JS制作图形验证码实现代码

    /**
     供货商店铺－店铺简介
     */
     //1-在路由层进行设置，页面跳转到根目录下/buyer/vshop/info.ejs页面进行跳转，然后在回调函数中进行接口的调用
      router.get('/buyer/vshop/info', function(req, res, next) { 
     //2-调用接口获取数据   
      async.parallel({ 
        verifycode :function(fn){
        //3-调用接口获取本机的IP地址
          var args= {
            userIp: tools.getClientIp(req)
          };

          //4-调用接口verifyCodeHelper的createVcode方法获取captcha与 csnonce的数据，他们的值都是腾讯接口verifyCodeHelper返回的数据

          verifyCodeHelper.createVcode(args, function(err, result){
            if (err) {
              console.log(err);
            }
            else{
              fn(null, {
                captcha: result.data.queryUrl,
                csnonce: result.csnonce || 0
              })
            }
          });
        }
      },function(err, result){
        if (err) {
          res.end(err);
        }else{
          result.getDetail= res.shopInfo;
          var fxzStatus = res.fxzStatus || {};

        //5-进行根目录下buyer/vshophttps://img.qb5200.com/download-x/describe页面的渲染，传递相关参数到EJS页面

          res.render("buyer/vshophttps://img.qb5200.com/download-x/describe", {  
            title: srcBizType==1 ? result.getDetail.name : "店铺简介",
            pageName:"vshopInfo",
            captcha:result.verifycode.captcha,//验证码
            isTencent: 1,
            csnonce:result.verifycode.csnonce
          });
        }
      });
    });

  <%- include ../../header %>
   //1-获取路由传递的 csnonce
  <script>
    APP.newLogin= {
      csnonce: '<%- csnonce %>',
    };
  <link href="/css/vshophttps://img.qb5200.com/download-x/describe.css?v=<%= config.version %>" rel="stylesheet" />
  <style id="dynamic"></style>
  <div class="arrow_mask"></div>
  <div class="arrow">
    <div>
      <img src="/imgs/vshop/verification-code-back.png" class="verification-code-back" />
    </div>
    <ul class="arrow-mess"> <span class="sku-close" id="btn_sku_dialog_close"> </span>
      <li>请输入下面的图形验证码</li>
      <li>
          <img id="J_BtnVerifyPicCodeTencent" src="" class="captcha" style="height:30px;margin:0 15px;" />
      </li>
      <li>
        <div class="btn_mes">
          <input class="btn_mes_text" type="text" maxlength="6">
        </div>
      </li>
    </ul>
    <div class="btn_mes2">
      <input type="button" class="license-submit" value="提交">
    </div>
  </div>
  <div data-role="container" class="body <%= pageName %>">
    <header data-role="header">
      <%- include ./widget_vshop %>
    </header>
    <section data-role="body" class="section-body">
      <div class="div-section div-section-info">
        <ul class="info1">
          <li class="gap"><div class="left">所在地</div><div class="right"><%- detail.address%></div></li>
          <li><div class="left">开店时间</div><div class="right"><%- detail.createTime%></div></li>
        </ul>
        <ul class="info2">
          <li class="gap"><div class="left">发货速度</div><div class="right"><%- detail.score.express%></div></li>
          <li class="gap"><div class="left">服务态度</div><div class="right"><%- detail.score.service%></div></li>
          <li><div class="left">描述相符</div><div class="right"><%- detail.score.describe%></div></li>
        </ul>
        <ul class="info3">
          <%if(detail.shopTypeIndex==1||detail.shopTypeIndex==2||detail.shopTypeIndex==3){var bg = '/imgs/vshop/tip.png',color='#39dda5' }else{var bg = '/imgs/vshop/tip3.png',color='#59aaff'}%>
          <li><div class="left anotherC">认证</div><div class="right textR"><span style="background: url(<%-bg%>) left 1px no-repeat;background-size: 14px 12px;"><i style="background: <%-color%>"><%- detail.shopType %></i></span></div></li>
        </ul>
        <ul class="info4">
          <li><a href="tel:<%- detail.phone%>" class="tel">服务电话</a></li>
          <li><a data-aid="<%- aid%>" class="webim">在线客服</a></li>
          <li class="business-license">
            <!--<a href="/buyer/vshop/license?aid=<%- aid%>">-->
            <a href="#">
              <span >营业执照</span>
              <label>查看<span></span></label>
            </a>

          </li>
        </ul>
      </div>
      <%- include ./footer %>
      <div id="vue_hooker">
        <child-nav></child-nav>
        <%- include ../../widget_navBtns %>
      </div> 
    </section>
  </div>
  //2-获取路由传递的captcha
  <script type="text/javascript" src="<%= captcha %>"></script>
  //3-引入相关ＪＳ文件
  <script>
    seajs.use("js_cmd/vshop/home-cmd");
  </script>
  <%- include ../../footer %>

