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js實現(xiàn)移動端圖片滑塊驗證功能

發(fā)布時間：2020-10-11 11:20:58 來源：腳本之家 閱讀：187 作者：一碼平川！ 欄目：開發(fā)技術(shù)

之前寫過一篇uniapp框架的滑塊驗證，今天抽個空用原生js實現(xiàn)這個功能，pc端暫時不做，因為pc端只要把touch事件改成mouse事件就能實現(xiàn)，這里就不再重復(fù)寫了。
(最新完美版本，js+canvas實現(xiàn)，兼容pc，ie9和移動，js+cavans實現(xiàn)圖片滑塊驗證)

老樣子，還是先看效果

js實現(xiàn)移動端圖片滑塊驗證功能

原理和上篇uniapp的滑塊一樣，不一樣的是這里是純js實現(xiàn)，代碼是全部是自己寫的，有不清楚的可以留言。

下面是全部代碼：

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">
  <title>Document</title>
  <style>
    * {
      margin: 0;
      padding: 0;
    }
 
 
    .sliderModel {
      position: fixed;
      left: 0;
      top: 0;
      width: 100%;
      height: 100%;
      background: rgba(0, 0, 0, 0.5);
      display: flex;
      justify-content: center;
      align-items: center;
      display: none;
    }
 
    .title {
      width: 100%;
      height: 60px;
      font-size: 18px;
      color: #333;
      display: flex;
      align-items: center;
      justify-content: center;
    }
 
    .cont {
      position: relative;
      background: #fff;
      width: 300px;
      border-radius: 8px;
      overflow: hidden;
      padding-bottom: 20px;
    }
 
    .imgWrap {
      position: relative;
      width: 280px;
      height: 150px;
      border-radius: 8px;
      margin: 0 auto;
      overflow: hidden;
    }
 
    #sliderRefresh {
      position: absolute;
      top: 20px;
      right: 30px;
      cursor: pointer;
      color: green;
    }
 
    .img {
      display: block;
      width: 100%;
      height: 100%;
    }
 
    .sliderOver {
      position: absolute;
      left: 0;
      top: 0;
      width: 50px;
      height: 50px;
      background: #ddd;
      box-shadow: inset 0 0 5px rgba(0, 0, 0, 0.3);
    }
 
    .smartImg {
      position: absolute;
      z-index: 2;
      left: 0;
      top: 0;
      width: 50px;
      height: 50px;
      overflow: hidden;
      box-shadow: 0 0 5px rgba(0, 0, 0, 0.3);
    }
 
    .simg {
      position: absolute;
      display: block;
      width: 280px;
      height: 150px;
    }
 
 
 
 
    .sliderBox {
      width: 280px;
      margin: 10px auto 0;
      height: 36px;
      position: relative;
    }
 
    .sliderF {
      width: 100%;
      height: 100%;
      z-index: 3;
    }
 
    .sliderS {
      cursor: pointer;
      position: absolute;
      left: 0;
      top: 0;
      z-index: 2;
      height: 36px;
      width: 36px;
      background: #007cff;
      border-radius: 36px;
      display: flex;
      justify-content: center;
      align-items: center;
    }
 
    .icon {
      width: 20px;
      height: 20px;
 
    }
 
 
    .bgC {
      position: absolute;
      z-index: 1;
      left: 0;
      top: 50%;
      transform: translateY(-50%);
      width: 100%;
      height: 30px;
      border-radius: 30px;
      line-height: 30px;
      font-size: 14px;
      color: #999999;
      box-shadow: inset 0 0 4px #ccc;
      text-align: center;
      overflow: hidden;
    }
 
    .bgC_left {
      position: absolute;
      left: 0;
      top: 50%;
      transform: translateY(-50%);
      width: 0;
      height: 28px;
      border-top-left-radius: 28px;
      border-bottom-left-radius: 28px;
      line-height: 28px;
      font-size: 14px;
      background-color: #eee;
      box-shadow: inset 0 0 4px #ccc;
      text-align: center;
    }
 
 
    .showMessage {
      text-align: center;
      font-size: 14px;
      height: 30px;
      line-height: 30px;
    }
 
    #closeBtn {
      position: fixed;
      z-index: 10;
      bottom: 10px;
      left: 50%;
    }
  </style>
</head>
 
<body>
  <div id="clickBtn">點擊</div>
  <div class="sliderModel">
    <div class="cont">
      <div class="title">圖形驗證</div>
      <div id="sliderRefresh">刷新</div>
      <div class="imgWrap" id="imgWrap">
        <img class="img" src="" />
        <div class="sliderOver" id="sliderOver"></div>
        <div class="smartImg" id="smartImg">
          <img class="simg" src="" />
        </div>
      </div>
      <div class="sliderBox">
        <div class="sliderF" id="slider">
          <div class="sliderS" id="sliderBtn">
            <img class="icon" src="images/slider/sangangy.png" />
          </div>
        </div>
        <div class="bgC">
          拖動左邊滑塊完成上方拼圖
          <div class="bgC_left" id="bgC_left"></div>
        </div>
      </div>
      <div class="showMessage">
 
