js 拖动滑块验证

 备注：拖动滑块时尽量平移，chrome浏览器上没有卡顿情况，但是搜狗极速模式和360极速模式都遇到了卡顿，拖不动情况，应是浏览器内部对事件响应速度导致吧。

JS代码：

;(function ($,window,document,undefined) {
    function SliderUnlock(elm, options, success){
        var me = this;
        var $elm = me.checkElm(elm) ? $(elm) : $;
        success = me.checkFn(success) ? success : function(){};

        var opts = {
            successLabelTip: "验证成功！",
            defaultLabelTip: "拖动滑块验证！",
            duration:  200,
            swipestart:  false,
            min:  0,
            max:  $elm.width(),
            index:  0,
            IsOk:  false,
            lableIndex: 0
        };

        opts = $.extend(opts, options||{});
        
        //$elm
        me.elm = $elm;
        //opts
        me.opts = opts;
        //是否鼠标移入状态
        me.isIn = false;
        //鼠标移出次数，防抖
        me.outNum = 0;
        //是否开始滑动
        me.swipestart = opts.swipestart;
        //最小值
        me.min = opts.min;
        //最大值
        me.max = opts.max;
        //当前滑动条所处的位置
        me.index = opts.index;
        //是否滑动成功
        me.isOk = opts.isOk;
        //滑块宽度
        me.labelWidth = me.elm.find('#label').width();
        //滑块背景
        me.sliderBg = me.elm.find('#slider_bg');
        //鼠标在滑动按钮的位置
        me.lableIndex = opts.lableIndex;
        //success
        me.success = success;
    }

    SliderUnlock.prototype.init = function () {
        var me = this;
        me.elm.find("#label").on("mousedown", function (event) {
            var e = event || window.event;
            me.lableIndex = e.clientX - this.offsetLeft;
            me.handerIn();
        }).on("mousemove", function (event) {
            me.handerMove(event);
        }).on("mouseup", function (event) {
            me.handerOut();
        }).on("mouseout", function (event) {
            me.handerOut();
        }).on("touchstart", function (event) {
            var e = event || window.event;
            me.lableIndex = e.originalEvent.touches[0].pageX - this.offsetLeft;
            me.handerIn();
        }).on("touchmove", function (event) {
            me.handerMove(event, "mobile");
        }).on("touchend", function (event) {
            me.handerOut();
        });
        me.updateView();
    };

    /**
     * 鼠标/手指接触滑动按钮
     */
    SliderUnlock.prototype.handerIn = function () {
        var me = this;
        if (me.isIn)
            return;
        me.swipestart = true;
        me.outNum = 0;
        me.min = 0;
        me.max = me.elm.width();
        me.isIn = true;
    };

    /**
     * 鼠标/手指移出
     */
    SliderUnlock.prototype.handerOut = function () {
       
        var me = this;
        if (!me.isIn)
            return;
        me.outNum = me.outNum + 1;
        if (me.outNum == 2)
        {
            me.outNum = 0;
            me.isIn = false;
            //停止
            me.swipestart = false;
            //me.move();
            if (me.index < me.max) {
                me.reset();
            }
        }
    };

    /**
     * 鼠标/手指移动
     * @param event
     * @param type
     */
    SliderUnlock.prototype.handerMove = function (event, type) {
        var me = this;
        if (me.swipestart) {
            event.preventDefault();
            event = event || window.event;
            if (type == "mobile") {
                me.index = event.originalEvent.touches[0].pageX - me.lableIndex;
            } else {
                me.index = event.clientX - me.lableIndex;
            }
            me.move();
        }
    };

    /**
     * 鼠标/手指移动过程
     */
    SliderUnlock.prototype.move = function () {
        var me = this;
        if ((me.index + me.labelWidth) >= me.max) {
            me.index = me.max - me.labelWidth - 2;
            //停止
            me.swipestart = false;
            //解锁
            me.isOk = true;
        }
        if (me.index < 0) {
            me.index = me.min;
            //未解锁
            me.isOk = false;
        }
        if (me.index + me.labelWidth + 2 == me.max && me.max > 0 && me.isOk) {
            console.log("me.index + me.labelWidth + 2 == me.max && me.max > 0 && me.isOk");
            //解锁默认操作
            $('#label').unbind().next('#labelTip').
            text(me.opts.successLabelTip).css({ 'color': '#fff' });
            me.success();
        }
        me.updateView();
    };


