本文实例为大家分享了js轮播图焦点的具体代码，供大家参考，具体内容如下
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>轮播图焦点</title> <meta content="还是有地点小瑕疵，1左转变4,4右转变1的时候，图片切换有空白，换下动画模式应该可以？"> <style> *{ padding: 0; margin: 0; } ul{ list-style: none; } .scroll{ width: 300px; height: 200px; border: 1px solid red; margin: 100px auto; position: relative; overflow: hidden; } .scroll ul.imgUl{ width: 400%; position: absolute; top: 0; left: 0; } .scroll ul.imgUl li{ float: left; } .scroll .imgUl img{ vertical-align: middle; /* 消除图片间3px的间距 */ } .scroll ul.focus{ position: absolute; left: 50%; bottom: 10px; margin-left: -80px; } .scroll ul.focus li{ width: 20px; height: 20px; padding: 5px; text-align: center; margin-right: 10px; border: 2px solid yellow; float: left; color: red; font-weight: 700; background-color: #333; color: white; } .scroll ul.focus li.current{ background-color: deeppink; } .scroll .arrow{ width: 100%; position: absolute; top: 50%; left: 0; margin-top: -20px; display: none; } .scroll .arrow div{ width: 40px; height: 40px; font: 700 18px/40px "宋体"; text-align: center; background: rgba(0,0,0,.3); color: #fff; cursor: pointer; } .scroll .arrow div.left{ float: left; } .scroll .arrow div.right{ float: right; } </style> <script> window.onload = function(){ function $(id){ return document.getElementById(id);} var scrollDiv = $('scrollDiv'); var imgul = $('images'); var focusUl = $('focuses'); var imgLis = imgul.children; var leader = 0, target = 0; var curIndex = 0;//记录当前图片的序号 var leftArrow = $('leftArrow'); var rightArrow = $('rightArrow'); //可自动生成和图片对应的序号 /*for(var i=0; i< imgLis.length; i++){ var newLi = document.createElement('li'); newLi.innerHTML=i+1; focusUl.appendChild(newLi); }*/ var focusLis = focusUl.children; for(var i=0; i<focusLis.length; i++){ focusLis[i].index = i; focusLis[i].onmouseover = function(){ curIndex = this.index; switchFocus(curIndex); target = -this.index * 300; } } scrollDiv.onmouseover = function(){ $('arrowDiv').style.display="block"; clearInterval(timer); } scrollDiv.onmouseout = function(){ $('arrowDiv').style.display="none"; timer = setInterval(autoPlay,3000); } leftArrow.onclick = function(){ target +=300; curIndex = curIndex==0 ? focusLis.length-1 : curIndex-1; switchFocus(curIndex); } rightArrow.onclick = function(){ target -=300; curIndex = (curIndex+1) % focusLis.length; switchFocus(curIndex); } //缓动效果 setInterval(function(){ if(target > 0){ target = -900; leader = -1000; }else if(target < -900){ target = 0; leader = 100; } leader = leader + (target - leader) / 10; imgul.style.left = leader +"px"; } ,10); switchFocus(0); //每隔3s左移图片 var timer = null; timer = setInterval(autoPlay,3000); function autoPlay(){ target -= 300; curIndex = (curIndex+1) % focusLis.length; switchFocus(curIndex); } //转换样式 function switchFocus(curIndex){ for(var j=0; j<focusLis.length;j++){ focusLis[j].className=""; } focusLis[curIndex].className="current"; } } </script></head><body> <div class="scroll" id="scrollDiv"> <ul class="imgUl" id="images"> <li><img src="images/01.jpg" alt=""></li> <li><img src="images/02.jpg" alt=""></li> <li><img src="images/03.jpg" alt=""></li> <li><img src="images/04.jpg" alt=""></li> </ul> <ul class="focus" id="focuses"> <li>1</li> <li>2</li> <li>3</li> <li>4</li> </ul> <div class="arrow" id="arrowDiv"> <div class="left" id="leftArrow"><</div> <div class="right" id="rightArrow">></div> </div> </div></body></html>以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持武林网。
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