图形左右晃动脚本

- 中国WEB开发者网络 (http://www.webasp.net)
-- 网页特效 (http://www.webasp.net/javascript/)
--- 图形左右晃动脚本 (http://www.webasp.net/javascript/1/241.htm)
-- 发布日期： 2004-06-23
<!-- 网页特效代码由[中国WEB开发者网络:http://www.ChinaWebDev.com]提供！ -->
<!-- 要实现此效果需要 2 个步骤： -->

<!-- 第 1 步： -->
<!-- 把下面的代码加到<HEAD></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 2 步： -->
<!-- 把下面的代码加到<BODY></BODY>区域中： -->

<img src="http://www.webasp.net/images/logo.gif" name="picture" style='position: absolute; top: 10px; left: 30px;' BORDER=0>
<SCRIPT LANGUAGE="JavaScript">
<!--
setTimeout("moveLR('picture',300,1)",10);
//-->
</SCRIPT>
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