滑动图片验证码
HTML：
滑动拼图验证码
Css：
.container {
width: 310px;
margin: 100px auto;
}
input {
display: block;
width: 290px;
line-height: 40px;
margin: 10px 0;
padding: 0 10px;
outline: none;
border:1px solid #c8cccf;
border-radius: 4px;
color:#6a6f77;
}
#msg {
width: 100%;
line-height: 40px;
font-size: 14px;
text-align: center;
}
a:link,a:visited,a:hover,a:active {
margin-left: 100px;
color: #0366D6;
}
.block {
position: absolute;
left: 0;
top: 0;
}
.sliderContainer {
position: relative;
text-align: center;
width: 310px;
height: 40px;
line-height: 40px;
margin-top: 15px;
background: #f7f9fa;
color: #45494c;
border: 1px solid #e4e7eb;
}
.sliderContainer_active .slider {
height: 38px;
top: -1px;
border: 1px solid #1991FA;
}
.sliderContainer_active .sliderMask {
height: 38px;
border-width: 1px;
}
.sliderContainer_success .slider {
height: 38px;
top: -1px;
border: 1px solid #52CCBA;
background-color: #52CCBA !important;
}
.sliderContainer_success .sliderMask {
height: 38px;
border: 1px solid #52CCBA;
background-color: #D2F4EF;
}
.sliderContainer_success .sliderIcon {
background-position: 0 0 !important;
}
.sliderContainer_fail .slider {
height: 38px;
top: -1px;
border: 1px solid #f57a7a;
background-color: #f57a7a !important;
}
.sliderContainer_fail .sliderMask {
height: 38px;
border: 1px solid #f57a7a;
background-color: #fce1e1;
}
.sliderContainer_fail .sliderIcon {
background-position: 0 -83px !important;
}
.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;
}
.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;
}
.slider:hover {
background: #1991FA;
}
.slider:hover .sliderIcon {
background-position: 0 -13px;
}
.sliderIcon {
position: absolute;
top: 15px;
left: 13px;
width: 14px;
height: 10px;
background: url(http://cstaticdun.126.net//2.6.3/images/icon_light.f13cff3.png) 0 -26px;
background-size: 34px 471px;
}
.refreshIcon {
position: absolute;
right: 0;
top: 0;
width: 34px;
height: 34px;
cursor: pointer;
background: url(http://cstaticdun.126.net//2.6.3/images/icon_light.f13cff3.png) 0 -437px;
background-size: 34px 471px;
}
Js：
(function (window) {
const l = 42, // 滑块边长
r = 10, // 滑块半径
w = 310, // canvas宽度
h = 155, // canvas高度
PI = Math.PI;
const L = l + r * 2; // 滑块实际边长
function getRandomNumberByRange(start, end) {
return Math.round(Math.random() * (end - start) + start); //Math.round(x):与 x 最接近的整数
}
//创建画布
function createCanvas(width, height) {
const canvas = createElement('canvas');
canvas.width = width;
canvas.height = height;
return canvas;
}
//设置图片
function createImg(onload) {
const img = createElement('img');
img.crossOrigin = "Anonymous";
img.onload = onload; //图片加载完成执行函数
img.onerror = () => { //箭头函数相当于匿名函数
img.src = getRandomImg(); //随机选取一张图片地址
}
/*//可用箭头函数代替
img.onerror = function(){
img.src = getRandomImg(); //随机选取一张图片地址
}
*/
img.src = getRandomImg(); //随机选取一张图片地址
return img;
}
//创建标签
function createElement(tagName) {
return document.createElement(tagName);
}
//给指定标签添加样式
function addClass(tag, className) {
tag.classList.add(className);
}
//给指定标签移除样式
function removeClass(tag, className) {
tag.classList.remove(className);
}
//随机选取一张图片
function getRandomImg() {
return 'https://picsum.photos/300/150/?image=' + getRandomNumberByRange(0, 100);
}
//绘制裁剪画布区域
function draw(ctx, operation, x, y) {
ctx.beginPath();
ctx.moveTo(x, y);
ctx.lineTo(x + l / 2, y);
ctx.arc(x + l / 2, y - r + 2, r, 0, 2 * PI);
ctx.lineTo(x + l / 2, y);
ctx.lineTo(x + l, y);
ctx.lineTo(x + l, y + l / 2);
ctx.arc(x + l + r - 2, y + l / 2, r, 0, 2 * PI);
ctx.lineTo(x + l, y + l / 2);
ctx.lineTo(x + l, y + l);
ctx.lineTo(x, y + l);
ctx.lineTo(x, y);
ctx.fillStyle = '#fff';
ctx[operation]();
ctx.beginPath();
ctx.arc(x, y + l / 2, r, 1.5 * PI, 0.5 * PI);
ctx.globalCompositeOperation = "xor";
ctx.fill();
}
//返回相加数
function sum(x, y) {
return x + y;
}
//返回相乘数
function square(x) {
return x * x;
}
class jigsaw { //jigsaw：拼图
constructor(el, success, fail) { //constructor属性:返回对创建此对象的数组函数的引用;用于创建和初始化使用class创建的一个对象
this.el = el;
this.success = success;
this.fail = fail;
}
//初始化拼图执行函数
init() {
this.initDOM();
this.initImg();
this.draw();
this.bindEvents();
}
//初始化拼图对象函数
initDOM() {
const canvas = createCanvas(w, h); // 画布
