jQuery实现轮播图效果demo

<div id="slideShow">
 <a href="#" class="slide_pic"><img src="../img/phone_photo/p1.jpg" alt="0"></a>
 <a href="#" class="slide_pic"><img src="../img/phone_photo/p2.jpg" alt="1"></a>
 <a href="#" class="slide_pic"><img src="../img/phone_photo/p3.jpg" alt="2"></a>
 <a href="#" class="slide_pic"><img src="../img/phone_photo/p4.jpg" alt="3"></a>
 <a href="#" class="slide_pic"><img src="../img/phone_photo/p5.jpg" alt="4"></a>
 <a href="#" class="slide_pic"><img src="../img/phone_photo/p6.jpg" alft="5"></a>

 <button class="prev_one"> < </button>
 <button class="next_one"> > </button>

 <ul id="mark_box">
  <li class="mark">1</li>
  <li class="mark">2</li>
  <li class="mark">3</li>
  <li class="mark">4</li>
  <li class="mark">5</li>
  <li class="mark">6</li>
 </ul>
</div>

#slideShow{
 width: 330px;
 height: 245px;
 background-color: #999999;
 text-align: center;
 left: 50%;
 margin-left: -165px;
 position: relative;
}
#slideShow .slide_pic{
 position: absolute;
 left: 0;
 top: 0;
}
#slideShow .prev_one{
 position: absolute;
 left: 0;
 top: 45%;
}
#slideShow .next_one{
 position: absolute;
 right: 0;
 top: 45%;
}
#slideShow #mark_box{
 position: absolute;
 bottom: 0;
}

#mark_box .mark{
 width: 20px;
 height: 20px;
 border-radius: 20px;
 padding: 2px;
 text-align: center;
 line-height: 20px;
 background-color: red;
 float: left;
 list-style: none;
 margin: 10px 10px;
 cursor: pointer;
}
#mark_box .active_img{
 background-color: green;
}

$(function(){
 var prev_mark=0;    //点击上一张按钮时候的一个标志位
 var next_mark=0;    //点击下一张按钮时候的一个标志位
 var cur_pic=$('.slide_pic').length-1;   //当前图片的序号

 $('.prev_one').click(function(){
  prev_mark=cur_pic;   //获取当前图片的序号
  if(prev_mark === 0){
   prev_mark=$('.slide_pic').length-1;
  }
  else{
   prev_mark--;
  }
  cur_pic=prev_mark;
  $('.slide_pic').eq(cur_pic).fadeIn(500).siblings('.slide_pic').fadeOut(500);
  $('.mark').eq(cur_pic).addClass('active_img').siblings('.mark').removeClass('active_img');
 });

 $('.next_one').click(function(){
  next_mark=cur_pic;
  if(next_mark === $('.slide_pic').length-1){
   next_mark=0;
  }
  else{
   next_mark++;
  }
  cur_pic=next_mark;
  $('.slide_pic').eq(cur_pic).fadeIn(500).siblings('.slide_pic').fadeOut(500);
  $('.mark').eq(cur_pic).addClass('active_img').siblings('.mark').removeClass('active_img');
 });

 // 轮播图下面的指示点
 $.each($('.mark'),function(index,value){
  $(value).click(function(){
   cur_pic=this.innerHTML-1;
   $('.slide_pic').eq(cur_pic).fadeIn(500).siblings('.slide_pic').fadeOut(500);
   $(this).addClass('active_img').siblings('.mark').removeClass('active_img');
  });
 });

 // 鼠标移入图片则停止轮播；鼠标移出图片则开始轮播
 var slide_timer=setInterval(auto_slide,2000);
 $('#slideShow').mouseenter(function(){
  clearInterval(slide_timer);
 });
 $('#slideShow').mouseleave(function(){
  slide_timer=setInterval(auto_slide,2000);
 });

 // 自动轮播函数
 function auto_slide(){
  if(cur_pic === $('.slide_pic').length-1){
   cur_pic =0;
  }
  else {
   cur_pic++;
  }
  $('.slide_pic').eq(cur_pic).fadeIn(500).siblings('.slide_pic').fadeOut(500);
  $('.mark').eq(cur_pic).addClass('active_img').siblings('.mark').removeClass('active_img');
 }
});