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<!DOCTYPE html><html><head><meta charset="UTF-8"><title>Document</title><style type="text/css">.wrap {margin: 150px auto;position: relative;width: 400px;height: 300px;overflow: hidden;border: 2px solid #000;} .wrap img {position: absolute;}</style></head><body><p><img src="pic/1.jpg" style="left:0;top:0" /><img src="pic/2.jpg" style="left:0;top:100%" /></p><script type="text/javascript" src="js/startmove.js?1.1.10"></script><script type="text/javascript">(function(){var data = ["pic/1.jpg","pic/2.jpg","pic/3.jpg","pic/4.jpg"];var img = document.querySelectorAll('img');var now = 0;var next = 0;var imgW = css(img[0],"width");var imgH = css(img[0],"height");var isMove = false;document.addEventListener('keyup', function(e) {if(isMove){return;}switch(e.keyCode){case 37://向左toLeft();break;case 38://向上toUp();break;case 39://向右toRight();break;case 40://向下toDown();break; }});function toLeft(){next = (now + 1)%data.length;init([0,0,0,imgW],{left:-imgW},{left:0});}function toUp(){next = (now + 1)%data.length;init([0,0,imgH,0],{top:-imgH},{top:0});}function toRight(){next = (now - 1 + data.length)%data.length;init([0,0,0,-imgW],{left:imgW},{left:0});}function toDown(){next = (now - 1 + data.length)%data.length;init([0,0,-imgH,0],{top:imgH},{top:0});}// styles = [0,0,0,0];// target1 {}//init 初始位置function init(styles,target1,target2){isMove = true;img[0].src= data[now];img[1].src= data[next];css(img[0],"top",styles[0]);css(img[0],"left",styles[1]);css(img[1],"top",styles[2]);css(img[1],"left",styles[3]);now = next;move(img[0],target1);move(img[1],target2,function(){isMove = false;});}// 移动function move(el,target,callBack){startMove({el:el,target:target,type: "easeOut",time: 1000});}})(); </script></body></html>//动画形式公式var Tween = {linear: function (t, b, c, d){return c*t/d + b;},easeIn: function(t, b, c, d){return c*(t/=d)*t + b;},easeOut: function(t, b, c, d){return -c *(t/=d)*(t-2) + b;},easeBoth: function(t, b, c, d){if ((t/=d/2) < 1) {return c/2*t*t + b;}return -c/2 * ((--t)*(t-2) - 1) + b;},easeInStrong: function(t, b, c, d){return c*(t/=d)*t*t*t + b;},easeOutStrong: function(t, b, c, d){return -c * ((t=t/d-1)*t*t*t - 1) + b;},easeBothStrong: function(t, b, c, d){if ((t/=d/2) < 1) {return c/2*t*t*t*t + b;}return -c/2 * ((t-=2)*t*t*t - 2) + b;},elasticIn: function(t, b, c, d, a, p){if (t === 0) { return b; }if ( (t /= d) == 1 ) {return b+c; }if (!p) {p=d*0.3; }if (!a || a < Math.abs(c)) {a = c; var s = p/4;} else {var s = p/(2*Math.PI) * Math.asin (c/a);}return -(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;},elasticOut: function(t, b, c, d, a, p){if (t === 0) {return b;}if ( (t /= d) == 1 ) {return b+c;}if (!p) {p=d*0.3;}if (!a || a < Math.abs(c)) {a = c;var s = p / 4;} else {var s = p/(2*Math.PI) * Math.asin (c/a);}return a*Math.pow(2,-10*t) * Math.sin( (t*d-s)*(2*Math.PI)/p ) + c + b;}, elasticBoth: function(t, b, c, d, a, p){if (t === 0) {return b;}if ( (t /= d/2) == 2 ) {return b+c;}if (!p) {p = d*(0.3*1.5);}if ( !a || a < Math.abs(c) ) {a = c; var s = p/4;}else {var s = p/(2*Math.PI) * Math.asin (c/a);}if (t < 1) {return - 0.5*(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;}return a*Math.pow(2,-10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )*0.5 + c + b;},backIn: function(t, b, c, d, s){if (typeof s == 'undefined') { s = 1.70158;}return c*(t/=d)*t*((s+1)*t - s) + b;},backOut: function(t, b, c, d, s){if (typeof s == 'undefined') {s = 2.70158; //回缩的距离}return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b;}, backBoth: function(t, b, c, d, s){if (typeof s == 'undefined') {s = 1.70158; }if ((t /= d/2 ) < 1) {return c/2*(t*t*(((s*=(1.525))+1)*t - s)) + b;}return c/2*((t-=2)*t*(((s*=(1.525))+1)*t + s) + 2) + b;},bounceIn: function(t, b, c, d){return c - Tween['bounceOut'](d-t, 0, c, d) + b;}, bounceOut: function(t, b, c, d){if ((t/=d) < (1/2.75)) {return c*(7.5625*t*t) + b;} else if (t < (2/2.75)) {return c*(7.5625*(t-=(1.5/2.75))*t + 0.75) + b;} else if (t < (2.5/2.75)) {return c*(7.5625*(t-=(2.25/2.75))*t + 0.9375) + b;}return c*(7.5625*(t-=(2.625/2.75))*t + 0.984375) + b;}, bounceBoth: function(t, b, c, d){if (t < d/2) {return Tween['bounceIn'](t*2, 0, c, d) * 0.5 + b;}return Tween['bounceOut'](t*2-d, 0, c, d) * 0.5 + c*0.5 + b;}}// 获取或者设置样式function css(el,attr,val){if(arguments.length == 2){if(el.currentStyle){val = el.currentStyle[attr];} else {val = getComputedStyle(el)[attr];}return parseFloat(val);} else {if(attr == "opacity"){el.style.opacity = val;el.style.filter = "alpha(opacity= "+val*100+")";} else if(attr == "zIndex"){el.style[attr] = Math.round(val);}else {el.style[attr] = val + "px";}}}//执行动画function startMove(init){clearInterval(init.el.timer);var t = 0; var b = {};var c = {};var d = init.time/20;for( var s in init.target){ b[s] = css(init.el,s);c[s] = init.target[s] - b[s];} init.el.timer = setInterval(function(){t++;if(t > d){clearInterval(init.el.timer);init.callBack&&init.callBack();} else {for(var s in init.target){var val = Tween[init.type](t,b[s],c[s],d);css(init.el,s,val);}}},20);}登录后复制以上就是JS每日一题-小demo之JS实现通过键盘方向键操作图片上下左右无缝切换的详细内容，更多请关注9543建站博客其它相关文章！
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