相信大家都玩过B站，B站在登陆的时候有个拼图滑动验证，今天就整合一下前端实现的滑动验证
拖动滑动验证（无背景图片）
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>拖动滑块验证</title>
</head>
<body>
<meta charset="utf8">
<style>
/* 滑动控件容器,灰色背景 */
#dragContainer {
position: relative;
display: inline-block;
background: #e8e8e8;
width: 300px;
height: 33px;
border: 2px solid #e8e8e8;
}
/* 滑块左边部分,绿色背景 */
#dragBg {
position: absolute;
background-color: #7ac23c;
width: 0px;
height: 100%;
}
/* 滑动验证容器文本 */
#dragText {
position: absolute;
width: 100%;
height: 100%;
/* 文字水平居中 */
text-align: center;
/* 文字垂直居中,这里不能用百分比,因为百分比是相对原始line-height的,而非div高度 */
line-height: 33px;
/* 文本不允许选中 */
user-select: none;
-webkit-user-select: none;
}
/* 滑块 */
#dragHandler {
position: absolute;
width: 40px;
height: 100%;
cursor: move;
}
/* 滑块初始背景 */
.dragHandlerBg {
background: #fff no-repeat center url("data:image/png;base64,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");
}
/* 验证成功时的滑块背景 有√*/
.dragHandlerOkBg {
background: #fff no-repeat center url("data:image/png;base64,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");
}
</style>
<script>
//加载（事件会在页面加载完成后触发）
window.onload = function() {
//获取滑动控件容器,灰色背景
var dragContainer = document.getElementById("dragContainer");
//获取滑块左边部分,绿色背景
var dragBg = document.getElementById("dragBg");
//获取滑动验证容器文本
var dragText = document.getElementById("dragText");
//获取滑块
var dragHandler = document.getElementById("dragHandler");
//滑块的最大偏移量 = 滑动验证容器文本长度 - 滑块长度
var maxHandlerOffset = dragContainer.clientWidth - dragHandler.clientWidth;
//是否验证成功的标记
var isVertifySucc = false;
initDrag();
function initDrag() {
//在滑动验证容器文本写入“拖动滑块验证”
dragText.textContent = "拖动滑块验证";
//给滑块添加鼠标按下监听
dragHandler.addEventListener("mousedown", onDragHandlerMouseDown);
}
//选中滑块
function onDragHandlerMouseDown() {
//鼠标移动监听
document.addEventListener("mousemove", onDragHandlerMouseMove);
//鼠标松开监听
document.addEventListener("mouseup", onDragHandlerMouseUp);
}
//滑块移动
function onDragHandlerMouseMove() {
/*
html元素不存在width属性,只有clientWidth
offsetX是相对当前元素的,clientX和pageX是相对其父元素的
*/
//滑块移动量
var left = event.clientX - dragHandler.clientWidth / 2;
//
if(left < 0) {
left = 0;
//如果滑块移动量 > 滑块的最大偏移量 ，则调用验证成功函数
} else if(left > maxHandlerOffset) {
left = maxHandlerOffset;
verifySucc();
}
//滑块移动量
dragHandler.style.left = left + "px";
//绿色背景的长度
dragBg.style.width = dragHandler.style.left;
}
//松开滑块函数
function onDragHandlerMouseUp() {
//移除鼠标移动监听
document.removeEventListener("mousemove", onDragHandlerMouseMove);
//移除鼠标松开监听
document.removeEventListener("mouseup", onDragHandlerMouseUp);
//初始化滑块移动量
dragHandler.style.left = 0;
//初始化绿色背景
dragBg.style.width = 0;
}
//验证成功
function verifySucc() {
//成功标记，不可回弹
isVertifySucc = false;
//容器文本的文字改为白色“验证通过”字体
dragText.textContent = "验证通过";
dragText.style.color = "white";
//验证通过的滑块背景
dragHandler.setAttribute("class", "dragHandlerOkBg");
//移除鼠标按下监听
dragHandler.removeEventListener("mousedown", onDragHandlerMouseDown);
//移除 鼠标移动监听
document.removeEventListener("mousemove", onDragHandlerMouseMove);
//移除鼠标松开监听
document.removeEventListener("mouseup", onDragHandlerMouseUp);
// 匹配成功以后写入你要跳转的页面
window.location.href="成功页面.html";
};
}
</script>
</head>
<body>
<div id="dragContainer"><!-- 容器初始背景 -->
<div id="dragBg"></div><!-- 绿色背景 -->
<div id="dragText"></div><!-- 滑动容器文本 -->
<div id="dragHandler" class="dragHandlerBg"></div>
</div> <!-- 滑块 滑块初始背景 -->
</body>
</html>
效果图：
图片滑动验证
css
.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 {
top: 14px;
background-position: 0 -82px !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: 12px;
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 = 9, // 滑块半径
w = 310, // canvas宽度
h = 155, // canvas高度
PI = Math.PI
const L = l + r * 2 + 3 // 滑块实际边长
function getRandomNumberByRange (start, end) {
return Math.round(Math.random() * (end - start) + start)
}
function createCanvas (width, height) {
const canvas = createElement(‘canvas‘)
canvas.width = width
canvas.height = height
return canvas
}
function createImg (onload) {
const img = createElement(‘img‘)
img.crossOrigin = "Anonymous"
img.onload = onload
img.onerror = () => {
img.src = getRandomImg()
}
img.src = getRandomImg()
return img
}
function createElement (tagName, className) {
const elment = document.createElement(tagName)
elment.className = className
return elment
}
function addClass (tag, className) {
tag.classList.add(className)
