<div class="lunbo">
 <div class="picture">
  <ul>
  <li><img src="img/1.jpg"></li>
  <li><img src="img/2.jpg"></li>
  <li><img src="img/3.jpg"></li>
  <li><img src="img/4.jpg"></li>
  <li><img src="img/5.jpg"></li>
  </ul>
 </div>
 <ul class="btn">
  <li id="active"><div></div></li>
  <li><div></div></li>
  <li><div></div></li>
  <li><div></div></li>
  <li><div></div></li>
 </ul>
 <div id="left"><img src="img/left.png"></div>
 <div id="right"><img src="img/right.png"></div>
 </div>

*{
 margin: 0;
 padding: 0;
}
.lunbo{
 width: 100%;
 height: 410px;
 position: relative;
 text-align: center;

}
.picture{
 width: 1190px;
 height: 480px;
 position: absolute;
 top: 0;
 left: 88px;
 overflow: hidden;
}
.picture li{
 width: 1190px;
 height: 410px;
 margin: 0 auto;
 list-style-type: none;
 margin-top: 70px;
 position: absolute;
 overflow: hidden;
 top: ;
 left: ;
}
.picture img{
 cursor: pointer;
}
.btn{
 display: block;
 width: 150px;
 height: 30px;
 position: absolute;
 top: 460px;
 left: 130px;
}
.btn li{
 display: block;
 width: 10px;
 height: 10px;
 background-color:white;
 list-style-type: none;
 position: absolute;
 top: 0px;
 left: 0px;
 border-radius: 10px;
 cursor: pointer;
}
#active{
 background-color: #03A9F4;
}
.btn li:hover{
 background-color:#9e9e9e;
}
#left{
 position: absolute;
 top: 240px;
 left: 90px;
 cursor: pointer;
}
#right{
 position: absolute;
 top: 240px;
 left: 1220px;
 cursor: pointer;
}

function setCirPos(){
 // 设置圆点的位置
 $cir.each(function(){
  $(this).css({
  left:$(this).index()*25 + 500
  })
 });
 // 设置刚开始不显示的图片的位置
 $pic.slice(1).each(function(){
  $(this).css({
  left:$picW
  })
 })
 }

var $cir = $('.btn li');
 var $pic = $('.picture li');
 var $picW = $pic.width();
 var $oLeft = $('#left');
 var $oRight = $('#right');
 // 当前图片
 var nowPic = 0;
 // 防止用户连续的点击
 var canClick = true;
 // 定时器
 var timer = null;

// 设置定时器自动切换
 timer = setInterval(function(){
 auto();
 },2000);
 //自动切换 
 function auto(){
 var index = nowPic + 1;
 if(index < 0){
  index = 4;
 }else if(index > 4){
  index = 0;
 }
 $pic.eq(index).css('left',$picW);
 $pic.eq(nowPic).animate({left:-$picW}, 400);
 $pic.eq(index).animate({left:0}, 400);
 nowPic = index;
 // 设置当前图片的圆点的样式
 $cir.eq(nowPic).attr('id','active').siblings().attr('id','');
 }

function lunbo(){
 $cir.click(function(){
  clearInterval(timer);
  var index = $(this).index();
  if(index > nowPic){
  // 点击的值大于当前的值
  $pic.eq(index).css('left',$picW);
  $pic.eq(nowPic).animate({left:-$picW},400);
  }else if(index < nowPic){
  // 点击的值小于当前的值
  $pic.eq(index).css('left',-$picW);
  $pic.eq(nowPic).animate({left:$picW},400);
  }
  $pic.eq(index).animate({left:0},400,function(){
  timer = setInterval(function(){
   auto();
  },3000);
  });
  nowPic = index;
  // 设置当前图片的圆点的样式
  $cir.eq(nowPic).attr('id','active').siblings().attr('id','');
 });
 }

// 点击左箭头
 $oLeft.click(function(){
 if(canClick){
  clearInterval(timer);
  canClick = false;
  var index = nowPic - 1;
  if(index < 0){
  index = 4;
  }else if(index > 4){
  index = 0;
  }
  $pic.eq(index).css('left',-$picW);
  $pic.eq(nowPic).animate({left:$picW}, 400);
  $pic.eq(index).animate({left:0}, 400,function(){
  canClick = true;
  timer = setInterval(function(){
   auto();
  },3000);
  });
  nowPic = index;
  // 设置当前图片的圆点的样式
  $cir.eq(nowPic).attr('id','active').siblings().attr('id','');
 }
 })

// 点击右箭头
 $oRight.click(function(){
 if(canClick){
  clearInterval(timer);
  canClick = false;
  var index = nowPic + 1;
  if(index < 0){
  index = 4;
  }else if(index > 4){
  index = 0;
  }
  $pic.eq(index).css('left',$picW);
  $pic.eq(nowPic).animate({left:-$picW}, 400);
  $pic.eq(index).animate({left:0}, 400,function(){
  canClick = true;
  timer = setInterval(function(){
   auto();
  },3000);
  });
  nowPic = index;
  // 设置当前图片的圆点的样式
  $cir.eq(nowPic).attr('id','active').siblings().attr('id','');
 }
 })