js实现html滑动图片拼图验证
网络编程 2021-07-04 15:03www.168986.cn编程入门
这篇文章主要为大家详细介绍了js实现html滑动图片拼图验证，文中示例代码介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们可以参考一下
本文实例为大家分享了js实现html滑动图片拼图验证的具体代码，供大家参考，具体内容如下
html
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <link rel="stylesheet" href="./index.css" > <title>Document</title> </head> <body> <div class="container"> <canvas width="310" height="155" id="canvas"></canvas> <canvas width="310" height="155" id="block"></canvas> <div class="refreshIcon"></div> <div class="bar"> <div id="bar-mask"> <div class="verSliderBlock"></div> </div> <span id="slide">向右滑动验证</span> </div> </div> <script src="./index.js"></script> </body>
css:
{
margin: 0;
padding: 0;
}
body {
background-color: #E8E8E8;
}
.container{
position: relative;
}
#canva{
background: indianred;
}
#block{
position: absolute;
left: 0px;
}
.refreshIcon{
position: absolute;
left: 280px;
: 5px;
width: 21px;
height: 20px;
cursor: pointer;
background: url(./refresh.png);
display: block;
}
.verSliderBlock{
height: 40px;
width: 40px;
background-color: #fff;
background:url('./right_arrow.png');
background-size:100%;
box-shadow: 0 0 3px rgba(0, 0, 0, .3);
cursor: pointer;
position: absolute;
text-align: center;
line-height: 40px;
color: #45494c;
font-size: 25px;
font-weight: 400;
}
.bar{
position: relative;
text-align: center;
width: 310px;
height: 40px;
line-height: 40px;
margin-: 15px;
background: #f7f9fa;
color: #45494c;
border: 1px solid #e4e7eb;
display: block;
}
#bar-mask{
position: absolute;
left: 0;
: 0;
height: 40px;
border: 0 solid #1991fa;
background: #d1e9fe;
}
js:
(function(window){
var canvas = document.getElementById('canvas');
var block = document.getElementById('block');
var canvas_ctx = canvas.getContext('2d')
var block_ctx = block.getContext('2d')
var img = document.createElement('img')
var refresh = document.querySelector('.refreshIcon')
var x = Math.round(Math.random() 200) + 10,
y = Math.round(Math.random() 100) + 10,
w = 42,
l = 42,
r = 10,
PI = Math.PI
console.log(x,y)
//获取图片后面的随机号码
function getRandomNumberByRange(start, end) {
return Math.round(Math.random() (end - start) + start)
}
//初始化图片
function initImg(){
img.onload = function () {
canvas_ctx.drawImage(img, 0, 0, 310, 155)
block_ctx.drawImage(img, 0, 0, 310, 155)
var blockWidth = w + r 2
var _y = y - r 2 + 2 // 滑块实际的y坐标
var ImageData = block_ctx.getImageData(x, _y, blockWidth, blockWidth)
block.width = blockWidth
block_ctx.putImageData(ImageData, 0, _y)
};
img.crossOrigin = "Anonymous"
img.src = 'https://picsum.photos/300/150/?image=' + getRandomNumberByRange(0, 100)
}
//清除tupian
function clean(){
x = Math.round(Math.random() 200) + 10,
y = Math.round(Math.random() 100) + 10,
console.log(x,y)
canvas_ctx.clearRect(0, 0, 310, 155);
block_ctx.clearRect(0, 0, 310, 155)
block.width = 310
draw(canvas_ctx, 'fill')
draw(block_ctx, 'clip')
}
//绘制方块
function draw(ctx, 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'
}
initImg()
draw(canvas_ctx, 'fill')
draw(block_ctx, 'clip')
//添加移动事件
var block_slider = document.querySelector("#block");
var slider = document.querySelector(".verSliderBlock");
var slider_mark = document.querySelector("#bar-mask");
//用于判断当前是否是在按住滑块的情况下
var yd = false
var moveX = 0
var downX = 0
//鼠标按下
slider.onmousedown = function (e) {
downX = e.clientX;
yd = true
}
//鼠标移动事件
function hadleMousemove(e) {
if (yd) {
moveX = e.clientX - downX;
document.querySelector('#slide').innerHTML = ''
if (moveX >= 310) {
moveX = 310 - 40
}
if (moveX > -2) {
slider.style.backgroundColor = "#1991FA";
slider_mark.style.borderWidth = "1px"
slider_mark.style.borderColor = "#1991fa"
slider_mark.style.width = moveX + 40 + "px";
block_slider.style.left = (310 - 40 - 20) / (310 - 40) moveX + "px";
slider.style.left = moveX + "px";
}
}
}
//鼠标抬起事件
function hadleMouseup(e) {
if (yd) {
slider.onmousemove = null;
console.log(moveX)
block_slider.style.left = (310 - 40 - 20) / (310 - 40) moveX + "px";
if (Math.abs((310 - 40 - 20) / (310 - 40) moveX - x) < 10) {
slider.style.background = "url('./suess.png')";
slider.style.backgroundSize = '100%'
// alert('验证成功')
setTimeout(() => {
rest();
}, 1000)
} else {
slider_mark.style.backgroundColor = "#fce1e1"
slider_mark.style.borderWidth = "1px"
slider_mark.style.borderColor = "#f57a7a"
slider.style.backgroundColor = "#f57a7a";
slider.style.background = "url('./fail.png')";
slider.style.backgroundSize = '100%'
setTimeout(() => {
rest();
}, 1000)
}
yd = false
}
}
//鼠标在按住滑块下移动
slider.onmousemove = function (e) {
hadleMousemove(e)
}
//鼠标在滑块下抬起
slider.onmouseup = function (e) {
hadleMouseup(e)
}
//设置全局的移动事件,当鼠标按下滑块后,移动过程中鼠标可能会移出滑块,这是滑块也会监听鼠标的移动进行相应的移动
document.addEventListener('mousemove', function (e) {
hadleMousemove(e)
})
document.addEventListener('mouseup', function (e) {
hadleMouseup(e)
})
function rest() {
clean()
document.querySelector('#slide').innerHTML = '向右滑动验证'
slider.style.backgroundColor = "#fff";
slider.style.left = "0px"
slider.style.background = "url('./right_arrow.png')";
slider.style.backgroundSize = '100%'
block_slider.style.left = "0px"
slider_mark.style.width = "0px"
slider_mark.style.backgroundColor = "#d1e9fe"
slider_mark.style.borderWidth = "0px"
slider_mark.style.borderColor = "#d1e9fe"
initImg()
}
//刷新
refresh.onclick = function(){
rest()
}
}(window))
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