}
function removeClass (tag, className) {
tag.classList.remove(className)
}
function getRandomImg () {
return ‘https://picsum.photos/300/150/?image=‘ + getRandomNumberByRange(0, 1084)
}
function draw (ctx, x, y, operation) {
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 = ‘overlay‘
}
function sum (x, y) {
return x + y
}
function square (x) {
return x * x
}
class jigsaw {
constructor ({ el, onSuccess, onFail, onRefresh }) {
el.style.position = el.style.position || ‘relative‘
this.el = el
this.onSuccess = onSuccess
this.onFail = onFail
this.onRefresh = onRefresh
}
init () {
this.initDOM()
this.initImg()
this.bindEvents()
}
initDOM () {
const canvas = createCanvas(w, h) // 画布
const block = canvas.cloneNode(true) // 滑块
const sliderContainer = createElement(‘div‘, ‘sliderContainer‘)
const refreshIcon = createElement(‘div‘, ‘refreshIcon‘)
const sliderMask = createElement(‘div‘, ‘sliderMask‘)
const slider = createElement(‘div‘, ‘slider‘)
const sliderIcon = createElement(‘span‘, ‘sliderIcon‘)
const text = createElement(‘span‘, ‘sliderText‘)
block.className = ‘block‘
text.innerHTML = ‘向右滑动填充拼图‘
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(this, {
canvas,
block,
sliderContainer,
refreshIcon,
slider,
sliderMask,
sliderIcon,
text,
canvasCtx: canvas.getContext(‘2d‘),
blockCtx: block.getContext(‘2d‘)
})
}
initImg () {
const img = createImg(() => {
this.draw()
this.canvasCtx.drawImage(img, 0, 0, w, h)
this.blockCtx.drawImage(img, 0, 0, w, h)
const y = this.y - r * 2 - 1
const ImageData = this.blockCtx.getImageData(this.x - 3, y, L, L)
this.block.width = L
this.blockCtx.putImageData(ImageData, 0, y)
})
this.img = img
}
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, this.x, this.y, ‘fill‘)
draw(this.blockCtx, this.x, this.y, ‘clip‘)
}
clean () {
this.canvasCtx.clearRect(0, 0, w, h)
this.blockCtx.clearRect(0, 0, w, h)
this.block.width = w
}
bindEvents () {
this.el.onselectstart = () => false
this.refreshIcon.onclick = () => {
this.reset()
typeof this.onRefresh === ‘function‘ && this.onRefresh()
}
let originX, originY, trail = [], isMouseDown = false
const handleDragStart = function (e) {
originX = e.clientX || e.touches[0].clientX
originY = e.clientY || e.touches[0].clientY
isMouseDown = true
}
const handleDragMove = (e) => {
if (!isMouseDown) return false
const eventX = e.clientX || e.touches[0].clientX
const eventY = e.clientY || e.touches[0].clientY
const moveX = eventX - originX
const moveY = eventY - originY
if (moveX < 0 || moveX + 38 >= w) return false
this.slider.style.left = moveX + ‘px‘
const 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)
}
const handleDragEnd = (e) => {
if (!isMouseDown) return false
isMouseDown = false
const eventX = e.clientX || e.changedTouches[0].clientX
if (eventX == originX) return false
removeClass(this.sliderContainer, ‘sliderContainer_active‘)
this.trail = trail
const { spliced, verified } = this.verify()
if (spliced) {
if (verified) {
addClass(this.sliderContainer, ‘sliderContainer_success‘)
typeof this.onSuccess === ‘function‘ && this.onSuccess()
} else {
addClass(this.sliderContainer, ‘sliderContainer_fail‘)
this.text.innerHTML = ‘再试一次‘
this.reset()
}
} else {
addClass(this.sliderContainer, ‘sliderContainer_fail‘)
typeof this.onFail === ‘function‘ && this.onFail()
setTimeout(() => {
this.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)
}
verify () {
const arr = this.trail // 拖动时y轴的移动距离
const average = arr.reduce(sum) / arr.length
const deviations = arr.map(x => x - average)
const stddev = Math.sqrt(deviations.map(square).reduce(sum) / arr.length)
const left = parseInt(this.block.style.left)
return {
spliced: Math.abs(left - this.x) < 10,
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
}
}
reset () {
this.sliderContainer.className = ‘sliderContainer‘
this.slider.style.left = 0
this.block.style.left = 0
this.sliderMask.style.width = 0
this.clean()
this.img.src = getRandomImg()
}
}
window.jigsaw = {
init: function (opts) {
return new jigsaw(opts).init()
}
}
}(window))
引用页面：
<link rel="stylesheet" href="../css/hdyz.css">
<script src="../js/myyz.js"></script>
<div id="captcha"></div>
<script type="text/javascript">
jigsaw.init({
el: document.getElementById(‘captcha‘),
})
</script>
效果图：
谢谢观看！
原文地址：https://www.cnblogs.com/huangting/p/11285131.html
时间： 2024-10-07 09:32:33