }
  #focus_change_btn ul { padding-left:5px; }
  #focus_change_btn li { display:inline; float:left; margin:0 15px; padding-top:12px; }
  #focus_change_btn li img { width:76px; height:50px; border:2px solid #888; }
  #focus_change_btn .current { background:url(http://www.byzuo.cn/demo/focus_change/img/icon_arrow.gif) no-repeat 37px 8px;}
  #focus_change_btn .current img { border-color:#EEE; }
</style>
<script type="text/javascript">
function $(id) { return document.getElementById(id); }
function moveElement(elementID,final_x,final_y,interval) {
  if (!document.getElementById) return false;
  if (!document.getElementById(elementID)) return false;
  var elem = document.getElementById(elementID);
  if (elem.movement) {
    clearTimeout(elem.movement);
  }
  if (!elem.style.left) {
    elem.style.left = "0px";
  }
  if (!elem.style.top) {
    elem.style.top = "0px";
  }
  var xpos = parseInt(elem.style.left);
  var ypos = parseInt(elem.style.top);
  if (xpos == final_x && ypos == final_y) {
  return true;
  }
  if (xpos < final_x) {
    var dist = Math.ceil((final_x - xpos)/10);
    xpos = xpos + dist;
  }
  if (xpos > final_x) {
    var dist = Math.ceil((xpos - final_x)/10);
    xpos = xpos - dist;
  }
  if (ypos < final_y) {
    var dist = Math.ceil((final_y - ypos)/10);
    ypos = ypos + dist;
  }
  if (ypos > final_y) {
    var dist = Math.ceil((ypos - final_y)/10);
    ypos = ypos - dist;
  }
  elem.style.left = xpos + "px";
  elem.style.top = ypos + "px";
  var repeat = "moveElement('"+elementID+"',"+final_x+","+final_y+","+interval+")";
  elem.movement = setTimeout(repeat,interval);
}
function classNormal(){
 var focusBtnList = $('focus_change_btn').getElementsByTagName('li');
 for(var i=0;</div></div>

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