图片的洋葱皮动画效果的实现代码
来源： 录入时间：07-06-09 21:39:15
有什么问题请到<a href='/bbs/forums.php?fid=21'>论坛</a>中发表<br> <div align="center"> <SCRIPT language=JavaScript> //----------------------- Start Customizable Variables -----------------------// //=== Positioning ===// var left = 100; // Starting left position var top = 20; // Starting left position //=== Curve and Distance ===// var topInc = 5; // Incriment of top position var leftInc = 5; // Incriment of left position /* Make both the horizontal curve and the vertical curve the same to.. .. get an increasing gap with no curve. */ var hor_curve = 20; // Horizontal curve - 0 for no curve var ver_curve = -20; // Vertical curve - 0 for no curve //=== Timing and Other ===// var noTimes = 50; // Number of times the picture is shown var waitTime = 1; // Time delay var layer = 2; // Layer level var picture = '/images/logo.gif'; // Picture to display (Smaller images work better) var start_retracted= true; // Start the image retracted (true / false) var retract= true; // Retract from behind after expanding (true / false) //=== Fade options (Only IEusers see fade) ===// var fade = true; // Gradual Fade (true / false) - Only works if retract =true var fd_destop = 0; // Destination transparency level (ie 80, for mostly solid) var fd_rate = 10; // Time in milliseconds between trasparency changes (best under 100) var fd_delta = 5; // Amount of change each time (ie 5, for 5% change in transparency) var event_init = 'onClick'; // Event at which the script is initiated var left_formula = '(left + leftInc) + ((count/100) * hor_curve)'; // Left position formula var top_formula = '(top + topInc) + ((count/100) * ver_curve)'; // Top position formula //----------------------- End Customizable Variables -----------------------// //--------------------- DO NOT EDIT BEYOND THIS POINT! ---------------------// var count = 0; var count2 = 0; var timeOutVal = waitTime * 10; var txt; var image; var imageName; var lay = new Array; function addLayer(){ left = eval(left_formula); top = eval(top_formula); txt = "<div id='Layer" + count + "' style='position:absolute; visibility:hidden; left:" + left + "; top:" + top + "; z-index:" + layer + "'>"; txt += "<a href='#' " + event_init + "='replay()'><img src='http://www.webjx.com/htmldata/2005-02-21/" + picture + "' border=0 style='filter:alpha(opacity=100)' name = 'Image" + count + "'></a>"; txt += "</div>"; document.write(txt); lay[count]=new lib_obj("Layer"+count); } function logoCurveInit(){ while (count < noTimes) { addLayer(); count++; } count = 0; lay[0].showIt(); if (!start_retracted) animate(); } function animate(){ if (start_retracted) { if (!retract){ if (count > 0){ setTimeout('animate()',timeOutVal); lay[count].hideIt(); count--; } } else{ if (count >= 0){ setTimeout('animate()',timeOutVal); lay[count].showIt(); if (count != 0) fadeImage(); count--; } } if (retract){ if(count==0) retractIt(); } } else{ if (count < noTimes){ setTimeout('animate()',timeOutVal); lay[count].showIt(); if (count != noTimes-1 && retract) fadeImage(); count++; } if (retract){ if (count == noTimes) retractIt(); } } } function replay(){ if ((count == noTimes || (count == 0 || count == -1)) &&(count2 == noTimes-1 || count2 == 0)){ start_retracted = !start_retracted; // Make the value opposite of what it is make_all_visible(); if (start_retracted){ count = noTimes-1; } else { count = 0; } animate(); } } function retractIt(){ if (start_retracted) { // If the logo is not retracted (showing all the layers) if (count2 > 0){ setTimeout('retractIt()',timeOutVal); lay[count2].hideIt(); count2--; } } else{ // If the logo is retracted (Only showing the first layer) if (count2 < noTimes-1){ setTimeout('retractIt()',timeOutVal); lay[count2].hideIt(); count2++; } } } function fadeImage(){ if (fade){ if (count >= 0 && count <= noTimes){ image = document.images['Image' + count]; nereidFade(image,fd_destop,fd_rate,fd_delta); } } } function