angular2.x 实现滑动拼图验证码功能

angular2.x 实现滑动拼图验证码功能

滑动拼图验证码功能请参考原文链接，感谢作者分享！
- http://www.cnblogs.com/huanglei-/p/8568405.html
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下面举例说明在angular2版本及以上版本怎么实现此功能。

引入js

首先将封装好的js插件引入到项目目录下

配置js

全局配置
第一种方法是：找到配置文件 angular-cli.json

配置里边的script

第二种方法：直接在index.html中引入即可

引入css文件（全局样式）

直接引入index中的header 标签内即可

组件内使用滑块验证码功能

在login 组件内使用

在login.html中写入html片段

注意：因为在login.html中可能有好几个页面（首页/登录/忘记密码）此时不要通过*ngIf 或者 [hidden] 属性进行现实或隐藏。此处用的是 display：none和display ：block 来控制的，以便滑块验证码初始化的时候可以找到元素。

ts中引用

先在login.component.ts中引入

封装加载的方法：这里我是在页面初始化就加载了，但是可能所在元素是display：none 状态，所以用了一个三元运算符进行取值，以便找到需要初始化的dom

初始化加载 备注：全局只需加载一次即可。

示意图 :鼠标划过的时候 显示图片。

以上就是我的使用心得。在原来基础上做了部分修改，原始的例子和代码请参考原创地址！

http://www.cnblogs.com/huanglei-/p/8568405.html

下面是本例的js css 和 ts

slidingCode.js

(function (window) {
    const l = 42, // 滑块边长
        r = 10, // 滑块半径
        w = 310, // canvas宽度
        h = 155, // canvas高度
        PI = Math.PI
    const L = l + r * 2 // 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) {
        return document.createElement(tagName)
    }

    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, operation, x, y) {
        ctx.beginPath()
        ctx.moveTo(x, y)
        ctx.lineTo(x + l / 2, y)
        ctx.arc(x + l / 2, y - r + 2, r, 0, 2 * PI)
        ctx.lineTo(x + l / 2, y)
        ctx.lineTo(x + l, y)
        ctx.lineTo(x + l, y + l / 2)
        ctx.arc(x + l + r - 2, y + l / 2, r, 0, 2 * PI)
        ctx.lineTo(x + l, y + l / 2)
        ctx.lineTo(x + l, y + l)
        ctx.lineTo(x, y + l)
        ctx.lineTo(x, y)
        ctx.fillStyle = '#fff'
        ctx[operation]()
        ctx.beginPath()
        ctx.arc(x, y + l / 2, r, 1.5 * PI, 0.5 * PI)
        ctx.globalCompositeOperation = "xor"
        ctx.fill()
    }

    function sum(x, y) {
        return x + y
    }

    function square(x) {
        return x * x
    }

    class SlidingVerificationCode {
        constructor(el, success, fail) {
            this.el = el
            this.success = success
            this.fail = fail
        }

        init() {
            this.initDOM()
            this.initImg()
            this.draw()
            this.bindEvents()
        }

        initDOM() {
            const fathers = createElement('div')//父级
            const canvas = createCanvas(w, h) // 画布
            const block = canvas.cloneNode(true) // 滑块
            const sliderContainer = createElement('div')
            const refreshIcon = createElement('div')
            const sliderMask = createElement('div')
            const slider = createElement('div')
            const sliderIcon = createElement('span')
            const text = createElement('span')

            fathers.className='fatherBox';
            fathers.style='';
            canvas.className='myCanvas';
            block.className = 'block';
            sliderContainer.className = 'sliderContainer';
            refreshIcon.className = 'refreshIcon';
            sliderMask.className = 'sliderMask';
            slider.className = 'slider';
            sliderIcon.className = 'sliderIcon';
            text.innerHTML = '向右滑动滑块填充拼图';
            text.className = 'sliderText';
            const el = this.el;
            //el.appendChild(canvas)
            //el.appendChild(refreshIcon)
            //el.appendChild(block)
            fathers.appendChild(canvas)
            fathers.appendChild(refreshIcon)
            fathers.appendChild(block)
            el.appendChild(fathers)
            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.canvasCtx.drawImage(img, 0, 0, w, h) this.blockCtx.drawImage(img, 0, 0, w, h) const y = this.y - r * 2 + 2 const ImageData = this.blockCtx.getImageData(this.x, 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, 'fill', this.x, this.y)
            draw(this.blockCtx, 'clip', this.x, this.y)
        }

        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() }

            let originX, originY, trail = [], isMouseDown = false
            this.slider.addEventListener('mousedown', function (e) { originX = e.x, originY = e.y isMouseDown = true })
            document.addEventListener('mousemove', (e) => { if (!isMouseDown) return false const moveX = e.x - originX const moveY = e.y - originY if (moveX < 0 || moveX + 38 >= w) return false this.slider.style.left = moveX + 'px' var 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) })
            document.addEventListener('mouseup', (e) => { if (!isMouseDown) return false isMouseDown = false if (e.x == originX) return false removeClass(this.sliderContainer, 'sliderContainer_active') this.trail = trail const {spliced, TuringTest} = this.verify() if (spliced) { if (TuringTest) { addClass(this.sliderContainer, 'sliderContainer_success') this.success && this.success() } else { addClass(this.sliderContainer, 'sliderContainer_fail') this.text.innerHTML = '再试一次' this.reset() } } else { addClass(this.sliderContainer, 'sliderContainer_fail') this.fail && this.fail() setTimeout(() => { this.reset() }, 1000) } })
        }

        verify() {
            const arr = this.trail // 拖动时y轴的移动距离
            const average = arr.reduce(sum) / arr.length // 平均值
            const deviations = arr.map(x => x - average) // 偏差数组
            const stddev = Math.sqrt(deviations.map(square).reduce(sum) / arr.length) // 标准差
            const left = parseInt(this.block.style.left)
            return { spliced: Math.abs(left - this.x) < 10, TuringTest: average !== stddev, // 只是简单的验证拖动轨迹，相等时一般为0，表示可能非人为操作 }
        }

        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()
            this.draw()
        }

    }

    window.SlidingVerificationCode = {
        init: function (el, success, fail) {
            new SlidingVerificationCode(el, success, fail).init()
        }
    }
}(window))

css

<style>
    .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 {
      background-position: 0 -83px !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: 10px;
      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;
    }

    .fatherBox {
      display: none;
      position: absolute;
      top: -160px;
    }

    .captcha:hover .fatherBox {
      display: block;
    }

    .myCanvas {
      background-color: #fff;
    }

  style>

html

   <div class="form-group row">
            <div id="captcha" style="position: relative" class="captcha">div>
            <div id="msg">div>
          div>

ts

 public inits = function () {
    let that = this;
    console.log($('div:hidden').find('#captcha').get(0));
    console.log($('div').find('#captcha').get(0));
    var eles=($('div:hidden').find('#captcha').length>0)?$('div:hidden').find('#captcha').get(0):$('div').find('#captcha').get(0);
    SlidingVerificationCode.init(eles, function () {
      document.getElementById('msg').innerHTML = '初始化成功！'
    }, function () {
      document.getElementById('msg').innerHTML = '初始化失败！'
    })
  }

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