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轻松实现JavaScript图片切换_javascript技巧

WBOY
Release: 2016-05-16 15:20:13
Original
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本文实例为大家介绍JavaScript图片切换的实现方法,分享给大家供大家参考,具体内容如下

效果图:

网页看到非常常见的一个图片切换效果:在淘宝、JD等购物时,介绍产品的图片会有多张,一般是显示一张,底下有一排小图片,鼠标放到小图片上大图片会切换.参考vivo X5M 移动4G手机 .下面记录一下实现的过程.

1. getElementById()

该方法是操作dom非常常用的一个方法,比如有一p标签,id设为pid,通过getElementById(“pid”)就可以对该元素进行操作.

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>demo</title>
  <script type="text/javascript">
    function changeText(){
      document.getElementById("pid").innerHTML
      ="It works!";
    }
  </script>
</head>
<body>
  <p id="pid" onmouseover="changeText()">Hello word!</p>
</body>
</html>
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上面代码中在body中写了一个p标签,id为pid,当鼠标放到p标签上方的时候触发onmouseover事件,执行changeText()方法,将p标签内的文档改变.

2. setAttribute()和getAttribute()

getAttribute()方法用于获取某一属性的值,setAttribute()方法用于给某一属性赋值。

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>demo</title>
  <script type="text/javascript">
    function changeUrl(){
      var baiduurl=document.getElementById("aid");
      baiduurl.getAttribute("href");
      baiduurl.setAttribute("href", 
      "http://www.taobao.com");
      baiduurl.innerHTML="淘宝";
    }
  </script>
</head>
<body>
  <a href="http://www.baidu.com" id="aid" onmouseover="changeUrl()">百度首页</a>
</body>
</html>
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上面代码中,body中有一个a标签,通过getElementById()获取a标签,baiduurl.getAttribute(“href”)的值为默认的href属性,通过baiduurl.setAttribute(“href”, “http://www.taobao.com“)设置以后,该属性值改变.完整代码:

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>on</title>
  <style type="text/css" media="screen">
  *{
     padding: 0;
  }
  body{
     font-family: 微软雅黑;
  }
  #imgbox{
        width: 320px;
        height: 490px;
        padding: 10px;
        box-shadow: 5px;
        border: 1px solid #ccc;
        border-radius: 10px;
      }
 #phoneimg{
       padding: 10px;
       border-color: 1px solid #cccccc;
    }

  </style>


</head>
<body>
   <div id="imgbox">
    <img src="images/phone1.jpg"    style="max-width:90%"  style="max-width:90%" alt="phone" id="phoneimg">   
    <p id="decimg">phone image1</p>
   </div>

   <table>
    <tbody>
      <tr>
        <td width="50px">
          <img src="images/phone2.jpg"    style="max-width:90%"  style="max-width:90%" title="phone image2" alt="" onmouseover="changeImg(this)" ></td>
        <td width="50px">
          <img src="images/phone3.jpg"    style="max-width:90%"  style="max-width:90%" title="phone image3" alt=""onmouseover="changeImg(this)" ></td>
        <td width="50px">
          <img src="images/phone4.jpg"    style="max-width:90%"  style="max-width:90%" title="phone image4" alt=""onmouseover="changeImg(this)" ></td>
        <td width="50px">
          <img src="images/phone5.jpg"    style="max-width:90%"  style="max-width:90%" title="phone image5" alt=""onmouseover="changeImg(this)" ></td>

      </tr>
    </tbody>
   </table>

   <script type="text/javascript">
     function changeImg(whichpic){       
         var imgattr=whichpic.getAttribute("src");
         var phoneimg=document.getElementById("phoneimg");
         phoneimg.setAttribute("src",imgattr);
         var dectext=whichpic.getAttribute("title");
         document.getElementById("decimg").innerHTML=dectext;
     }
   </script>
</body>
</html>
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下一步学习一下怎么实现局部放大,大家有什么好的方法吗?可以一起探讨。

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