const block = canvas.cloneNode(true); // 滑块
const sliderContainer = createElement('div');
const refreshIcon = createElement('div');
const sliderMask = createElement('div');
const slider = createElement('div');
const sliderIcon = createElement('span');
const text = createElement('span');
block.className = 'block';
sliderContainer.className = 'sliderContainer';
refreshIcon.className = 'refreshIcon';
sliderMask.className = 'sliderMask';
slider.className = 'slider';
sliderIcon.className = 'sliderIcon';
text.innerHTML = '向右滑动滑块填充拼图';
text.className = 'sliderText';
const el = this.el;
el.appendChild(canvas);
el.appendChild(refreshIcon);
el.appendChild(block);
slider.appendChild(sliderIcon);
sliderMask.appendChild(slider);
sliderContainer.appendChild(sliderMask);
sliderContainer.appendChild(text);
el.appendChild(sliderContainer);
/* //Object.assign()例子
var target = {a : 1}; //目标对象
var source1 = {b : 2}; //源对象1
var source2 = {c : 3}; //源对象2
var source3 = {c : 4}; //源对象3，和source2中的对象有同名属性c
Object.assign(target,source1,source2,source3);
//结果如下：
//{a:1,b:2,c:4}
*/
Object.assign(this, { //Object.assign是ES6新添加的接口，主要的用途是用来合并多个JavaScript的对象
canvas,
block,
sliderContainer,
refreshIcon,
slider,
sliderMask,
sliderIcon,
text,
canvasCtx: canvas.getContext('2d'),
blockCtx: block.getContext('2d')
})
}
//初始化拼图图片函数
initImg() {
const img = createImg(() => {
//设置截取画布
this.canvasCtx.drawImage(img, 0, 0, w, h);
this.blockCtx.drawImage(img, 0, 0, w, h);
const y = this.y - r * 2 + 2;
const ImageData = this.blockCtx.getImageData(this.x, y, L, L);
this.block.width = L;
this.blockCtx.putImageData(ImageData, 0, y);
})
this.img = img;
}
//拼图滑块函数
draw() {
// 随机创建滑块的位置
this.x = getRandomNumberByRange(L + 10, w - (L + 10));
this.y = getRandomNumberByRange(10 + r * 2, h - (L + 10));
draw(this.canvasCtx, 'fill', this.x, this.y);
draw(this.blockCtx, 'clip', this.x, this.y);
}
//选中拼图块函数
clean() {
this.canvasCtx.clearRect(0, 0, w, h); //clearRect() 方法清空给定矩形内的指定像素
this.blockCtx.clearRect(0, 0, w, h);
this.block.width = w;
}
//事件绑定
bindEvents() {
this.el.onselectstart = () => false
this.refreshIcon.onclick = () => {
this.reset();
}
let originX, originY, trail = [], isMouseDown = false;
this.slider.addEventListener('mousedown', function (e) {
originX = e.x, originY = e.y;
isMouseDown = true;
})
document.addEventListener('mousemove', (e) => {
if (!isMouseDown) return false;
const moveX = e.x - originX;
const moveY = e.y - originY;
if (moveX < 0 || moveX + 38 >= w) return false;
this.slider.style.left = moveX + 'px';
var blockLeft = (w - 40 - 20) / (w - 40) * moveX;
this.block.style.left = blockLeft + 'px';
addClass(this.sliderContainer, 'sliderContainer_active');
this.sliderMask.style.width = moveX + 'px';
trail.push(moveY);
})
document.addEventListener('mouseup', (e) => {
if (!isMouseDown) return false;
isMouseDown = false;
if (e.x == originX) return false;
removeClass(this.sliderContainer, 'sliderContainer_active');
this.trail = trail;
const {spliced, TuringTest} = this.verify();
if (spliced) {
if (TuringTest) {
addClass(this.sliderContainer, 'sliderContainer_success');
this.success && this.success();
} else {
addClass(this.sliderContainer, 'sliderContainer_fail')
this.text.innerHTML = '再试一次';
this.reset();
}
} else {
addClass(this.sliderContainer, 'sliderContainer_fail')
this.fail && this.fail()
setTimeout(() => {
this.reset()
}, 1000)
}
})
}
//验证
verify() {
const arr = this.trail; // 拖动时y轴的移动距离
const average = arr.reduce(sum) / arr.length; // 平均值
const deviations = arr.map(x => x - average); // 偏差数组
const stddev = Math.sqrt(deviations.map(square).reduce(sum) / arr.length); // 标准差
const left = parseInt(this.block.style.left);
return {
spliced: Math.abs(left - this.x) < 10,
TuringTest: average !== stddev, // 只是简单的验证拖动轨迹，相等时一般为0，表示可能非人为操作
}
}
//重置
reset() {
this.sliderContainer.className = 'sliderContainer';
this.slider.style.left = 0; //滑块重置
this.block.style.left = 0; //裁剪区重置
this.sliderMask.style.width = 0;
this.clean();
this.img.src = getRandomImg();
this.draw();
}
}
window.jigsaw = {
init: function (element, success, fail) {
new jigsaw(element, success, fail).init();
}
}
}(window))