html+jQuery实现拖动滑块图片拼图验证码插件【移动端适用】

 

 

 

 

  请完成安全验证
 
 

 
 
 






disk/slidercaptcha.css：
body {
 overflow-x: hidden;
}
.block {
 position: absolute;
 left: 0;
 top: 0;
}
.sliderContainer {
 position: relative;
 text-align: center;
 line-height: 40px;
 background: #f7f9fa;
 color: #45494c;
 border-radius: 2px;
}
.sliderbg {
 position: absolute;
 left: 0;
 right: 0;
 top: 0;
 background-color: #f7f9fa;
 height: 40px;
 border-radius: 2px;
 border: 1px solid #e6e8eb;
}
.sliderContainer_active .slider {
 top: -1px;
 border: 1px solid #1991FA;
}
.sliderContainer_active .sliderMask {
 border-width: 1px 0 1px 1px;
}
.sliderContainer_success .slider {
 top: -1px;
 border: 1px solid #52CCBA;
 background-color: #52CCBA !important;
}
.sliderContainer_success .sliderMask {
 border: 1px solid #52CCBA;
 border-width: 1px 0 1px 1px;
 background-color: #D2F4EF;
}
.sliderContainer_success .sliderIcon:before {
 content: "\f00c";
}
.sliderContainer_fail .slider {
 top: -1px;
 border: 1px solid #f57a7a;
 background-color: #f57a7a !important;
}
.sliderContainer_fail .sliderMask {
 border: 1px solid #f57a7a;
 background-color: #fce1e1;
 border-width: 1px 0 1px 1px;
}
.sliderContainer_fail .sliderIcon:before {
 content: "\f00d";
}
.sliderContainer_active .sliderText, .sliderContainer_success .sliderText, .sliderContainer_fail .sliderText {
 display: none;
}
.sliderMask {
 position: absolute;
 left: 0;
 top: 0;
 height: 40px;
 border: 0 solid #1991FA;
 background: #D1E9FE;
 border-radius: 2px;
}
.slider {
 position: absolute;
 top: 0;
 left: 0;
 width: 40px;
 height: 40px;
 background: #fff;
 box-shadow: 0 0 3px rgba(0, 0, 0, 0.3);
 cursor: pointer;
 transition: background .2s linear;
 border-radius: 2px;
 display: flex;
 align-items: center;
 justify-content: center;
}
.slider:hover {
 background: #1991FA;
}
.slider:hover .sliderIcon {
 background-position: 0 -13px;
}
.sliderText {
 position: relative;
}
.sliderIcon {
}
.refreshIcon {
 position: absolute;
 right: 0;
 top: 0;
 cursor: pointer;
 margin: 6px;
 color: rgba(0,0,0,.25);
 font-size: 1rem;
 z-index: 5;
 transition: color .3s linear;
}
 .refreshIcon:hover {
 color: #6c757d;
 }
disk/longbow.slidercaptcha.js：
(function ($) {
 'use strict';
 var SliderCaptcha = function (element, options) {
  this.$element = $(element);
  this.optiOns= $.extend({}, SliderCaptcha.DEFAULTS, options);
  this.$element.css({ 'position': 'relative', 'width': this.options.width + 'px', 'margin': '0 auto' });
  this.init();
 };
 SliderCaptcha.VERSION = '1.0';
 SliderCaptcha.Author = 'argo@163.com';
 SliderCaptcha.DEFAULTS = {
  width: 280,  // canvas宽度
  height: 155, // canvas高度
  PI: Math.PI,
  sliderL: 42, // 滑块边长
  sliderR: 9,  // 滑块半径
  offset: 5,  // 容错偏差
  loadingText: '正在加载中...',
  failedText: '再试一次',
  barText: '向右滑动填充拼图',
  repeatIcon: 'fa fa-repeat',
  maxLoadCount: 3,
  localImages: function () {
   return 'images/Pic' + Math.round(Math.random() * 4) + '.jpg';
  }
 };
 function Plugin(option) {
  return this.each(function () {
   var $this = $(this);
   var data = $this.data('lgb.SliderCaptcha');
   var optiOns= typeof option === 'object' && option;
   if (data && !/reset/.test(option)) return;
   if (!data) $this.data('lgb.SliderCaptcha', data = new SliderCaptcha(this, options));
   if (typeof option === 'string') data[option]();
  });
 }
 $.fn.sliderCaptcha = Plugin;
 $.fn.sliderCaptcha.COnstructor= SliderCaptcha;
 var _proto = SliderCaptcha.prototype;
 _proto.init = function () {
  this.initDOM();
  this.initImg();
  this.bindEvents();
 };
 _proto.initDOM = function () {
  var createElement = function (tagName, className) {
   var elment = document.createElement(tagName);
   elment.className = className;
   return elment;
  };
  var createCanvas = function (width, height) {