    /**
     * 更新视图
     */
    SliderUnlock.prototype.updateView = function () {
        var me = this;
        me.sliderBg.css('width', me.index);
        me.elm.find("#label").css("left", me.index + "px")
    };

    /**
    * 是否验证通过
    */
    SliderUnlock.prototype.isValidateOk = function () {
        var me = this;
        return me.isOk;
    };

    /**
     * 重置slide的起点
     */
    SliderUnlock.prototype.reset = function () {
        var me = this;
        me.isOk = false;
        me.index = 0;
        me.sliderBg.animate({ 'width': 0 }, me.opts.duration);
        me.elm.find("#label").on("mousedown", function (event) {
            var e = event || window.event;
            me.lableIndex = e.clientX - this.offsetLeft;
            me.handerIn();
        }).on("mousemove", function (event) {
            me.handerMove(event);
        }).on("mouseup", function (event) {
            me.handerOut();
        }).on("mouseout", function (event) {
            me.handerOut();
        }).on("touchstart", function (event) {
            var e = event || window.event;
            me.lableIndex = e.originalEvent.touches[0].pageX - this.offsetLeft;
            me.handerIn();
        }).on("touchmove", function (event) {
            me.handerMove(event, "mobile");
        }).on("touchend", function (event) {
            me.handerOut();
        }).animate({ left: me.index }, me.opts.duration)
            .next("#labelTip").text(me.opts.defaultLabelTip).css({ 'color': '#787878' })
            .animate({ opacity: 1 }, me.opts.duration);
        me.updateView();
    };

    /**
     * 检测元素是否存在
     * @param elm
     * @returns {boolean}
     */
    SliderUnlock.prototype.checkElm = function (elm) {
        if($(elm).length > 0){
            return true;
        }else{
            throw "this element does not exist.";
        }
    };

    /**
     * 检测传入参数是否是function
     * @param fn
     * @returns {boolean}
     */
    SliderUnlock.prototype.checkFn = function (fn) {
        if(typeof fn === "function"){
            return true;
        } else {
            return false;
            //throw "the param is not a function.";
        }
    };

    window['SliderUnlock'] = SliderUnlock;
})(jQuery, window, document);

Css样式：

#slider {
  margin: 10px auto;
  width: 200px;
  height: 30px;
  position: relative;
  border-radius:5px;
  background-color: #dae2d0;
  overflow: hidden;
  text-align: center;
  user-select: none;
  -moz-user-select: none;
  -webkit-user-select: none;
}

#slider_bg {
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  background-color: #49ba43;
  z-index: 1;
}

#label {
  width: 46px;
  position: absolute;
  left: 0;
  top: 0;
  height: 29px;
  line-height: 29px;
  border-radius:5px;
  border: 1px solid #cccccc;
  background: #fff;
  z-index: 3;
  cursor: move;
  color: #ff9e77;
  font-size: 18px;
  font-weight: 900;
}

#labelTip {
  position: absolute;
  left: 0;
  width: 100%;
  height: 100%;
  font-size: 13px;
  font-family: 'Microsoft Yahei', serif;
  color: #787878;
  line-height: 30px;
  text-align: center;
  z-index: 2;
}

前台调用：

<!--HTML-->
<div id="slider">
    <div id="slider_bg"></div>
    <span id="label">>></span>
    <span id="labelTip">
        拖动滑块验证
    </span>
</div>

//JS初始化
var slider;
$(function () {
    slider = new SliderUnlock("#slider");
    slider.init();
});

//重置
 slider.reset();

