js插件实现图片滑动验证码

/** 
 * Created by lgy on 2017/10/21. 
 * 图片验证码 
 */ 
(function ($) { 
 $.fn.imgcode = function (options) { 
  //初始化参数 
  var defaults = { 
   callback:"" //回调函数 
  }; 
  var opts = $.extend(defaults, options); 
  return this.each(function () { 
   var $this = $(this);//获取当前对象 
   var html = '
' + 
    '
' + 
    '
' + 
    '
' + 
    '
' + 
    '
' + 
    '
' + 
    '
刷新
' + 
    '
' + 
    '
' + 
    '
' + 
    '按住滑块，拖动完成上方拼图' + 
    '
'; 
   $this.html(html); 
 
   //定义拖动参数 
   var $divMove = $(this).find(".code-btn-img"); //拖动按钮 
   var $divWrap = $(this).find(".code-btn");//鼠标可拖拽区域 
   var mX = 0, mY = 0;//定义鼠标X轴Y轴 
   var dX = 0, dY = 0;//定义滑动区域左、上位置 
   var isDown = false;//mousedown标记 
   if(document.attachEvent) {//ie的事件监听，拖拽div时禁止选中内容，firefox与chrome已在css中设置过-moz-user-select: none; -webkit-user-select: none; 
    $divMove[0].attachEvent('onselectstart', function() { 
     return false; 
    }); 
   } 
   //按钮拖动事件 
   $divMove.on({ 
    mousedown: function (e) { 
     //清除提示信息 
     $this.find(".code-tip").html(""); 
     var event = e || window.event; 
     mX = event.pageX; 
     dX = $divWrap.offset().left; 
     dY = $divWrap.offset().top; 
     isDown = true;//鼠标拖拽启 
     $(this).addClass("active"); 
     //修改按钮阴影 
     $divMove.css({"box-shadow":"0 0 8px #666"}); 
    } 
   }); 
   //鼠标点击松手事件 
   $(document).mouseup(function (e) { 
    var lastX = $this.find(".code-mask").offset().left - dX - 1; 
    isDown = false;//鼠标拖拽启 
    $divMove.removeClass("active"); 
    //还原按钮阴影 
    $divMove.css({"box-shadow":"0 0 3px #ccc"}); 
    checkcode(lastX); 
   }); 
   //滑动事件 
   $divWrap.mousemove(function (event) { 
    var event = event || window.event; 
    var x = event.pageX;//鼠标滑动时的X轴 
    if (isDown) { 
     if(x>(dX+30) && x

.code_bg{ 
 position: fixed; 
 top:0; 
 left: 0; 
 right:0; 
 bottom:0; 
 background-color: rgba(0,0,0,.5); 
 z-index: 99; 
} 
.icon-login-bg{ 
 background-image: url(../img/icon/loginicon.png); 
 background-repeat: no-repeat; 
} 
.code-con{ 
 position: absolute; 
 top:100px; 
  
 left: 50%; 
 margin-left: -160px; 
 background-color: #fff; 
 z-index: 100; 
 -moz-user-select: none; 
 -webkit-user-select: none; 
} 
.code-img{ 
 margin: 5px 5px; 
 padding: 5px 5px; 
 background-color: #f5f6f7; 
} 
.code-img img{ 
 display: block; 
} 
.icon-w-25{ 
 display: inline-block; 
  
  
 text-indent: -9999px; 
} 
.icon-push{ 
 cursor: pointer; 
 background-position: -149px -95px; 
} 
.code-push{ 
  
} 
.code-btn{ 
 position: relative; 
  
 text-align: center; 
 color: #999; 
 margin: 10px 10px; 
 box-sizing: border-box; 
 background-color: #f5f6f7; 
 border-radius: 15px; 
 border: 1px solid #e1e1e1; 
} 
.code-btn-m{ 
 position: absolute; 
  
  
 border-radius: 50%; 
 background-color: #f5f6f7; 
 border: 1px solid #e1e1e1; 
 z-index: 5; 
 top:-8px; 
 left: 10px; 
 box-shadow: 0 0 3px #ccc; 
 cursor: pointer; 
 background-position: -63px 10px; 
} 
.code-btn-img{ 
 background-image:url(../img/icon/codejt.png); 
 background-repeat: no-repeat; 
} 
.code-btn-img.active{ 
 background-position: -134px 10px; 
} 
.code-btn-img.error{ 
 background-position: 8px 10px; 
} 
.code-img-con{ 
 position: relative; 
} 
.code-mask{ 
 position: absolute; 
 top:0; 
 left: 0; 
 z-index: 10; 
} 
.code-tip{ 
 padding-left: 10px; 
 font-size: 12px; 
 color: #999; 
} 
.code-tip-red{ 
 color: red; 
} 
.code-tip-green{ 
 color: green; 
}