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本文我们将和大家分享原生js写轮播实例教程,结合html、css代码大家一起来学习一下吧。
<style type="text/css"> #box{ width:1140px; height: 380px; border: 1px solid #000; margin: 0 auto; position: relative; } img{ position: absolute; top: 0; left: 0; } a{ display: block; width:60px; height: 50px; text-align: center; line-height: 50px; background: #FFFAE8; display: none; position: absolute; } #prev{ top:50%; left: 10px; } #next{ top:50%; right: 10px; } p{ width:30px; height: 30px; background-color: #ccc; border-radius: 50%; float: left; margin:0 10px; border:2px solid #fff; margin:10px; } .spot{ width:272px; height:40px; position: absolute; bottom:10px; left: 40%; } .on{ background: red; } </style>
html代码
<p id="box"> <img src="img/j_banner1.jpg" alt="" /> <img src="img/j_banner2.jpg" alt="" /> <img src="img/j_banner3.jpg" alt="" /> <img src="img/j_banner4.jpg" alt="" /> <img src="img/j_banner5.jpg" alt="" /> <p class="spot"> <p class="on"></p> <p></p> <p></p> <p></p> <p></p> </p> <a id="prev" href="javascript:;">前一张</a> <a id="next" href="javascript:;">后一张</a> </p>
javascript代码
<script type="text/javascript"> var pic = document.getElementsByTagName("img"); var btn1 = document.getElementById("prev"); var btn2 = document.getElementById("next"); var _box = document.getElementById("box"); var _p = document.getElementsByTagName("p"); var num = 0; var timer = null; for(var j = 1;j < pic.length;j++){ setOpacity(pic[j],0); } //透明度封装 function setOpacity(elem,level){ if(elem.filters){ elem.style.filter = "alpha(opacity=" + level + ")"; }else{ elem.style.opacity = level / 100; } } //淡如效果 function fadeIn(elem){ setOpacity(elem,0); for(var i = 0;i <= 100;i++){ (function(pos){ setTimeout(function(){ setOpacity(elem,pos) },10 * pos); })(i); } } //淡出效果 function fadeOut(elem){ for(var i = 0;i <= 100;i++){ (function(pos){ setTimeout(function(){ setOpacity(elem,pos); },10 *(100 - pos)); })(i); } } function converPrev(){ if(num == 0){ fadeOut(pic[num]); num = 4; fadeIn(pic[num]); }else{ fadeIn(pic[num-1]); fadeOut(pic[num]); num--; } showDot(num); } function converNext(){ if(num == 4){ fadeOut(pic[num]); num = 0; fadeIn(pic[num]); }else{ fadeIn(pic[num+1]); fadeOut(pic[num]); num++; } showDot(num); } //小圆点背景色 function showDot(n){ for(var k = 0;k < _p.length;k++){ _p[k].className=""; } _p[n].className = "on"; } //小圆点点击事件 for(var n = 0;n < _p.length;n++){ _p[n].setAttribute("aindex",n); _p[n].onclick = function(){ var newIndex = this.getAttribute("aindex") * 1; fadeOut(pic[num]); fadeIn(pic[newIndex]); num = newIndex; showDot(num); } } function autoPlay(){ timer = setInterval(converNext,2000); } autoPlay(); btn1.onclick = converPrev; btn2.onclick = converNext; _box.onmouseout = function(){ autoPlay(); btn1.style.display = "none"; btn2.style.display = "none"; } _box.onmouseover = function(){ clearInterval(timer); btn1.style.display = "block"; btn2.style.display = "block"; } </script>
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