效果图:
具体代码:
test.vue
//整个页面是个弹窗 visible 控制弹窗的显示关闭 默认打开
<template>
<div class="mask_layer_model" v-if="visible" style="z-index: 9;">
<div class="captcha_model">
<div class="header">
<span>请完成安全验证</span>
<span style="float: right" title="关闭验证码" @click="close">
<i class="iconfont icon-Close"></i>
</span>
</div>
<div class="content">
<div class="sliding-pictures">
<i class="iconfont icon-shuaxin" @click="onRefresh" title="刷新验证码"></i>
<div id="captcha">
</div>
</div>
</div>
<div class="sliderContainer">
<div class="sliderMask">
<div class="slider">
<span class="sliderIcon"></span>
</div>
</div>
<span class="sliderText">向右滑动填充拼图</span>
</div>
</div>
</div>
</template>
<script>
import './captcha.scss'
export default {
data() {
return {
visible: true,
cv:{
w:310,
h:155,
},
block:{
l:42, // 滑块边长
L:42+9*2+3,// 滑块实际边长
r:9, // 滑块半径
},
randomPos:{
x:0,
y:0,
},
canvasCtx:null,
blockCtx:null,
blockDom:null,
sliderDom:null,
sliderContainerDom:null,
sliderMaskDom:null,
el:null,
img:null,
trail:null,
};
},
watch: {
},
beforeCreate() {},
created() {},
beforeMount() {},
mounted() {
this.init();
},
methods: {
close(){
this.visible = false
},
init(){
this.canvasInit();
this.initImg();
this.bindEvents();
},
onRefresh(){
this.reset()
},
onSuccess(){
this.$msg.success("登录成功!");
},
onFail(){
this.$msg.warning("再试一次!");
},
bindEvents () {
this.el.onselectstart = () => false
let originX, originY, trail = [], isMouseDown = false
const addClass = function (tag, className) {
tag.classList.add(className)
}
const removeClass = function (tag, className) {
tag.classList.remove(className)
}
const handleDragStart = function (e) {
originX = e.clientX || e.touches[0].clientX
originY = e.clientY || e.touches[0].clientY
isMouseDown = true
console.log(originX)
}
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 >= this.cv.w) return false
this.sliderDom.style.left = moveX + 'px'
const blockLeft = (this.cv.w - 40 - 20) / (this.cv.w - 40) * moveX
this.blockDom.style.left = blockLeft + 'px'
addClass(this.sliderContainerDom, 'sliderContainer_active')
this.sliderMaskDom.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.sliderContainerDom, 'sliderContainer_active')
this.trail = trail
const { spliced, verified } = this.verify()
if (spliced) {
if (verified) {
addClass(this.sliderContainerDom, 'sliderContainer_success')
this.onSuccess();
} else {
addClass(this.sliderContainerDom, 'sliderContainer_fail')
this.onFail();
this.reset()
}
} else {
addClass(this.sliderContainerDom, 'sliderContainer_fail')
this.onFail();
setTimeout(() => {
this.reset()
}, 1000)
}
}
this.sliderDom.addEventListener('mousedown', handleDragStart)
this.sliderDom.addEventListener('touchstart', handleDragStart)
this.blockDom.addEventListener('mousedown', handleDragStart)
this.blockDom.addEventListener('touchstart', handleDragStart)
document.addEventListener('mousemove', handleDragMove)
document.addEventListener('touchmove', handleDragMove)
document.addEventListener('mouseup', handleDragEnd)
document.addEventListener('touchend', handleDragEnd)
},
verify () {
const sum = function (x, y) {
return x + y
}
const square = function (x) {
return x * x
}
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.blockDom.style.left)
return {
spliced: Math.abs(left - this.randomPos.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.sliderContainerDom.className = 'sliderContainer'
this.sliderDom.style.left = 0
this.blockDom.style.left = 0
this.sliderMaskDom.style.width = 0
this.clean()
this.img.setSrc(this.getRandomImgSrc())
},
clean () {
this.canvasCtx.clearRect(0, 0, this.cv.w, this.cv.h)
this.blockCtx.clearRect(0, 0, this.cv.w, this.cv.h)
this.blockDom.width = this.cv.w
