原生js实现简单的焦点图效果
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原生js实现简单的焦点图效果
小編覺得挺不錯的,現在分享給大家,幫大家做個參考.
用到一些封裝好的運動函數，主要是定時器
效果為圖片和圖片的描述定時自動更換
<!DOCTYPE html> <html><head><meta charset="UTF-8"><title></title><style type="text/css">ul,li,p,h3 {padding: 0;margin: 0;list-style: none;}img {border: none;vertical-align: top;}#bg_box {width: 1000px;height: 590px;margin: 50px auto;position: relative;background: url(img/bg1.jpg) no-repeat; }.pic {width: 440px;height: 274px;position: absolute;top: 50px;left: 220px;overflow: hidden;}.li_box {width: 1760px;height: 274px;position: absolute;left: 0;}.tags {width: 440px;height: 80px;position: absolute;bottom: -80px;background-image: linear-gradient(0deg, rgba(0, 0, 0, 0.4) 0%, rgba(255, 255, 255, 0) 100%);color: white;padding-left: 20px;padding-top: 15px;box-sizing: border-box;}.tags:nth-of-type(1) {/*bottom: 0;*/}.img {float: left;width: 440px;height: 274px;}h3 {font: bold 20px/30px "微軟雅黑"; }p {font: 16px/30px "微軟雅黑"; }</style><script src="tween.js"></script><script src="commom.js"></script><script type="text/javascript">window.onload = function() {//獲取元素var liBbox = $('ul')[0];var li = $('li');var tags = $('.tags')var num = 0; //設置初始位置 Change()function Change() {var M = tags[num];MTween(M, 'bottom', 0, 500, 'px', 'linear', function() { //先讓描述內容出現num if(num > li.length - 1) { //邊界設置。return;}setTimeout(function() {MTween(M, 'bottom', -80, 500, 'px', 'linear', function() { //讓描述內容不顯示MTween(liBbox, 'left', -num * 440, 800, 'px', 'linear', function() {Change();}); //切換圖片 });}, 1000)});}}</script></head><body><section id="bg_box"><div class="pic"><ul class="li_box"><li><img class="img" src="img/a5.gif"></li><li><img class="img" src="img/a6.gif"></li><li><img class="img" src="img/a7.gif"></li><li><img class="img" src="img/a8.gif"></li></ul><div class="tags"><h3 class="title">下雨了~~~</h3><p class="tag">這是一個適合在家睡覺的日子!!</p></div><div class="tags"><h3 class="title">包餃子~~~</h3><p class="tag">一只會居家過日子的小狐貍！！</p></div><div class="tags"><h3 class="title">生氣了~~~</h3><p class="tag">吃掉好吃的就不生氣了！！</p></div><div class="tags"><h3 class="title">出發了~~~</h3><p class="tag">來一段說走就走的旅行!!</p></div></div></section></body></html>commom.js
function MTween(obj,attr,end,duration,unit,way,callBack){if(obj.isAnim) return;//obj開始運動了 自定義屬性obj.isAnim = true;if(!way){ //如果用戶沒有選擇運動方式就默認勻速way = 'linear';}if(!unit){ //如果用戶沒有選擇運動方式就默認勻速unit = '';}var start = parseFloat(getStyle(obj,attr));//起始位置 // var end = 1000;//目標點 // var duration = 1000;//動畫執行的總時間 單位是毫秒var startTime = Date.now();var s = end - start; //總路程// var v = s/duration; //計算出來的速度//每次20ms走一幀 clearInterval(timer);var timer = 0;timer = setInterval(function(){var endTime = Date.now();//計算出當前時間var t = endTime-startTime;if(t>=duration){t = duration;clearInterval(timer);//到達目標點要清除定時器 }// obj.style[attr] = t*s/duration start 'px'; // console.log(Tween[way](t,start,s,duration))obj.style[attr] = Tween[way](t,start,s,duration) unit;//透明度的兼容處理if(attr=='opacity'){obj.style.filter = 'Alpha(opacity=' Tween[way](t,start,s,duration)*100 ')';}if(t==duration){obj.isAnim = false;//等到上一個動畫完成 然后再調用if(callBack){callBack();}}},20); }tween.js
/* * t : time 已過時間 當前時間-初始時間 * b : begin 起始值 * c : count 總的運動值 總路程 * d : duration 持續時間 總時間 * * s = vt; => c = t*c/d 這里只計算總共要運動的路程 ，不包括起始位置 * * attrVal = t*c/d b; * * 曲線方程 * * http://www.cnblogs.com/bluedream2009/archive/2010/06/19/1760909.html * *///Tween.linear();var Tween = {linear: function (t, b, c, d){ //勻速return c*t/d b; },easeIn: function(t, b, c, d){ //加速曲線return c*(t/=d)*t b; },easeOut: function(t, b, c, d){ //減速曲線return -c *(t/=d)*(t-2) b; },easeBoth: function(t, b, c, d){ //加速減速曲線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){ //加加速曲線return c*(t/=d)*t*t*t b; },easeOutStrong: function(t, b, c, d){ //減減速曲線return -c * ((t=t/d-1)*t*t*t - 1) b; },easeBothStrong: function(t, b, c, d){ //加加速減減速曲線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){ //正弦衰減曲線（彈動漸入）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){ //*正弦增強曲線（彈動漸出）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){ //回退加速（回退漸入）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 = 3.70158; //回縮的距離 }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){ //彈球減振（彈球漸出）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;} }?
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