原生js实现焦点轮播图效果

2017-01-13 08:21:48来源:作者:人点击

原生js焦点轮播图主要注意这几点:

1、前后按钮实现切换,同时注意辅助图

2、中间的button随着前后按钮对应切换,同时按button也能跳转到相应的index

3、间隔调用与无限轮播。

4、注意在动画时要停止按钮,或者说上一个动画完毕下一个动画才能执行

5、另外在切换图片的时候,底部的Button动画效果,是从底部开始往上升的,要用到transform:scale()和transform-origin:0 100%两个转换属性,代码如下

<!DOCTYPE html><html> <head> <meta charset="utf-8"/> <meta name="viewpoint" content="width=device-width,initial-scale=1,user-scalable="no"> <title>20170101</title> <style type="text/css"> a{text-decoration:none;color:#3DBBF5;} .wrapper{width:750px;height:350px;background:#001032;margin:20px auto;text-align:center;box-shadow:0 0 12px 2px hsla(0,20%,30%,0.5);padding:10px 15px;position:relative;} .effect{position:relative;cursor:pointer;} .effect:hover{color:#02a0e9;} .effect:before{width:100%;display:inline-block !important;position:absolute;height:1px;background:#02a0e9;transition:all 0.4s ease-in-out;-webkit-transition:all 0.4s ease-in-out;-moz-transition:all 0.4s ease-in-out;transform:scale(0,1);content:'';bottom:-5px;left:0;} .effect:hover:before{transform:scale(1);-webkit-transform:scale(1);} #lunBo{margin-top:20px;overflow:hidden;height:300px;width:750px;position:relative;} #list{position:absolute;z-index:22;height:300px;width:5250px;} #list img{float:left;} #buttons { position: absolute; height: 20px; width: 150px; z-index: 99; bottom: 20px; left: 40%;} span { cursor: pointer; float: left; width: 10px; height: 5px; background: #333; margin-right: 10px;}  .on { background: yellow;transition:all 0.4s ease-in-out;-webkit-transition:all 0.4s ease-in-out;-moz-transition:all 0.4s ease-in-out;transform:scale(1,4);-ms-transform:scale(1,4);-moz-transform:scale(1,4);-webkit-transform:scale(1,4);transform-origin:0% 0%;-webkit-transform-origin:0% 100%;-moz-transform-origin:0% 100%;}  .arrow { cursor: pointer; display: none; line-height: 39px; text-align: center; font-size: 36px; font-weight: bold; width: 40px; height: 100px; line-height:100px;position: absolute; z-index: 92; top: 30%; background-color: RGBA(0,0,0,.3); color: #fff;} .arrow:hover { background-color: RGBA(0,0,0,.7);} #lunBo:hover .arrow { display: block;} #prev { left: 0px;} #next { right: 0px;} </style> </head> <body> <div class="wrapper">  <a class="effect" href="#">2016完了,2017来了</a>  <div id="lunBo">  <div id="list" style="left:-750px;"><img src="http://cdn.attach.qdfuns.com/notes/pics/201701/03/175856saeagzgsnwal15n5.jpg" alt=""/><img src="http://cdn.attach.qdfuns.com/notes/pics/201701/02/235009drzwcaxem2wfgmdc.jpg" alt=""/><img src="http://cdn.attach.qdfuns.com/notes/pics/201701/03/175856m1bhxxx1d8jfnblb.jpg" alt=""/><img src="http://cdn.attach.qdfuns.com/notes/pics/201701/03/175856z48mfrrr8u064rf6.jpg" alt=""/><img src="http://cdn.attach.qdfuns.com/notes/pics/201701/03/175856e95yze236lvq7y2a.jpg" alt=""/><img src="http://cdn.attach.qdfuns.com/notes/pics/201701/03/175856saeagzgsnwal15n5.jpg" alt=""/><img src="http://cdn.attach.qdfuns.com/notes/pics/201701/02/235009drzwcaxem2wfgmdc.jpg" alt=""/>  </div>  <div id="buttons"><span index="1" class="on"></span><span index="2"></span><span index="3"></span><span index="4"></span><span index="5"></span>  </div>  <a href="javascript:;" id="prev" class="arrow"><</a>  <a href="javascript:;" id="next" class="arrow">></a>  </div> </div> <script> window.onload = function(){  var lunBo = document.getElementById('lunBo');  var list = document.getElementById('list');  var buttons = document.getElementById('buttons').getElementsByTagName('span');  //console.log(buttons);  var prev = document.getElementById('prev');var next = document.getElementById('next');  var index = 1;  var animated = false;  var interval = 3000;  var timer;  //显示按钮的索引  function showButton(){  for(var i = 0 ; i < buttons.length ; i++){if( buttons[i].className == 'on' ){buttons[i].className = '';break;};  };  buttons[index - 1].className='on';  };  function play(){  timer = setTimeout(function () {  next.onclick();  play();}, interval);  };  function stop(){  clearTimeout(timer);  };  //向前按钮  next.onclick = function () {if (animated) {  return;}if (index == 5) {  index = 1;}else {  index += 1;}animate(-750);showButton();};prev.onclick = function () {if (animated) {  return;}if (index == 1) {  index = 5;}else {  index -= 1;}animate(750);showButton();};  //parseInt()转换为纯数值  function animate(offset){  animated = true;  var newLeft = parseInt(list.style.left) + offset; //目标值  var time = 300; //位移总时间为300  var interval = 10; //  var speed = offset/(Math.floor(time/interval)); //每次位移量  function go(){  if( (speed < 0 && parseInt(list.style.left) > newLeft) || ( speed > 0 && parseInt(list.style.left) < newLeft) ){list.style.left = parseInt(list.style.left) + speed + 'px'; setTimeout(go,interval);  }else{animated = false;list.style.left = newLeft+ 'px';  //现在的位移if( newLeft > -750){//假的辅助图list.style.left = -3750 + 'px';}if( newLeft < -3750){list.style.left = -750 + 'px';}  }  };  go(); };  //小按钮  for(var i=0;i < buttons.length;i++){  buttons[i].onclick = function(){  if(this.className == 'on'){return;  };var myIndex = parseInt(this.getAttribute('index'));var offset = -750 * (myIndex - index);animate(offset);  index = myIndex;  showButton();  }  }  lunBo.onmouseout = play;  lunBo.onmouseover = stop;  play(); } </script> </body></html>


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