},
draw () {
// 随机创建滑块的位置
this.randomPos.x = this.getRandomNumberByRange(this.block.L + 10, this.cv.w - (this.block.L + 10))
this.randomPos.y = this.getRandomNumberByRange(10 + this.block.r * 2, this.cv.h - (this.block.L + 10))
this.drawBlock(this.canvasCtx, this.randomPos.x, this.randomPos.y, 'fill')
this.drawBlock(this.blockCtx, this.randomPos.x, this.randomPos.y, 'clip')
},
drawBlock(ctx, x, y, operation) {
let r = this.block.r,
l = this.block.l,
PI = Math.PI;
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 = 'destination-over'
},
initImg(){
const img = this.createImg(() => {
this.draw()
this.canvasCtx.drawImage(img, 0, 0, this.cv.w, this.cv.h)
this.blockCtx.drawImage(img, 0, 0, this.cv.w, this.cv.h)
const y = this.randomPos.y - this.block.r * 2 - 1;
const ImageData = this.blockCtx.getImageData(this.randomPos.x - 3, y, this.block.L, this.block.L)
this.blockDom.width = this.block.L
this.blockCtx.putImageData(ImageData, 0, y)
})
this.img = img
},
canvasInit(){
const canvas = this.createCanvas(this.cv.w, this.cv.h) // 画布
const block = canvas.cloneNode(true) // 滑块
block.className = 'block'
const el = this.el = document.getElementById('captcha');
el.style.position = 'relative'
el.style.width = this.cv.w + 'px'
Object.assign(el.style, {
position: 'relative',
width: this.cv.w + 'px',
margin: '0 auto'
})
this.el = el
el.appendChild(canvas)
el.appendChild(block)
this.canvasCtx = canvas.getContext("2d");
this.blockCtx = block.getContext("2d");
this.blockDom=block;
this.sliderDom=document.getElementsByClassName('slider')[0];
this.sliderContainerDom=document.getElementsByClassName('sliderContainer')[0];
this.sliderMaskDom=document.getElementsByClassName('sliderMask')[0];
console.log(this.sliderDom)
},
createCanvas (width, height) {
const canvas = document.createElement('canvas')
canvas.width = width
canvas.height = height
return canvas
},
createImg (onload) {
const img = new Image()
img.crossOrigin = "Anonymous"
img.onload = onload
img.onerror = () => {
img.setSrc(this.getRandomImgSrc())
}
img.setSrc = (src) =>{
if (window.navigator.userAgent.indexOf('Trident') > -1) { // 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
const xhr = new XMLHttpRequest()
xhr.onloadend = (e) =>{
const 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.getRandomImgSrc())
return img
},
getRandomNumberByRange (start, end) {
return Math.round(Math.random() * (end - start) + start)
},
getRandomImgSrc () {
return 'https://picsum.photos/300/150/?image=' + this.getRandomNumberByRange(0, 1084)
// return 'https://picsum.photos/id/407/300/150'
},
}
};
</script>
captcha.scss
.block {
position: absolute;
left: 0;
top: 0;
cursor: pointer;
cursor: grab;
}
.block:active {
cursor: pointer;
cursor: grabbing;
}
.sliderContainer {
position: relative;
text-align: center;
width: 310px;
height: 40px;
line-height: 40px;
margin-top: 15px;
background: #f7f9fa;
color: #45494c;
border: 1px solid #e4e7eb;
margin-left: 4%;
}
.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;
margin-left: -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);
transition: background .2s linear;
cursor: pointer;
cursor: grab;
}
.slider:active {
cursor: grabbing;
}
.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;
}
.captcha_model{
background-color: white;
margin-left: 5%;
margin-right: 5%;
.header{
font-size: .18rem;
padding: 2% 5%;
border-bottom: 1px solid #ccc;
}
.content{
padding-top: .1rem;
.sliding-pictures{
position: relative;
i{
position: absolute;
right: 7%;
z-index: 9;
font-size: .22rem;
}
}
}
}
.mask_layer_model{
position: fixed;
top: 0;
left: 0;
width: 100%;
height: 100%;
background: rgba(0, 0, 0, 0.6);
font-size: .13rem;
}