javascript常用技巧归纳2-CFANZ编程社区

javascript常用技巧归纳2

1 倒计时

<html xmlns="http://www.w3.org/1999/xhtml" >

 <head>

     <title>标题页</title>

 <script language="JavaScript">

 var deadline= new Date("08/08/2008");

 var symbol="2008年8月8日";

 var now = new Date();

 var leave =deadline.getTime() - now.getTime();

 var day = Math.floor(leave / (1000 * 60 * 60 * 24));

 if (day > 0)

    document.write("今天离"+ symbol+"还有"+day +"天")

 else if (day == 0)

      document.write("只剩最后一天")

 else

     document.write("已经超过了所定时间");

 </script>

 </head>

 <body>

 </body>

 </html>

2 检查屏幕分辨率

<script language="JavaScript">

      function getScreen() 

      {

  if ((screen.width == 640) && (screen.height == 480)) 

      size = "640 x 480";

  else if ((screen.width == 800) && (screen.height == 600))

      size = "800 x 600";

  else if ((screen.width == 1024) && (screen.height == 768))

      size = "1024 x 768";

  else if ((screen.width == 1280) && (screen.height == 1024))

      size = "1280x1024";

  else 

             size = "默认值为640 x 480";

  alert("屏幕分辨率为 " + size );

     }

     </script>

 </head>

 <body>

 <input id="Button1" type="button" value="获取屏幕分辨率" οnclick="getScreen()" />

3 禁止复制网页上的图片

<html xmlns="http://www.w3.org/1999/xhtml" >

 <head>

     <title>标题页</title>

     <script language="javascript">

     function noCopy(control)

     {

  alert("版权所有，禁止复制！");

  return false;

     }

     function check() 

     {

  if(document.images)  //遍历页面中的图像

      for(i=0;i<document.images.length;i++)

   document.images[i].onmousedown = noCopy;

     }

     </script>

     

 </head>

 <body οnlοad="check()">

 <img src='' width=70 height=50 border=1 alt='我的图片'>

 <div> 

 <table width="300" height="50" border="0" cellspacing="2" cellpadding="0" bgcolor="#FFb609">

   <tr> 

     <td bgcolor="#ccffff">禁止复制网页中所有图片...</td>

   </tr>

 </table>

 </div>

     

 </body>

 </html>

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