php 滑动验证码

自己研究： jQuery拖拽滑动验证码插件 slideunlock.js

原理：（别人说）

响应时间，拖拽速度，时间，位置，轨迹，重试次数等。
这些因素能够构成一个采样结果或者辨识特性。

只获取到滑动时间，滑动的长度。

效果：

html页面

<link href="css/slide-unlock.css" rel="stylesheet">
<script type="text/javascript" src="js/jquery-2.0.2.min.js"></script>

<div id="slider">

<div
id="slider_bg"></div>

<span
id="label">>></span> <span
id="labelTip">拖动滑块验证</span>

</div>

<script>

var startTime =
0;

var
endTime = 0;

var
numTime = 0;

$(function
() {

var slider = new
SliderUnlock("#slider",{

successLabelTip : "欢迎注册"

},function(){

var  sli_width =
$("#slider_bg").width();

alert("验证成功");

endTime = nowTime();

numTime = endTime-startTime;

endTime = 0;

startTime = 0;

//
获取到滑动使用的时间
滑动的宽度

alert( numTime );

alert( sli_width );

});

slider.init();

})

/**

* 获取时间精确到毫秒

* @type

*/

function nowTime(){

var myDate = new
Date();

var H =
myDate.getHours();//获取小时

var M =
myDate.getMinutes(); //获取分钟

var S =
myDate.getSeconds();//获取秒

var MS =
myDate.getMilliseconds();//获取毫秒

var milliSeconds
= H * 3600 * 1000 + M * 60 * 1000 + S * 1000 + MS;

return
milliSeconds;

}

</script>

<script
src="js/jquery.slideunlock.js"></script>

css样式

#slider {
  margin: 10px 5%;
  width: 90%;
  height: 40px;
  position: relative;
  border-radius: 8px;
  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: #7AC23C;
  z-index: 1;
}

#label {
  width: 46px;
  position: absolute;
  left: 0;
  top: 0;
  height: 38px;
  line-height: 38px;
  border: 1px solid #cccccc;
  background: #fff;
  z-index: 3;
  cursor: move;
  color: #ff9e77;
  font-size: 16px;
  font-weight: 900;
}

#labelTip {
  position: absolute;
  left: 0;
  width: 100%;
  height: 100%;
  font-size: 13px;
  font-family: 'Microsoft Yahei', serif;
  color: #787878;
  line-height: 38px;
  text-align: center;
  z-index: 2;
}

js效果

/**
 * jquery plugin -- jquery.slideunlock.js
 * www.sucaijiayuan.com
 * created: March 27, 2016
 */

;(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:  "Successfully Verified",
            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.updateView();
        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();
        });
    };

    /**
     * 鼠标/手指接触滑动按钮
     */
    SliderUnlock.prototype.handerIn = function () {
        var me = this;
        me.swipestart = true;

        var myDate = new Date();
        var H = myDate.getHours();//获取小时
        var M = myDate.getMinutes(); //获取分钟
        var S = myDate.getSeconds();//获取秒
        var MS = myDate.getMilliseconds();//获取毫秒
        var milliSeconds = H * 3600 * 1000 + M * 60 * 1000 + S * 1000 + MS;

        startTime = milliSeconds;

        me.min = 0;
        me.max = me.elm.width();
    };

    /**
     * 鼠标/手指移出
     */
    SliderUnlock.prototype.handerOut = function () {
        var me = this;
        //停止
        me.swipestart = false;

        weizhi = me.labelWidth;

        //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) {
            //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")
    };

    /**
     * 重置slide的起点
     */
    SliderUnlock.prototype.reset = function () {
        var me = this;

        startTime = 0;

        me.index = 0;
        me.sliderBg .animate({'width':0},me.opts.duration);
        me.elm.find("#label").animate({left: me.index}, me.opts.duration)
            .next("#lableTip").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{
            throw "the param is not a function.";
        }
    };

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

两个链接

https://www.zhihu.com/question/32209043/answer/55252171

http://www.zhihu.com/question/35538123