JQuery和html+css实现带小圆点和左右按钮的轮播图实

/*轮播图 左右按钮 小白点*/
  #second_div{
  margin-top: 160px;
  }
  .img_box{
  overflow: hidden;
  width:100%;
  height:420px;
  border:1px solid;
  position:relative;
 }  
  .img_box img{
  width:100%;
  position:absolute;
 }  
  .ul5{
  list-style: none;
  position:absolute;
  left:580px;
  top:565px;
  } 
  .ul5 li{
  float:left;
  margin-left:20px;
  width:40px;
  height:5px;
  border:0px;
  background:lawngreen;
 }
  .d1,.d2{
  width:50px;
  height:60px;
  background-color: rgba(10,10,10,0.5);
  text-align: center;
  font-size:26px;
  font-weight: 800px;
  line-height:60px;
  cursor: pointer;
  }
  .d1{
  position:absolute;
  top:373px;
  left:25px;
  }
  .d2{
  position:absolute;
  top:373px;
  left:1445px;
  }

<!-- 轮播图 -->
<div id="second_div">
<div class="img_box">
 <img src="img/ban1.jpg">
 <img src="img/ban2.jpg">
 <img src="img/ban3.jpg">
 <img src="img/ban4.png">
</div> 
 <ul class="ul5">
 <li></li>
 <li></li>
 <li></li>
 <li></li>
</ul>
 <div class="d1"><</div>
 <div class="d2">></div>
</div>

<script type="text/javascript">
  $(document).ready(function(){
//搜索按钮
 $("#ss").click(function(){
  var new_li = $("<li>"+ $("#skuang").val() +"</li>");
  $("#d1 ul").append(new_li);
  $("#d1").hide();
  $("#skuang").val("");

  })

  $("#skuang").focus(function(){
   $("#d1").css("display","block");
  });
  
  $("#skuang").blur();
  $("#qingch").click(function(){
   $("#d1 li:gt(0)").remove();
   $("#d1").hide();
   
  });

//轮播图
  var img=$(".img_box img");
  var li=$(".ul5 li");
  var divW=$(".img_box").width();
  var len=$(".img_box img").length;
  img.css("left",divW);
  img.eq(0).css("left",0);
  li.eq(0).css("background","red");
  var index=0;
  var next=0;
  function show(){
   next++;
   if(next==len){
    next=0;
   }
   img.eq(next).css("left",divW);
   img.eq(index).animate({"left":-divW});
   img.eq(next).animate({"left":0});
   li.eq(next).css("background","red");
   li.eq(index).css("background","lawngreen");
   index=next;
  }
  t=setInterval(show,2000);
  function show1(){
   next--;
   if(next==-1){
    next=len-1;
   }
   img.eq(next).css("left",-divW);
   img.eq(index).animate({"left":divW});
   img.eq(next).animate({"left":0});
   li.eq(next).css("background","red");
   li.eq(index).css("background","lawngreen");
   index=next;     
  }
  img.hover(function(){
   clearInterval(t);     
  },function(){
   t=setInterval(show,2000);
  })
  //左右按钮
  $(".d2").mousedown(function(){
   clearInterval(t);
   show();
  })
  $(".d2").mousedown(function(){
     t=setInterval(show,2000);
  }) 
  $(".d1").mousedown(function(){
   clearInterval(t);
     show1();
  })
  $(".d1").mousedown(function(){
   t=setInterval(show,2000);
  })
  //小白点 点击
  li.mousedown(function(){
   num=$(this).index();
   if(num==next){
    return;
   }else if(num<next){
    clearInterval(t);
    img.eq(num).css("left",-divW);
     img.eq(index).animate({"left":divW});
     img.eq(num).animate({"left":0});
     li.eq(num).css("background","red");
     li.eq(index).css("background","lawngreen");
     index=num;
     next=num;
   }else if(num>next){
    clearInterval(t);
     img.eq(num).css("left",divW);
     img.eq(index).animate({"left":-divW});
     img.eq(num).animate({"left":0});
     li.eq(num).css("background","red");
     li.eq(index).css("background","lawngreen");
     index=num;
     next=num;
   }
 })
    li.mouseup(function(){
     t=setInterval(show,2000);
   })
  })
 </script>