make_all_visible(){ for (var i = 0; i< noTimes ; i++){ if (document.images['Image' + i].style.MozOpacity){ document.images['Image' + i].style.MozOpacity=100; } else if (document.images['Image' + i].filters) { document.images['Image' + i].filters.alpha.opacity = 100; } } } ////***************(DHTMLCentral.com)****************//// function check_browser(){ this.ver=navigator.appVersion this.agent=navigator.userAgent this.dom=document.getElementById?1:0 this.opera5=this.agent.indexOf("Opera 5")>-1 this.ie5=(this.ver.indexOf("MSIE 5")>-1 && this.dom && !this.opera5)?1:0; this.ie6=(this.ver.indexOf("MSIE 6")>-1 && this.dom && !this.opera5)?1:0; this.ie4=(document.all && !this.dom && !this.opera5)?1:0; this.ie=this.ie4||this.ie5||this.ie6 this.mac=this.agent.indexOf("Mac")>-1 this.ns6=(this.dom && parseInt(this.ver) >= 5) ?1:0; this.ns4=(document.layers && !this.dom)?1:0; this.bw=(this.ie6||this.ie5||this.ie4||this.ns4||this.ns6||this.opera5) return this } bw=new check_browser() function show_message(txt){alert(txt); return false} function lib_obj(obj,nest){ if(!bw.bw) return show_message('Old browser') nest=(!nest) ? "":'document.'+nest+'.' this.evnt=bw.dom? document.getElementById(obj): bw.ie4?document.all[obj]:bw.ns4?eval(nest+"document.layers." +obj):0; if(!this.evnt) return show_message('The layer does not exist ('+obj+')' +'- If your using Netscape please check the nesting of your tags!') this.css=bw.dom||bw.ie4?this.evnt.style:this.evnt; this.ref=bw.dom||bw.ie4?document:this.css.document; this.x=parseInt(this.css.left)||this.css.pixelLeft||this.evnt.offsetLeft||0; this.y=parseInt(this.css.top)||this.css.pixelTop||this.evnt.offsetTop||0 this.w=this.evnt.offsetWidth||this.css.clip.width|| this.ref.width||this.css.pixelWidth||0; this.h=this.evnt.offsetHeight||this.css.clip.height|| this.ref.height||this.css.pixelHeight||0 this.c=0 if((bw.dom || bw.ie4) && this.css.clip) { this.c=this.css.clip; this.c=this.c.slice(5,this.c.length-1); this.c=this.c.split(' '); for(var i=0;i<4;i++){this.c[i]=parseInt(this.c[i])} } this.ct=this.css.clip.top||this.c[0]||0; this.cr=this.css.clip.right||this.c[1]||this.w||0 this.cb=this.css.clip.bottom||this.c[2]||this.h||0; this.cl=this.css.clip.left||this.c[3]||0 this.obj = obj + "Object"; eval(this.obj + "=this") return this } lib_obj.prototype.showIt = function(){this.css.visibility="visible"} lib_obj.prototype.hideIt = function(){this.css.visibility="hidden"} lib_obj.prototype.writeIt = function(text,startHTML,endHTML){ if(bw.ns4){ if(!startHTML){startHTML=""; endHTML=""} this.ref.open("text/html"); this.ref.write(startHTML+text+endHTML); this.ref.close() }else this.evnt.innerHTML=text } ////***************(DHTMLCentral.com)****************//// /* Code taken from DynamicDrive.com (Start) Gradual-Highlight Image Script II- By J. Mark Birenbaum (birenbau@ugrad.cs.ualberta.ca) For full source to script, visit http://dynamicdrive.com */ nereidFadeObjects = new Object();nereidFadeTimers = new Object(); function nereidFade(object, destOp, rate, delta){ if (!document.all)return if (object != "[object]"){ setTimeout("nereidFade("+object+","+destOp+","+rate+","+delta+")",0); return;} clearTimeout(nereidFadeTimers[object.sourceIndex]); diff = destOp-object.filters.alpha.opacity; direction = 1; if (object.filters.alpha.opacity > destOp){direction = -1;} delta=Math.min(direction*diff,delta); object.filters.alpha.opacity+=direction*delta; if (object.filters.alpha.opacity != destOp){ nereidFadeObjects[object.sourceIndex]=object; nereidFadeTimers[object.sourceIndex]=setTimeout("nereidFade(nereidFadeObjects["+object.sourceIndex+"],"+destOp+","+rate+","+delta+")",rate); } } // <-- Code taken from DynamicDrive.com (End) window.onload=new logoCurveInit(); // End Hide </SCRIPT><br><br><br><br><br><br><br><br> 用鼠标单击一下图片你可以看到非常好的效果! </div>
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