   var canvas = document.createElement('canvas');
   canvas.width = width;
   canvas.height = height;
   return canvas;
  };
  var canvas = createCanvas(this.options.width - 2, this.options.height) // 画布
  var block = canvas.cloneNode(true) // 滑块
  var sliderCOntainer= createElement('div', 'sliderContainer');
  var refreshIcon = createElement('i', 'refreshIcon ' + this.options.repeatIcon);
  var sliderMask = createElement('div', 'sliderMask');
  var sliderbg = createElement('div', 'sliderbg');
  var slider = createElement('div', 'slider');
  var sliderIcon = createElement('i', 'fa fa-arrow-right sliderIcon');
  var text = createElement('span', 'sliderText');
  block.className = 'block'
  text.innerHTML = this.options.barText;
  var el = this.$element;
  el.append($(canvas));
  el.append($(refreshIcon));
  el.append($(block));
  slider.appendChild(sliderIcon);
  sliderMask.appendChild(slider);
  sliderContainer.appendChild(sliderbg);
  sliderContainer.appendChild(sliderMask);
  sliderContainer.appendChild(text);
  el.append($(sliderContainer));
  Object.assign(this, {
   canvas,
   block,
   sliderContainer: $(sliderContainer),
   refreshIcon,
   slider,
   sliderMask,
   sliderIcon,
   text: $(text),
   canvasCtx: canvas.getContext('2d'),
   blockCtx: block.getContext('2d')
  })
 };
 _proto.initImg = function () {
  var that = this;
  var isIE = window.navigator.userAgent.indexOf('Trident') > -1;
  var L = this.options.sliderL + this.options.sliderR * 2 + 3; // 滑块实际边长
  var drawImg = function (ctx, operation) {
   var l = that.options.sliderL;
   var r = that.options.sliderR;
   var PI = that.options.PI;
   var x = that.x;
   var y = that.y;
   ctx.beginPath()
   ctx.moveTo(x, y)
   ctx.arc(x + l / 2, y - r + 2, r, 0.72 * PI, 2.26 * PI)
   ctx.lineTo(x + l, y)
   ctx.arc(x + l + r - 2, y + l / 2, r, 1.21 * PI, 2.78 * PI)
   ctx.lineTo(x + l, y + l)
   ctx.lineTo(x, y + l)
   ctx.arc(x + r - 2, y + l / 2, r + 0.4, 2.76 * PI, 1.24 * PI, true)
   ctx.lineTo(x, y)
   ctx.lineWidth = 2
   ctx.fillStyle = 'rgba(255, 255, 255, 0.7)'
   ctx.strokeStyle = 'rgba(255, 255, 255, 0.7)'
   ctx.stroke()
   ctx[operation]()
   ctx.globalCompositeOperation = isIE &＃63; 'xor' : 'overlay'
  }
  var getRandomNumberByRange = function (start, end) {
   return Math.round(Math.random() * (end - start) + start);
  };
  var img = new Image();
  img.crossOrigin = "Anonymous";
  var loadCount = 0;
  img.Onload= function () {
   // 随机创建滑块的位置
   that.x = getRandomNumberByRange(L + 10, that.options.width - (L + 10));
   that.y = getRandomNumberByRange(10 + that.options.sliderR * 2, that.options.height - (L + 10));
   drawImg(that.canvasCtx, 'fill');
   drawImg(that.blockCtx, 'clip');
   that.canvasCtx.drawImage(img, 0, 0, that.options.width - 2, that.options.height);
   that.blockCtx.drawImage(img, 0, 0, that.options.width - 2, that.options.height);
   var y = that.y - that.options.sliderR * 2 - 1;
   var ImageData = that.blockCtx.getImageData(that.x - 3, y, L, L);
   that.block.width = L;
   that.blockCtx.putImageData(ImageData, 0, y);
   that.text.text(that.text.attr('data-text'));
  };
  img.Onerror= function () {
   loadCount++;
   if (window.location.protocol === 'file:') {
    loadCount = that.options.maxLoadCount;
    console.error("can't load pic resource file from File protocal. Please try http or https");
   }
   if (loadCount >= that.options.maxLoadCount) {
    that.text.text('加载失败').addClass('text-danger');
    return;
   }
   img.src = that.options.localImages();
  };
  img.setSrc = function () {
   var src = '';
   loadCount = 0;
   that.text.removeClass('text-danger');
   if ($.isFunction(that.options.setSrc)) src = that.options.setSrc();
   if (!src || src === '') src = 'https://picsum.photos/' + that.options.width + '/' + that.options.height + '/&＃63;image=' + Math.round(Math.random() * 20);
