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📄 23.4.htm

📁 这是我卖的书上的源码 这书是电子邮电出版的是有关网络编程 有详细的例子
💻 HTM
字号:
🔍 
<!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>
<title>UFO!</title>
<meta http-equiv="content-type" content="text/html; charset=gb2312">
<script src="layerlib.js" type="text/javascript"></script>
<script type="text/javascript">
<!--
/* return the x-coordinate of the layer named layername */
function getX(layername)
{
  var theLayer = getElement(layername);
  if (layerobject)
    return(parseInt(theLayer.left));
   else
    return(parseInt(theLayer.style.left));
}

/* return the y-coordinate of layer named layerName */
function getY(layerName)
{
   var theLayer = getElement(layerName);

   if (layerobject)
     return(parseInt(theLayer.top));
   else
     return(parseInt(theLayer.style.top));
}

/* set animation speed and step */
var step = 3;
var framespeed = 35;

/* set animation boundaries */
var maxtop = 100;
var maxleft = 100;
var maxbottom = 400;
var maxright = 600;
var move;
/* move up until boundary */
function up()
{
  var currentY = getY('ufo');
  if (currentY> maxtop)
  {
    currentY-=step;
    setY('ufo',currentY);
    move=setTimeout("up()",(1000/framespeed));
  }
  else
    clearTimeout(move);
}

/* move down until boundary */
function down()
{
  var currentY = getY('ufo');
  if (currentY < maxbottom)
  {
    currentY+=step;
    setY('ufo',currentY);
    move=setTimeout("down()",(1000/framespeed));
  }
  else
    clearTimeout(move);
}

/* move left until boundary */
function left()
{
  var currentX = getX('ufo');
  if (currentX> maxleft)
  {
    currentX-=step;
    setX('ufo',currentX);
    move=setTimeout("left()",(1000/framespeed));
  }
  else
    clearTimeout(move);
}

/* move right until boundary */
function right()
{
  var currentX = getX('ufo');
  if (currentX < maxright)
  {
    currentX+=step;
    setX('ufo',currentX);
    move=setTimeout("right()",(1000/framespeed));
  }
  else
    clearTimeout(move);
}
//-->
</script>
</head>
<body background="star.gif">

<div id="ufo" style="position:absolute; left:200px; top:60px; width:241px;
 height:178px; z-index:1;">
 <img src="ufo.gif" width="148" height="141" alt="ufo!">
</div>

<form action="#" method="get">
   <input type="button" value="向上" onclick="up();">
   <input type="button" value="向下" onclick="down();">
   <input type="button" value="向左" onclick="left();">
   <input type="button" value="向右" onclick="right();">
   <input type="button" value="停止" onclick="clearTimeout(move);">
</form>
</body>
</html>

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