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點選指定的圖檔變換背景圖

<!DOCTYPE html>

<html>

<head>

<meta charset="UTF-8">

<title></title>

<style>

  h1{

  width: 100%;

  color: palevioletred;

  text-align: center;

  }

  ul{

  width: 100%;

  height: 140px;

  float: none;

  display: block;

  position: absolute;

  top: 200px;

  left: 100px;

  }

  li{

  list-style: none;

  float: left;

  }

  ul>li a img{

   width: 150px;

   height: 100px;

   margin: 20px;

   border-radius: 10px;

   box-shadow: 1px 1px 70px 5px white;

  }

  #image{

  display: block;

  margin-left: 20px;

  width: 920px;

  height: 550px;

  position: absolute;

  opacity: 0.9;

  }

</style>

</head>

<body>

  <h1>畫廊</h1>

  <p id="tit">圖檔名</p>

  <img id="image" src="img/3.jpg" />

  <ul id="imagegallery">

  <li>

  <a href="img/3.jpg" target="_blank" rel="external nofollow" title="圖檔1">

    <img src="img/3.jpg"/>

  </a>

  </li>

  <li>

  <a href="img/4.jpg" target="_blank" rel="external nofollow" title="圖檔2">

    <img src="img/4.jpg"/>

  </a>

  </li>

  <li>

  <a href="img/5.jpg" target="_blank" rel="external nofollow" title="圖檔3">

    <img src="img/5.jpg"/>

  </a>

  </li>

  <li>

  <a href="img/6.jpg" target="_blank" rel="external nofollow" title="圖檔4">

    <img src="img/6.jpg"/>

  </a>

  </li>

  </ul>

  <script>

  var ul = document.getElementById("imagegallery");

  var links = ul.getElementsByTagName("a");

  var img = document.getElementById("image");

  var p =document.getElementById("tit");

  for (var i = 0;i<links.length;i++) {

  links[i].οnmοusemοve=function(){

  img.src=this.href;

  p.innerHTML=this.title;

  return false;

  }

  }

  </script>

</body>

</html>