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：
拖动滑块图片拼图验证码插件
.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;
}
请完成安全验证
$('#captcha').sliderCaptcha({
repeatIcon: 'fa fa-redo',
setSrc: function () {
return '/Pic' + Math.round(Math.random() * 136) + '.jpg';
},
onSuccess: function () {
alert('验证通过!');
}
});
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@';
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
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