本文实例讲述了JS实现跟随鼠标立体翻转图片的方法。分享给大家供大家参考。具体实现方法如下：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"><html><head><title>Wanna tell her - interactive DHTML</title><meta http-equiv="imagetoolbar" content="no"><style type="text/css">html {overflow: hidden;}body {position: absolute;margin: 0px;padding: 0px;background: #fff;width: 100%;height: 100%;}#screen {position: absolute;left: 10%;top: 10%;width: 80%;height: 80%;background: #fff;}#screen img {position: absolute;cursor: pointer;width: 0px;height: 0px;-ms-interpolation-mode:nearest-neighbor;}#bankImages {visibility: hidden;}#FPS {position: absolute;right: 5px;bottom: 5px;font-size: 10px;color: #666;font-family: verdana;}</style><script type="text/javascript">/* ==== Easing function ==== */var Library = {};Library.ease = function () {this.target = 0;this.position = 0;this.move = function (target, speed) {this.position += (target - this.position) * speed;}}var tv = {/* ==== variables ==== */O : [],fps : 0,screen : {},angle : {x : new Library.ease(),y : new Library.ease()},camera : {x : new Library.ease(),y : new Library.ease()},create3DHTML : function (i, x, y, z, sw, sh) {/* ==== create HTML image element ==== */var o = document.createElement('img');o.src = i.src;tv.screen.obj.appendChild(o);/* ==== 3D coordinates ==== */o.point3D = {x : x,y : y,z : new Library.ease(),sw : sw,sh : sh,w : i.width,h : i.height};o.point3D.z.target = z;/* ==== push object ==== */o.point2D = {};tv.O.push(o);/* ==== on mouse over event ==== */o.onmouseover = function () {if (this != tv.o) {this.point3D.z.target = tv.mouseZ;tv.camera.x.target = this.point3D.x;tv.camera.y.target = this.point3D.y;if (tv.o) tv.o.point3D.z.target = 0;tv.o = this;}return false;}/* ==== on mousedown event ==== */o.onmousedown = function () {if (this == tv.o) {if (this.point3D.z.target == tv.mouseZ) this.point3D.z.target = 0;else {tv.o = false;this.onmouseover();}}}/* ==== main 3D function ==== */o.animate = function () {/* ==== 3D coordinates ==== */var x = this.point3D.x - tv.camera.x.position;var y = this.point3D.y - tv.camera.y.position;this.point3D.z.move(this.point3D.z.target, this.point3D.z.target ? .15 : .08);/* ==== rotations ==== */var xy = tv.angle.cx * y - tv.angle.sx * this.point3D.z.position;var xz = tv.angle.sx * y + tv.angle.cx * this.point3D.z.position;var yz = tv.angle.cy * xz - tv.angle.sy * x;var yx = tv.angle.sy * xz + tv.angle.cy * x;/* ==== 2D transform ==== */var scale = tv.camera.focalLength / (tv.camera.focalLength + yz);x = yx * scale;y = xy * scale;var w = Math.round(Math.max(0, this.point3D.w * scale * this.point3D.sw));var h = Math.round(Math.max(0, this.point3D.h * scale * this.point3D.sh));/* ==== HTML rendering ==== */var o = this.style;o.left = Math.round(x + tv.screen.w - w * .5) + 'px';o.top = Math.round(y + tv.screen.h - h * .5) + 'px';o.width = w + 'px';o.height = h + 'px';o.zIndex = 10000 + Math.round(scale * 1000);}},/* ==== init script ==== */init : function (structure, FL, mouseZ, rx, ry) {this.screen.obj = document.getElementById('screen');this.screen.obj.onselectstart = function () { return false; }this.screen.obj.ondrag = function () { return false; }this.mouseZ = mouseZ;this.camera.focalLength = FL;this.angle.rx = rx;this.angle.ry = ry;/* ==== create objects ==== */var i = 0, o;while( o = structure[i++] )this.create3DHTML(o.img, o.x, o.y, o.z, o.sw, o.sh);/* ==== start script ==== */this.resize();mouse.y = this.screen.y + this.screen.h;mouse.x = this.screen.x + this.screen.w;/* ==== loop ==== */setInterval(tv.run, 16);setInterval(tv.dFPS, 1000);},/* ==== resize window ==== */resize : function () {var o = tv.screen.obj;if (o) {tv.screen.w = o.offsetWidth / 2;tv.screen.h = o.offsetHeight / 2;for(tv.screen.x=0,tv.screen.y=0;o!=null;o=o.offsetParent){tv.screen.x += o.offsetLeft;tv.screen.y += o.offsetTop;}}},/* ==== main loop ==== */run : function () {tv.fps++;/* ==== motion ease ==== */tv.angle.x.move(-(mouse.y-tv.screen.h-tv.screen.y)*tv.angle.rx,.1);tv.angle.y.move((mouse.x-tv.screen.w-tv.screen.x)*tv.angle.ry,.1);tv.camera.x.move(tv.camera.x.target, .025);tv.camera.y.move(tv.camera.y.target, .025);/* ==== angles sin and cos ==== */tv.angle.cx = Math.cos(tv.angle.x.position);tv.angle.sx = Math.sin(tv.angle.x.position);tv.angle.cy = Math.cos(tv.angle.y.position);tv.angle.sy = Math.sin(tv.angle.y.position);/* ==== loop through images ==== */var i = 0, o;while( o = tv.O[i++] ) o.animate();},/* ==== trace frames per seconds ==== */dFPS : function () {document.getElementById('FPS').innerHTML = tv.fps + ' FPS';tv.fps = 0;}}/* ==== global mouse position ==== */var mouse = {x : 0,y : 0}document.onmousemove = function(e) {if (window.event) e = window.event;mouse.x = e.clientX;mouse.y = e.clientY;return false;}/* ==== starting script ==== */onload = function() {onresize = tv.resize;/* ==== build grid ==== */var img = document.getElementById('bankImages').getElementsByTagName('img');var structure = [];for (var i = -300; i <= 300; i += 120)for (var j = -300; j <= 300; j += 120)structure.push({ img:img[0], x:i, y:j, z:0, sw:.5, sh:.5 });/* ==== let's go ==== */tv.init(structure, 350, -200, .005, .0025);}</script></head><body><div id="screen"></div><div id="bankImages"><img alt="" src="images/p2.jpg"></div><div id="FPS"></div></body></html>希望本文所述对大家的javascript程序设计有所帮助。
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