javascript特效--图形晃动
想让自己的图形在页面上晃动吗？
第一步:把如下代码加入<head>区域中
<SCRIPT LANGUAGE="JavaScript">
<!--

step = 0;
obj = new Image();

function anim(xp,xk,smer) //smer = direction
{
obj.style.left = x;

x += step*smer;

if (x>=(xk+xp)/2) {
  if (smer == 1) step--;
    else step++;
  }
else {
  if (smer == 1) step++;
    else step--;
  }

if (x >= xk) {
    x = xk;
    smer = -1;
   }

 if (x <= xp) {
    x = xp;
    smer = 1;
   }
// if (smer > 2) smer = 3;
 setTimeout('anim('+xp+','+xk+','+smer+')', 50);
}


function moveLR(objID,movingarea_width,c)
{

 if (navigator.appName=="Netscape") window_width = window.innerWidth;
   else window_width = document.body.offsetWidth;

 obj = document.images[objID]; 
 image_width = obj.width;
 
 x1 = obj.style.left;
 x = Number(x1.substring(0,x1.length-2));  // 30px -> 30

 if (c == 0) {

    if (movingarea_width == 0) {
        right_margin = window_width - image_width;
      anim(x,right_margin,1);
      }      
       else {
      right_margin = x + movingarea_width - image_width;
      if (movingarea_width < x + image_width) window.alert("No space for moving!");
          else anim(x,right_margin,1);
    }
  }
  else {
    if (movingarea_width == 0) right_margin = window_width - image_width;
     else {
       x = Math.round((window_width-movingarea_width)/2);
       right_margin = Math.round((window_width+movingarea_width)/2)-image_width;
     }
    anim(x,right_margin,1);
  }    
}


//-->
</SCRIPT>



第二步:在<body>区域加入如下代码
<img src="image1.gif" tppabs="http://www.csdn.net/javascript/image1.gif" width=205 height=56 name="picture" style='position: absolute; top: 10px; left: 30px;' BORDER=0>
<SCRIPT LANGUAGE="JavaScript">
<!--
 setTimeout("moveLR('picture',300,1)",10);
//-->
</SCRIPT>