JavaScript鼠标移动放大图片特效

<script language="JavaScript"> <!-- var smallX = 150; //缩略图宽度 var bigX = 800; //预览窗大小,可以任意设置 var bigY = 568; var srcX = -1; //原图大小,可以任意设置. 如有一个为-1将使用图片原始大小 var srcY = -1; var border = 1; //边框 var smallY,viewX,viewY,bl,isIE,vX,vY,imgo; window.onload=function (){ //初始化数据 isIE=window.event?1:0; //由于IE和FF对盒模型解释的差异,获取浏览器标记以便修正差异 if (srcX==-1 || srcY==-1){srcX=bigpic.width;srcY=bigpic.height;} // 如果有一个为-1,则使用原图大小 else{bigpic.width=srcX;bigpic.height=srcY;} smallY=srcY*smallX/srcX; //按比例计算出缩略图的高 viewX=bigX/srcX*smallX; //计算缩略图的预览窗口大小 viewY=bigY/srcY*smallY; bl=srcX/smallX; //得到缩放比例 bigbox.style.borderWidth=border; //初始化预览窗 bigbox.style.width=bigX+border*2*isIE; bigbox.style.height=bigY+border*2*isIE; view.style.borderWidth=border; //初始化小预览窗 view.style.width=viewX-!isIE*border*2; view.style.height=viewY-!isIE*border*2; loading.style.left=bigX/2+bigbox.offsetLeft*!isIE-loading.offsetWidth/2; //初始化loading loading.style.top=bigY/2+bigbox.offsetTop*!isIE-loading.offsetHeight/2; var imga=document.body.getElementsByTagName("img") //初始化所有缩略图 for (m=0;m<imga.length;m++) if (imga[m].className=="smallpic"){ imga[m].style.borderWidth=border; imga[m].width=smallX; imga[m].height=smallY; imga[m].onmouseout=function(){if (isIE) view.style.display='none'} } } function move(e,o){ if (imgo!=o){ //如果切换图片 bigpic.style.display = 'none'; bigpic.src=o.lowsrc; //载入新图片 imgo=o; //imgo作为标记,避免重复载入相同图片 }else{ var e = window.event?window.event:e; //得到IE或FF的event if (!isIE){vX=e.pageX-border-o.offsetLeft;vY=e.pageY-border-o.offsetTop} else{vX=e.offsetX;vY=e.offsetY} //分别在FF与IE下获得相对坐标 vX+=-viewX/2; vY+=-viewY/2; //得到缩略图的预览窗位置 if (vX < 0) vX = 0; //边界判断,不能超出缩略图的范围 if (vY < 0) vY = 0; if (vX > smallX - viewX) vX = smallX - viewX; if (vY > smallY - viewY) vY = smallY - viewY; bigpic.style.marginLeft = - vX * bl; //刷新预览窗口 bigpic.style.marginTop = - vY * bl; view.style.display = 'block'; //刷新缩略图中预览窗口 view.style.left = vX + o.offsetLeft + border; view.style.top = vY + o.offsetTop + border; } } //--> </script> <style type="text/css"> <!-- *{padding:0;margin:0} body{background:black} .smallpic{display:block;border:green dotted;float:left} #bigbox{border:green solid;width:800px;height:568px;overflow:hidden;font-size:0px;float:left;} #view{border:silver solid;width:0;height:0;font-size:0px;display:none;position:absolute;} #loading{position:absolute;z-index:-1;font-size:20px;font-weight:bold;color:white;} #loading img{vertical-align:middle} //--> </style> <div id="bigbox"><img id="bigpic" src="http://www.whoj.net/images//b1.jpg" border="0" onload="this.style.display = 'block'"><div id="loading"><img src="http://www.whoj.net/images/loading.gif" border="0"> Loading...</div></div><!--预览窗//--> <div id="view" onmousemove="if (!isIE) move(event,imgo)" onmouseout="if (!isIE) view.style.display='none'"></div><!--小预览窗//--> <img class="smallpic" onmousemove="move(event,this)" lowsrc="images/b1.jpg" src="images/s1.jpg"><!--缩略图,lowsrc大图,src小图//--> <img class="smallpic" onmousemove="move(event,this)" lowsrc="images/b2.jpg" src="images/s2.jpg"> <img class="smallpic" onmousemove="move(event,this)" lowsrc="images/b3.jpg" src="images/s3.jpg"> <img class="smallpic" onmousemove="move(event,this)" lowsrc="images/b4.jpg" src="images/s4.jpg"> <img class="smallpic" onmousemove="move(event,this)" lowsrc="images/b5.jpg" src="images/s5.jpg"> <div><a href="http://www.codefans.net/" style="color:#00FF00;" target="_blank">欢迎访问-源码爱好者</a></div>