      </div>
    </div>
  </div>
  <div id="closeBtn">關(guān)閉</div>
 
</body>
<script src="slider.js"></script>
<script>
  var object = {
    bImg: 'imgWrap',
    sImg: 'smartImg',
    sImgOver: 'sliderOver',
    sliderF: 'slider',
    sliderBtn: 'sliderBtn',
    sliderBg: 'bgC_left',
    refreshBtn: 'sliderRefresh',
    range: 5,
    imgArr: ['images/sliderz/1.jpg', 'images/sliderz/2.jpg', 'images/sliderz/3.jpg', 'images/sliderz/4.jpg',
      'images/sliderz/5.jpg'
    ],
    refreshCallback: function (e) {
      var showMessage = document.getElementsByClassName('showMessage')[0];
      showMessage.innerHTML = "";
      showMessage.style.color = "#333";
    },
    callback: function (e) {
      var showMessage = document.getElementsByClassName('showMessage')[0];
      if (!e) {
        showMessage.innerHTML = "驗證失敗，請重新驗證";
        showMessage.style.color = "red";
      } else {
        showMessage.innerHTML = "驗證成功！";
        showMessage.style.color = "green";
      }
    },
  }
  var mSlider = null;
  document.getElementById('clickBtn').onclick = function () {
    document.getElementsByClassName('sliderModel')[0].style.display = "flex";
    mSlider = new window.mobileSlider(object)
  }
  document.getElementById('closeBtn').onclick = function () {
    document.getElementsByClassName('sliderModel')[0].style.display = "none";
  }
</script>
 
</html>

js部分（slider.js）

(function () {
 
  function mobileSlider(params) {
    var object = {
      bImg: params.bImg, //大圖片的盒子
      sImg: params.sImg, //圖片上的小圖片
      sImgOver: params.sImgOver, //圖片上的占位區(qū)域
      sliderF: params.sliderF, //滑塊的父元素
      sliderBtn: params.sliderBtn, //滑塊
      sliderBg: params.sliderBg, //滑塊滑動過程中的背景塊
      refreshBtn: params.refreshBtn, //刷新按鈕
      range: params.range, //驗證通過的運行范圍值
      imgArr: params.imgArr, //圖片數(shù)組
      refreshCallback: params.refreshCallback, //刷新回調(diào)
      callback: params.callback //驗證回調(diào)函數(shù)，true為成功，false為失敗
    };
 
    var sliderF = document.getElementById(object.sliderF);
    var sliderBtn = document.getElementById(object.sliderBtn);
    var sliderBg = document.getElementById(object.sliderBg);
    var sImg = document.getElementById(object.sImg);
    var bImg = document.getElementById(object.bImg);
    var sImgOver = document.getElementById(object.sImgOver);
    var refreshBtn = document.getElementById(object.refreshBtn);
    var max_left = sliderF.offsetWidth - sliderBtn.offsetWidth;
    var sImgBeginLeft = 0;
 
 
    function refresh() {
      sliderBtn.style.left = sliderBg.style.width = 0;
      sImgBeginLeft = 0;
      var ram = Math.random();
      var imgIndex = Math.floor(object.imgArr.length * ram);
      var imgSrc = object.imgArr[imgIndex];
      bImg.getElementsByClassName('img')[0].src = sImg.getElementsByClassName('simg')[0].src = imgSrc;
      sImgOver.style.left = Math.floor(bImg.offsetWidth / 2 + bImg.offsetWidth / 2 * ram - sImgOver.offsetWidth - 6) + "px";
      sImg.style.left = sImgBeginLeft = Math.floor((bImg.offsetWidth / 2 - sImgOver.offsetWidth) * ram) + "px";
      sImgOver.style.top = sImg.style.top = Math.floor((bImg.offsetHeight - sImgOver.offsetWidth - 10) * ram + 10) + "px";
      sImg.getElementsByClassName('simg')[0].style.left = -Math.floor(bImg.offsetWidth / 2 + bImg.offsetWidth / 2 * ram - sImgOver.offsetWidth - 6) + "px";
      sImg.getElementsByClassName('simg')[0].style.top = -Math.floor((bImg.offsetHeight - sImgOver.offsetWidth - 10) * ram + 10) + "px";
      object.refreshCallback(true)
    }
    refresh();
 
    sliderBtn.ontouchstart = function (e) {
      var ev = e || window.event
      var downX = ev.touches[0].pageX;
      var sImgLeft = parseInt(sImg.style.left);
      this.ontouchmove = function (e) {
        var ev = e || window.event;
        var leftX = ev.touches[0].pageX - downX;
        leftX = leftX < 0 ? 0 : (leftX < max_left ? leftX : max_left)
        sliderBtn.style.left = leftX + 'px';
        sliderBg.style.width = leftX + sliderBtn.offsetWidth / 2 + "px";
        sImg.style.left = leftX + sImgLeft + "px";
      }
      this.ontouchend = function (e) {
        this.ontouchmove = null; //移除移動事件
        var sImgLeft = parseInt(sImg.style.left);
        var sImgOverLeft = parseInt(sImgOver.style.left);
        if (Math.abs(sImgOverLeft - sImgLeft) < object.range) {
          object.callback && object.callback(true)
        } else {
          object.callback && object.callback(false)
          var timer = null,
            step = 10;
          var sliderBtnLeft = parseInt(sliderBtn.style.left)
          timer = setInterval(function () {
            sliderBtnLeft -= step;
            step += 5;
            if (sliderBtnLeft <= 0) {
              clearInterval(timer);
              sliderBtnLeft = 0;
              sliderBtn.style.left = sliderBg.style.width = 0;
              sImg.style.left = parseInt(sImgBeginLeft) + "px"
            }
            sliderBtn.style.left = sliderBg.style.width = sliderBtnLeft + "px";
            sImg.style.left = sliderBtnLeft + parseInt(sImgBeginLeft) + "px"
          }, 20)
 
        }
      }
    };
 
 
 
    refreshBtn.ontouchstart = function () {
      refresh()
    }
 
  }
 
  window.mobileSlider = mobileSlider;
})()

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