演示一：无刷新变换图片（有点歪）
演示二：鼠标触发图片变换（书面名称好像叫图像滚动）
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<%@LANGUAGE="JAVASCRIPT" CODEPAGE="936"%>
<!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><meta http-equiv="Content-Type" content="text/html; charset=gb2312" /><title>图片对象</title><script language="javascript">
<!--//书上说这样可以预缓存图片对象，实际是骗人的了。下面是我 特意整的特别大的图片 img1=new Image(300,400) img1.src="http://www.azsz.com/test/view/1.jpg" img2=new Image(300,400) img2.src="http://www.azsz.com/test/view/2.jpg" img3=new Image(300,400) img3.src="http://www.azsz.com/test/view/3.jpg" img4=new Image(300,400) img4.src="http://www.azsz.com/test/view/4.jpg"
function img(s){//根据下拉菜单传来的值，也就是被选中项调用函数
im=document.getElementById("select1").options[s].value;//得到被选中项的值 document.getElementById("img").src=eval(im+".src")//使用eval()函数引用对象的src值并赋给页面上的图片
}//下面是DW自动生成的，所以有点不好看，懒得看了，麻烦啊，下面有我自己参考书上写的function MM_preloadImages() { //v3.0 var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array(); var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++) if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}}function MM_findObj(n, d) { //v4.01 var p,i,x; if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) { d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);} if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n]; for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document); if(!x && d.getElementById) x=d.getElementById(n); return x;}function MM_nbGroup(event, grpName) { //v6.0 var i,img,nbArr,args=MM_nbGroup.arguments; if (event == "init" && args.length > 2) { if ((img = MM_findObj(args[2])) != null && !img.MM_init) { img.MM_init = true; img.MM_up = args[3]; img.MM_dn = img.src; if ((nbArr = document[grpName]) == null) nbArr = document[grpName] = new Array(); nbArr[nbArr.length] = img; for (i=4; i < args.length-1; i+=2) if ((img = MM_findObj(args[i])) != null) { if (!img.MM_up) img.MM_up = img.src; img.src = img.MM_dn = args[i+1]; nbArr[nbArr.length] = img; } } } else if (event == "over") { document.MM_nbOver = nbArr = new Array(); for (i=1; i < args.length-1; i+=3) if ((img = MM_findObj(args[i])) != null) { if (!img.MM_up) img.MM_up = img.src; img.src = (img.MM_dn && args[i+2]) ? args[i+2] : ((args[i+1])? args[i+1] : img.MM_up); nbArr[nbArr.length] = img; } } else if (event == "out" ) { for (i=0; i < document.MM_nbOver.length; i++) { img = document.MM_nbOver[i]; img.src = (img.MM_dn) ? img.MM_dn : img.MM_up; } } else if (event == "down") { nbArr = document[grpName]; if (nbArr) for (i=0; i < nbArr.length; i++) { img=nbArr[i]; img.src = img.MM_up; img.MM_dn = 0; } document[grpName] = nbArr = new Array(); for (i=2; i < args.length-1; i+=2) if ((img = MM_findObj(args[i])) != null) { if (!img.MM_up) img.MM_up = img.src; img.src = img.MM_dn = (args[i+1])? args[i+1] : img.MM_up; nbArr[nbArr.length] = img; } }}
//--></script></head><body onload="MM_preloadImages('img/3.jpg','img/2.jpg','img/4.jpg')"><p><strong>演示一：无刷新变换图片（有点歪）</strong></p><p> <select name="select1" onchange="img(this.options.selectedIndex)"> <option value="img1">1</option> <option value="img2">2</option> <option value="img3">3</option> <option value="img4">4</option> </select> <input type="image" name="img" src="img/7.jpg" /></p><p><strong>演示二：鼠标触发图片变换（书面名称好像叫图像滚动）</strong></p><p><script language="javascript"> //先建立两个数组，一组是on 状态的，一组是off状态的 //数组使用的是字符串作索引，一来方便识别，二来在代码运行中不会冲突 offimg=new Array() offimg["play"]=new Image(60,50) offimg["stop"]=new Image(60,50) offimg["pause"]=new Image(60,50) offimg["rewind"]=new Image(66,55) //赋值 offimg["play"].src="img/1.jpg" offimg["stop"].src="img/2.jpg" offimg["pause"].src="img/3.jpg" offimg["rewind"].src="img/4.jpg" //第二个数组 onimg=new Array() onimg["play"]=new Image(60,50) onimg["stop"]=new Image(60,50) onimg["pause"]=new Image(60,50) onimg["rewind"]=new Image(66,55) //赋值 onimg["play"].src="img/5.jpg" onimg["stop"].src="img/6.jpg" onimg["pause"].src="img/7.jpg" onimg["rewind"].src="img/1.jpg" function on(imgname){ if(document.images){//判断浏览器是否能够处理图片对象 document.images[imgname].src=onimg[imgname].src//将对应的图片对象的src值赋给图片 } } function off(imgname){ if(document.images){//判断浏览器是否能够处理图片对象 document.images[imgname].src=offimg[imgname].src//将对应的图片对象的src值赋给图片 } } function setmsg(msg){//改变状态栏提示 window.status=msg; return true; }</script><table width="591" border="1"> <tr> <td width="169"><table border="0" cellpadding="0" cellspacing="0"> <tr> <td><a href="http://thcjp.cnblogs.com" target="_top" onclick="MM_nbGroup('down','group1','Blogs','img/3.jpg',1)" onmouseover="MM_nbGroup('over','Blogs','img/2.jpg','img/4.jpg',1)" onmouseout="MM_nbGroup('out')"><img src="img/1.jpg" alt="田轰穿博客" name="Blogs" width="80" height="120" border="0" id="Blogs" onload="" /></a></td> </tr> </table> <p><a href="http://thcjp.cnblogs.com">上面是DW做的<br />是预载入图片</a></p></td> <td width="406"> <a href="http://thcjp.cnblogs.com"><img src="img/1.jpg" width="80" height="120" border="0" name="play" onMouseOver="on('play');return setmsg('我的教程博客 --> http://thcjp.cnblogs.com')" onmouseout="off('play');return setmsg('');" /></a> <a href="http://www.cnblogs.com/thcjp/category/65304.html"><img src="img/2.jpg" width="80" height="120" border="0" name="stop" onmouseover="on('stop');return setmsg('天轰穿的博客之js入门系列教程--> http://www.cnblogs.com/thcjp/category/65304.html')" onmouseout="off('stop');return setmsg('')"/></a> <a href="http://www.cnblogs.com/thcjp/category/59325.html"><img src="img/3.jpg" width="80" height="120" border="0" name="pause" onmouseover="on('pause');return setmsg('VS2005控件系列教程 http://www.cnblogs.com/thcjp/category/59325.html')" onmouseout="off('pause');return setmsg('')"/></a> <a href="http://thcjp.cnblogs.com"><img src="img/4.jpg" width="80" height="120" border="0" name="rewind" onmouseover="on('rewind');return setmsg('ajax系列视频教程 --> http://thcjp.cnblogs.com')" onmouseout="off('rewind');return setmsg('');" /></a></td> </tr></table></body></html>
