js method to use mouse dragging to switch pictures_javascript skills

The example in this article describes the js method of using mouse drag to switch pictures. Share it with everyone for your reference. The specific implementation method is as follows:

<script type="text/javascript" src="js/jquery.min.js"></script>
<style type="text/css">
*{margin:0;padding:0;}
.m-slider{width:600px;margin:0 auto 10px !important;}
#slider{width:100%; overflow:hidden;}
.m-slider .cnt{position:relative;left:0;width:2000%;}
.m-slider .cnt li{float:left;width:5%; height: 450px;
overflow: hidden;
}
.m-slider .cnt img{
display:block;width:100%;height:450px;
vertical-align:top;
}
.m-slider .cnt p{margin:10px 0;}
.m-slider .icons{text-align:center;color:#000;
position: relative; z-index: 999; margin-top: -20px;
}
.m-slider .icons span{
background: #fff; border-radius: 5px;
box-shadow: 0 0 2px #b0b0b0 inset; display: inline-block;
height: 10px; margin: 0 5px; overflow: hidden;
text-indent: -99em; width: 10px;
}
.m-slider .icons .curr{
background:#f80; box-shadow: 0 0 2px #f60 inset
}
</style>
<div class="m-slider">
<div id="slider">
<ul id="m-slider" class="cnt">
<li><a href="#1"><img src="/static/imghwm/default1.png"  data-src="images/mofe.jpg"  class="lazy" alt="" /></a></li>
<li><a href="#2"><img src="/static/imghwm/default1.png"  data-src="images/9hll.jpg"  class="lazy" alt="" /></a></li>
<li><a href="#3"><img src="/static/imghwm/default1.png"  data-src="images/p2bb.jpg"  class="lazy" alt="" /></a></li>
<li><a href="#4"><img src="/static/imghwm/default1.png"  data-src="images/3srp.jpg"  class="lazy" alt="" /></a></li>
<li><a href="#1"><img src="/static/imghwm/default1.png"  data-src="images/ft9s.jpg"  class="lazy" alt="" /></a></li>
</ul>
</div>
<div id="icons" class="icons"><span class="curr">1</span>
<span>2</span> <span>3</span> <span>4</span> <span>5</span>
</div>
</div>
<script type="text/javascript">
jQuery(document).ready(function($){
 var $slider = $('#m-slider');
 var $icons = $('#icons');
 var $li = $slider.children('li');
 var WIDTH = $li.width();
 var SIZE = $li.size();
 $slider.append($li.first().clone());
 //console.log(WIDTH + '-' + SIZE);
 var ox,mx,ux,sumx,scroll,i=0,bool=false,staut=true;
 $li.find('a').click(function(){
 //阻止轮播元素的默认点击事件
  return false;
 });
 $slider.mousedown(function(e){
 //鼠标左键轮播区域
  if(e.target.tagName == 'IMG' && e.button == 0){
 //左键图片
   staut = true;
  //初始化拖拽,状态为true,可以触发点击事件
   sumx = 0;
   //初始化鼠标偏移为0
   bool = true;
   //记录左键状态
   ox = e.pageX;
   //记录鼠标初始坐标
   scroll = $slider.parent().scrollLeft();
   //记录初始轮播水平滚动偏移
   e.preventDefault();
   //阻止鼠标点击默认事件
  }
 });
 $slider.mousemove(function(e){
 //鼠标在轮播区域移动
  if(bool){//左键状态
   staut = false;
   //已经拖拽,状态为false,不再触发点击事件
   mx = e.pageX;
   //记录鼠标实时坐标
   sumx = ox - mx;
   //记录鼠标坐标偏移
   $slider.parent().scrollLeft(scroll+sumx);
  }
 });
 $slider.mouseout(function(e){
 //鼠标离开轮播区域
  if(bool){
 //左键状态
   staut = true;
   //已经拖拽,但是离开了轮播区域,
   //状态为true,可以触发点击事件
   bool = false;//释放左键状态
   sumx > 0 && i < SIZE && i++;//下一个
   sumx < 0 && i > 0 && i--;//上一个
   $slider.parent().stop().animate({scrollLeft:i*WIDTH},300,function(){
    if(i == SIZE){
     i = 0;
     $slider.parent().scrollLeft(0);
    }
    $icons.find('.curr').removeClass('curr').end().children().eq(i).addClass('curr');
   });//完成拖拽
  }
 });
 $slider.mouseup(function(e){
 //鼠标释放,完成click事件
  bool = false;
  //释放左键状态
  if(staut && e.button == 0){
  //没有拖拽或者拖拽失效,且是左键,触发点击事件
   window.location.href = $(e.target).parent().attr('href');
   //触发点击事件
  }else if(!staut && e.button == 0){
  //成功拖拽,且是左键
   sumx > 0 && i < SIZE && i++;//下一个
   sumx < 0 && i > 0 && i--;//上一个
   $slider.parent().stop().animate({scrollLeft:i*WIDTH},300,function(){
    if(i == SIZE){
    //最后一个
     i = 0;
     $slider.parent().scrollLeft(0);//归位
    }
    $icons.find('.curr').removeClass('curr').end().children().eq(i).addClass('curr');
   });//完成拖拽
  }
 });
 function setSlider(){
   i < SIZE && i++;//下一个
   $slider.parent().stop().animate({scrollLeft:i*WIDTH},300,function(){
    if(i == SIZE){//最后一个
     i = 0;
     $slider.parent().scrollLeft(0);
    }
    $icons.find('.curr').removeClass('curr').end().children().eq(i).addClass('curr');
   });//完成拖拽
 }
 var timer = setInterval(function(){
  setSlider();
 },3000);
 $slider.hover(function(){
  if(timer){
   clearInterval(timer);
   timer = null;
  }
 },function(){
  timer = setInterval(function(){
   setSlider();
  },3000);
 });
 $(window).resize(function(){
  WIDTH = $li.width();
  $slider.parent().scrollLeft(i*WIDTH);//归位
  //console.log(WIDTH + '-' + i);
 });
});
</script>

I hope this article will be helpful to everyone’s JavaScript programming design.