實現思路：
監聽滑塊的移動事件，獲取它離左側的距離，賦值給分離出來的驗證模塊就可以了，至於陷下去的模塊，得到圖片的大小，根據圖片的長寬的一半隨機賦值吧（因為這個模塊一般都在右側靠中間的位置）
這種滑動解鎖應該是有兩張圖片，一張正常的，一張上面有解鎖區域的（后端給），然后前端只用把用戶釋放鼠標后，滑動模塊在圖片上的xy軸傳給后端，后端做成功與否的判斷。
純js的實現：
只是前端驗證，不具備高安全性。
html代碼：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>滑動驗證</title>
<link rel="stylesheet" href="css/index.css">
</head>
<body>
<div class="box">
<div class="imgBox">
<div class="verify"></div>
<div class="verified"></div>
</div>
<div class="handle">
<span class="swiper"></span>
<span class="text">拖動滑塊</span>
</div>
<div class="refreshBox">
<span class="refresh">點擊切換圖片</span>
</div>
</div>
<script src='js/jquery-3.1.1.min.js'></script>
<script src='js/index.js'></script>
</body>
css代碼:
.box {
width: 300px;
padding: 20px;
background-color: #fff;
box-shadow: 2px 2px 8px 0 rgba(0, 0, 0, 0.4);
}
.imgBox {
position: relative;
width: 300px;
overflow: hidden;
box-shadow: 0 0 8px 0 rgba(0, 0, 0, 0.4);
}
.imgBox img {
width: 100%;
}
.imgBox div {
display: none;
}
.handle {
display: flex;
align-items: center;
position: relative;
height: 30px;
border-radius: 20px;
margin: 20px 0;
padding: 4px 0 4px 70px;
box-shadow: 0 0 20px 0 rgba(0, 0, 0, 0.2) inset;
background: #f5f5f5;
user-select: none;
}
.text {
opacity: 1;
transition: opacity 0.5s ease-in-out;
color: #aaa;
}
.swiper {
position: absolute;
top: -10px;
left: 0px;
width: 58px;
height: 58px;
border-radius: 50%;
background-color: pink;
box-shadow: 2px 2px 6px 0 rgba(0, 0, 0, 0.2);
}
.verify {
position: absolute;
left: 10px;
width: 38px;
height: 38px;
border-radius: 5px;
background-repeat: no-repeat;
background-attachment: scroll;
background-size: 300px;
box-shadow: 0 0 10px 0 rgba(0, 0, 0, 0.4), 0 0 10px 0 rgba(90, 90, 90, 0.4);
z-index: 10;
}
.verified {
position: absolute;
width: 38px;
height: 38px;
border-radius: 5px;
background-color: rgba(0, 0, 0, 0.1);
box-shadow: 0 0 10px 0 rgba(0, 0, 0, 0.4) inset;
}
.refreshBox {
border-top: 1px solid #ccc;
padding: 15px 0 0 5px;
}
.refresh {
color: #fff;
cursor: pointer;
-webkit-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
user-select: none;
padding: 8px 20px;
border-radius: 20px;
background-color: #555;
box-shadow: 0 0 10px 0 rgba(0, 0, 0, 0.4);
transition: all 0.5s ease-in-out;
}
.refresh.click {
box-shadow: 0 0 10px 0 rgba(0, 0, 0, 0.4) inset;
}
虎課網https://www.wode007.com/sites/73267.html 設計塢https://www.wode007.com/sites/73738.html
js代碼：
var box = $('.box'),
imgBox = $('.imgBox'),
handle = $('.handle'),
swiper = $('.swiper'),
text = $('.text'),
verify = $('.verify'),
verified = $('.verified'),
refresh = $('.refresh')
// 圖片集合
var imgs = []
for (let i = 1; i < 17; i++) {
imgs.push('' + i + i)
}
$(function() {
// 隨機添加背景圖
refreshImg()
refresh.click(function() {
e = event || window.event
e.stopPropagation()
refreshImg()
start()
})
refresh.mousedown(function() {
$(this).addClass('click')
})
refresh.mouseup(function() {
$(this).removeClass('click')
})
window.onload = start()
})
function start() {
var verImg = document.getElementsByClassName('verImg')[0]
if (verImg) {
verImg.onload = function() {
// 獲取圖片高度
var imgH = this.clientHeight
// 隨機生成坐標（圖片框固定寬度為300px，高度不定）
var verX = 150 * (1 + Math.random()) - 38,
verY = imgH / 4 + Math.random() * imgH / 2
// 用戶移動滑塊函數
fnDown(verX, verY)
}
}
}
function fnDown(verX, verY) {
swiper.mousedown(function() {
e = event || window.event
e.stopPropagation()
// 30為模塊寬度
verify.css({
display: 'block',
top: `${verY}px`,
'background-position': `-${verX}px -${verY}px`
})
verified.css({ display: 'block', left: `${verX}px`, top: `${verY}px` })
// 獲取鼠標到按鈕的距離
var disX = e.clientX - $(this).offset().left,
disY = e.clientY - $(this).offset().top
text.css('opacity', '0')
// 防止重復綁定觸發多次
box.unbind('mousemove')
box.unbind('mouseup')
// 移動
box.bind('mousemove', function() {
e = event || window.event
fnMove(e, disX, disY)
})
// 釋放
box.bind('mouseup', function() {
var stopL = verify.offset().left - 28
// 誤差在2px以內則算做成功
if (Math.abs(stopL - verX) > 2) {
alert('驗證失敗')
} else {
alert('驗證成功')
}
// 解除綁定，並將滑動模塊歸位
box.unbind('mousemove')
swiper.css('left', '0px')
verify.css('left', '10px')
text.css('opacity', '1')
box.unbind('mouseup')
})
})
}
function fnMove(e, posX, posY) {
// 這里的e是以鼠標為參考
var l = e.clientX - posX - $(handle).offset().left,
winW = $(handle).width() + 29
// 限制拖動范圍只能在handle中
if (l < 0) {
l = 0
} else if (l > winW) {
l = winW
}
swiper.css('left', `${l}px`)
verify.css('left', `${l + 10}px`)
}
function refreshImg() {
// 隨機生成下標
var index = Math.round(Math.random() * 15)
var imgH = 0
verify.hide()
verified.hide()
var verImg = $('.verImg')
if (verImg.length) {
verImg.attr('src', `imgs/${imgs[index]}.jpg`)
} else {
imgBox.prepend(`<img class='verImg' src="imgs/${imgs[index]}.jpg" />`)
}
verify.css('background-image', `url('imgs/${imgs[index]}.jpg')`)
}