说实话，如上代码，还是会出现卡顿，近期尝试了如下：

<!DOCTYPE html>
<html>
<head>
   <meta charset="utf-8">
   <meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate">
   <meta http-equiv="Pragma" content="no-cache">
   <meta http-equiv="Expires" content="0">
   <meta http-equiv="X-UA-Compatible" content="IE-Edge,chrome=1">
   <meta name="viewport" content="width=device-width,initial-scale=1,maximum-scale=1,minimum-scale=1,user-scalable=no">
   <meta content="yes" name="apple-mobile-web-app-capable">
   <meta content="black" name="apple-mobile-web-app-status-bar-style"> 
   <meta content="telephone=no" name="format-detection">  
   <meta content="email=no" name="format-detection"> 
   <title>拖动滑块验证</title>
   <meta name="description" content="">
   <meta name="keywords" content="">
   <link rel="stylesheet" type="text/css" href="">
   <style>
    *{ margin:0; padding:0; }
        body{ font:12px/1.125 Microsoft YaHei; background:#fff; }
        ul, li{ list-style:none; }
        a{ text-decoration:none; }
        .ani{transition:all .3s;}
        .wrap{ width:300px; height:350px; text-align:center; margin:150px auto;}
        .inner{ padding:15px; }
        .clearfix{ overflow:hidden; _zoom:1; }
        .none{ display:none; }
        #slider{position:relative;background-color:#e8e8e8;width:300px;height:34px;line-height:34px;text-align:center;}
        #slider .handler{position:absolute;top:0px;left:0px;width:40px;height:32px;border:1px solid #ccc;cursor:move;}
        .handler_bg{background:#fff url("data:image/png;base64,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") no-repeat center;}
        .handler_ok_bg{background:#fff url("data:image/png;base64,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") no-repeat center;}
        #slider .drag_bg{background-color:#7ac23c;height:34px;width:0px;}
        #slider .drag_text{position:absolute;top:0px;width:300px;-moz-user-select:none;-webkit-user-select:none;user-select:none;-o-user-select:none;-ms-user-select:none;}
        .unselect{-moz-user-select:none;-webkit-user-select:none;-ms-user-select:none;}
        .slide_ok{color:#fff;}
   </style>
</head>
<body>
    
    <div class="wrap">
        <div id="slider">
            <div class="drag_bg"></div>
            <div class="drag_text" onselectstart="return false;" unselectable="on">拖动滑块验证</div>
            <div class="handler handler_bg"></div>
        </div>
    </div>
    

   
    <script>
    (function(window,document,undefined){
       var dog = {//声明一个命名空间，或者称为对象
           $:function(id){
              return document.querySelector(id);
           },
           on:function(el,type,handler){
              el.addEventListener(type,handler,false);
           },
           off:function(el,type,handler){
              el.removeEventListener(type,handler,false);
           }
       };  
       //封装一个滑块类
       function Slider(){
          var args = arguments[0];
          for(var i in args){
              this[i] = args[i];  //一种快捷的初始化配置
          }
          //直接进行函数初始化，表示生成实例对象就会执行初始化
          this.init();
       }
       Slider.prototype = {
          constructor:Slider,
          init:function(){
             this.getDom();
             this.dragBar(this.handler);
          },
          getDom:function(){
             this.slider = dog.$('#'+this.id);
             this.handler = dog.$('.handler');
             this.bg = dog.$('.drag_bg');
          },
          dragBar:function(handler){
             var that = this,
                 startX = 0,
                 lastX = 0,
                 doc = document,
                 width = this.slider.offsetWidth,
                 max = width - handler.offsetWidth,
                 drag = {
                    down:function(e){
                       var e = e||window.event;
                       that.slider.classList.add('unselect');
                       startX = e.clientX - handler.offsetLeft;
                       console.log('startX: '+startX+' px');
                       dog.on(doc,'mousemove',drag.move);
                       dog.on(doc,'mouseup',drag.up);
                       return false;
                    },
                    move:function(e){
                       var e = e||window.event;
                       lastX = e.clientX - startX;
                       lastX = Math.max(0,Math.min(max,lastX)); //这一步表示距离大于0小于max，巧妙写法
                       console.log('lastX: '+lastX+' px');
                       if(lastX>=max){
                          handler.classList.add('handler_ok_bg');
                          that.slider.classList.add('slide_ok');
                          dog.off(handler,'mousedown',drag.down);
                          drag.up();
                       }
                       that.bg.style.width = lastX + 'px';
                       handler.style.left = lastX + 'px';

                    },
                    up:function(e){
                       var e = e||window.event;
                       that.slider.classList.remove('unselect');
                       if(lastX < width){                         
                          that.bg.classList.add('ani');
                          handler.classList.add('ani');
                          that.bg.style.width = 0;
                          handler.style.left = 0;
                          setTimeout(function(){
                            that.bg.classList.remove('ani');
                            handler.classList.remove('ani');
                          },300);

                       }
                       dog.off(doc,'mousemove',drag.move);
                       dog.off(doc,'mouseup',drag.up);
                    }
                 };

             dog.on(handler,'mousedown',drag.down);
          }
       };

       window.S = window.Slider = Slider;
       
       

    })(window,document);
    
    var defaults = {
       id:'slider'
    };
    new S(defaults);
    </script>
</body>
</html>

附：拖动轮播图片：http://www.jssor.com/demos/image-slider.slider