拼图滑块验证

港控/mmm° 2022-04-04 11:54 407阅读 0赞

### 最近找了个拼图滑块验证感觉还不错 ###

<!DOCTYPE html>
    <html lang="en">
    <head>
      <meta charset="UTF-8">
      <title>滑动拼图验证码</title>
      <link rel="stylesheet" href="jigsaw.css">
      <style>
        .container {
          width: 310px;
          margin: 100px auto;
        }
        input {
          display: block;
          width: 290px;
          line-height: 40px;
          margin: 10px 0;
          padding: 0 10px;
          outline: none;
          border:1px solid #c8cccf;
          border-radius: 4px;
          color:#6a6f77;
        }
        #msg {
          width: 100%;
          line-height: 40px;
          font-size: 14px;
          text-align: center;
        }
        a:link,a:visited,a:hover,a:active {
          margin-left: 100px;
          color: #0366D6;
        }
    
      </style>
    </head>
    <body>
    <div class="container">
      <input value="admin" readonly/>
      <input type="password" value="1234567890" readonly/>
      <div id="captcha"></div>
      <div id="msg"></div>
    </div>
    <script src="jigsaw.js"></script>
    <script>
      jigsaw.init({
        el: document.getElementById('captcha'),
        onSuccess: function() {
          document.getElementById('msg').innerHTML = '登录成功！'
        },
        onFail: cleanMsg,
        onRefresh: cleanMsg
      })
      function cleanMsg() {
        document.getElementById('msg').innerHTML = ''
      }
    </script>
    </body>
    </html>

jigsaw.css和jigsaw.js分别是拼图要用到的css和js文件

jigsaw.css代码如下：

.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;
    }

jigsaw.js代码如下：

(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))

效果图如下：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjkyMzQ5_size_16_color_FFFFFF_t_70][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjkyMzQ5_size_16_color_FFFFFF_t_70]: /images/20220404/4bbc211d7bf04299a2d29a16e2e6b48a.png