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html+jQuery实现拖动滑块图片拼图验证码插件【移动端适用】

程序员文章站 2022-05-25 10:54:22
电脑和手机移动端都适用的jquery拖动滑块图片拼图验证码插件，通过鼠标拖动或触屏滑动填充拼图来进行安全验证，点击刷新可以更换当前待验证的图片。 html & css：...

电脑和手机移动端都适用的jquery拖动滑块图片拼图验证码插件，通过鼠标拖动或触屏滑动填充拼图来进行安全验证，点击刷新可以更换当前待验证的图片。

html & css：

<!doctype html>
<html lang="zh">
<head>
<meta charset="utf-8">
<meta http-equiv="x-ua-compatible" content="ie=edge,chrome=1">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>拖动滑块图片拼图验证码插件</title>
<!--框架样式-->
<link href="css/bootstrap.min.css" rel="external nofollow" rel="stylesheet">
<!--图标样式-->
<link href="https://cdn.bootcss.com/font-awesome/5.7.2/css/all.min.css" rel="stylesheet">
<!--主要样式-->
<link href="disk/slidercaptcha.css" rel="external nofollow" rel="stylesheet" />
<style>
.slidercaptcha {
 margin: 0 auto;
 width: 314px;
 height: 286px;
 border-radius: 4px;
 box-shadow: 0 0 10px rgba(0, 0, 0, 0.125);
 margin-top: 40px;
}
.slidercaptcha .card-body {
 padding: 1rem;
}
.slidercaptcha canvas:first-child {
 border-radius: 4px;
 border: 1px solid #e6e8eb;
}
.slidercaptcha.card .card-header {
 background-image: none;
 background-color: rgba(0, 0, 0, 0.03);
}
.refreshicon {
 top: -54px;
}
</style>
</head>
<body>
<div class="container-fluid">
 <div class="form-row">
 <div class="col-12">
 <div class="slidercaptcha card">
 <div class="card-header">
  <span>请完成安全验证</span>
 </div>
 <div class="card-body"><div id="captcha"></div></div>
 </div>
 </div>
 </div>
</div>
<script src="js/jquery-1.11.0.min.js" type="text/javascript"></script>
<script src="disk/longbow.slidercaptcha.js"></script>
<script>
 $('#captcha').slidercaptcha({
 repeaticon: 'fa fa-redo',
 setsrc: function () {
 return 'http://images.sdgxgz.com/pic' + math.round(math.random() * 136) + '.jpg';
 },
 onsuccess: function () {
 alert('验证通过!');
 }
 });
</script>
</body>
</html>
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 ? '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 + '/?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) < this.options.offset,
   verified: stddev !== 0, // 简单验证下拖动轨迹，为零时表示y轴上下没有波动，可能非人为操作
  }
 };
 _proto.reset = function () {
  this.slidercontainer.removeclass('slidercontainer_fail slidercontainer_success');
  this.slider.style.left = 0
  this.block.style.left = 0
  this.slidermask.style.width = 0
  this.clean()
  this.text.attr('data-text', this.text.text());
  this.text.text(this.options.loadingtext);
  this.img.setsrc();
 };
})(jquery);

附录1：需要注意css和js的引用路径；

总结

以上所述是小编给大家介绍的html+jquery实现拖动滑块图片拼图验证码插件希望对大家有所帮助

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