js实现html滑动图片拼图验证

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;
 top: 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-top: 15px;
 background: #f7f9fa;
 color: #45494c;
 border: 1px solid #e4e7eb;
 display: block;
}
#bar-mask{
 position: absolute;
 left: 0;
 top: 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('./success.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))

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持我们。