   if (isIE) { // IE浏览器无法通过img.crossOrigin跨域，使用ajax获取图片blob然后转为dataURL显示
    var xhr = new XMLHttpRequest()
    xhr.Onloadend= function (e) {
     var file = new FileReader(); // FileReader仅支持IE10+
     file.readAsDataURL(e.target.response);
     file.Onloadend= function (e) {
      img.src = e.target.result;
     }
    }
    xhr.open('GET', src);
    xhr.respOnseType= 'blob';
    xhr.send();
   } else img.src = src;
  };
  img.setSrc();
  this.text.attr('data-text', this.options.barText);
  this.text.text(this.options.loadingText);
  this.img = img
 };
 _proto.clean = function () {
  this.canvasCtx.clearRect(0, 0, this.options.width, this.options.height);
  this.blockCtx.clearRect(0, 0, this.options.width, this.options.height);
  this.block.width = this.options.width;
 };
 _proto.bindEvents = function () {
  var that = this;
  this.$element.on('selectstart', function () {
   return false;
  });
  $(this.refreshIcon).on('click', function () {
   that.text.text(that.options.barText);
   that.reset();
   if ($.isFunction(that.options.onRefresh)) that.options.onRefresh.call(that.$element);
  });
  var originX, originY, trail = [],
   isMouseDown = false
  var handleDragStart = function (e) {
   if (that.text.hasClass('text-danger')) return;
   originX = e.clientX || e.touches[0].clientX;
   originY = e.clientY || e.touches[0].clientY;
   isMouseDown = true;
  };
  var handleDragMove = function (e) {
   if (!isMouseDown) return false;
   var eventX = e.clientX || e.touches[0].clientX;
   var eventY = e.clientY || e.touches[0].clientY;
   var moveX = eventX - originX;
   var moveY = eventY - originY;
   if (moveX <0 || moveX + 40 > that.options.width) return false;
   that.slider.style.left = (moveX - 1) + 'px';
   var blockLeft = (that.options.width - 40 - 20) / (that.options.width - 40) * moveX;
   that.block.style.left = blockLeft + 'px';
   that.sliderContainer.addClass('sliderContainer_active');
   that.sliderMask.style.width = (moveX + 4) + 'px';
   trail.push(moveY);
  };
  var handleDragEnd = function (e) {
   if (!isMouseDown) return false
   isMouseDown = false
   var eventX = e.clientX || e.changedTouches[0].clientX
   if (eventX == originX) return false
   that.sliderContainer.removeClass('sliderContainer_active');
   that.trail = trail
   var {
    spliced,
    verified
   } = that.verify()
   if (spliced && verified) {
    that.sliderContainer.addClass('sliderContainer_success');
    if ($.isFunction(that.options.onSuccess)) that.options.onSuccess.call(that.$element);
   } else {
    that.sliderContainer.addClass('sliderContainer_fail');
    if ($.isFunction(that.options.onFail)) that.options.onFail.call(that.$element);
    setTimeout(() => {
     that.text.text(that.options.failedText);
     that.reset();
    }, 1000);
   }
  };
  this.slider.addEventListener('mousedown', handleDragStart);
  this.slider.addEventListener('touchstart', handleDragStart);
  document.addEventListener('mousemove', handleDragMove);
  document.addEventListener('touchmove', handleDragMove);
  document.addEventListener('mouseup', handleDragEnd);
  document.addEventListener('touchend', handleDragEnd);
  document.addEventListener('mousedown', function () { return false; });
  document.addEventListener('touchstart', function () { return false; });
 };
 _proto.verify = function () {
  var sum = function (x, y) { return x + y; };
  var square = function (x) { return x * x; };
  var arr = this.trail // 拖动时y轴的移动距离
  var average = arr.reduce(sum) / arr.length;
  var deviatiOns= arr.map(function (x) { return x - average; });
  var stddev = Math.sqrt(deviations.map(square).reduce(sum) / arr.length);
  var left = parseInt(this.block.style.left);
  return {
   spliced: Math.abs(left - this.x)