 /**
   这是一个公用文件，vshop首页&vshop全部商品共用
   */
  //1-引入页面所需的各个模块
  define(function (require, exports, module) {
    var $ = require("./top-suction-cmd"),
      myDialog = require("lib_cmd/myDialog-cmd"),
      main = require("js_cmd/main-cmd"),
      DataLoader = require("./tool-cmd"),
      fxzTool = require("./fxzTool-cmd"),
      Vue = require("lib_cmd/vue-cmd"),
      widget_navBtns = require("js_cmd/navBtns-cmd"),
      $eles = {},
      eles = {};

   //2-Vue实例化 
    var vm = new Vue({
      data: {},
      methods: {}
    });

  //3- 页面初始化函数

    function initPage() {
      vm.$mount('#vue_hooker');
      window.scroll(0,0);
    }
  //4- 验证码相关处理函数
    function license(){
      $('.info4 .business-license').click(function (ev) { //弹层
        $('.btn_mes_text').val("");
        $('.arrow_mask').show();
        $('.arrow').show();
        $('#nav_omit').remove();
      });
      $('#btn_sku_dialog_close').click(function(ev){//弹窗
        $('.arrow_mask').hide();
        $('.arrow').hide();
        $('.btn_mes_text').val("");
      });

      $('.btn_mes_text').focus(function(){ //输入框获得焦点
        $('.btn_mes_text').val("");
        if($('.verification-code').length!=0){
          $('.verification-code').remove();
        }
      });
      $('.license-submit').click(function(){
        APP.verifyPicCode();
      });

    }

    //5- 验证码初始化函数（） TSOCapObj是腾讯接口里面的方法

    function verify_initPage(){
      $('#J_BtnVerifyPicCodeTencent').on('click', function () {
        TSOCapObj.refresh();
      });
      //初始化，参数传入显示验证码的元素imgid
      TSOCapObj.init("J_BtnVerifyPicCodeTencent");
      //刷新拉取验证码图片
      TSOCapObj.refresh();

      APP.verifyPicCode= function(fn) {
        //获取用户输入
        var ans = $(".btn_mes_text").val();
        //验证答案，验证完成后会回调第二个参数传入的函数
        TSOCapObj.verify(ans , function(ret_json){
          if (ret_json.errorCode!=0) {
            $(".btn_mes_text").val("");
            TSOCapObj.refresh();
            //tip("图形验证码输入错误！");
            if($('.verification-code').length==0){
              $('.btn_mes').eq(0).append(" <div class='verification-code'>请输入正确的验证码</div>");
            }
            $('.btn_mes_text').blur(function(){
              $('.btn_mes_text').text("");
            });
          } else {
            window.location="/buyer/vshop/license?aid=" + APP.aid;
            fn(ret_json.ticket);
          }
        });
      }
    }

     //6- 页面初始化函数的执行
    $(function () {
      initPage();
      license();
      verify_initPage();
    });

  });

  @import url(common.css);

  .div-section-info .info4{padding: 0}
  .div-section-info .info4 li{
    padding: 11px 14px;
    line-height: 20px;
    border-bottom: 1px solid #e6e6e6;

  }
  .div-section-info .info4 li a{
    color: #333;

    display: block;
  }
  .div-section-info .info4 li a.tel{
    background: url(/imgs/vshop/callAndMsg.png) no-repeat;  
    background-size: 20px 60px;
     background-position: right 0;
  }
  .div-section-info .info4 li a.webim{
    background: url(/imgs/vshop/callAndMsg.png) no-repeat;  
    background-size: 20px 60px;
    background-position: right -30px;
  }
  .div-section-info .info4 li a label{ 
    display: block;
    float: right;
  }

  .div-section-info .info4 li a label span{ 
    display: block;
    width: 12px;
    height: 12px;
    border-right:1px solid #666;
    border-bottom:1px solid #666;
    -webkit-transform:rotate(-45deg);
    float: right;
    margin-top: 4px;

  }
  .arrow_mask {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    z-index: 101;
    display: none;
    background: black;
    opacity: 0.7;
  }
  .arrow{
    width: 250px;
    height: 226px;
    background-color: #FFFFFF;
    position: fixed;
    top: 50%;
    left: 50%;
    z-index: 102;
    -webkit-transform: translate(-50%, -50%);
    -moz-transform: translate(-50%, -50%);
    -ms-transform: translate(-50%, -50%);
    -o-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
    border-radius: 10px;
    display: none;
  }
  .arrow-mess li:nth-of-type(1){
    text-align: center;
    margin-bottom: 8px;
    font-size: 14px;
    color: #333333;
  }
  .arrow-mess li:nth-of-type(2){
    text-align: center;
    margin-bottom: 10px;
  }
  .arrow-mess li:nth-of-type(3) input{
    width: 100%;
    height: 30px;
    border: 1px solid #979797;
    text-align: center;
    border-radius: 3px;
    font-family: PingFangSC-Regular;
    font-size: 16px;
    color: #333333;
    letter-spacing: 0px;
  }
  .btn_mes{
    margin-bottom: 15px;
    width: 100%;
    padding-left: 48px;
    padding-right: 48px;
    position: relative;
  }
  .btn_mes2{
    width: 100%;
    padding-left: 70px;
    padding-right: 70px;
    /* position: relative; */
    position: absolute;
    bottom: 0px;
    margin-bottom: 10px;
  }

  .license-submit{
    width: 100%;
    height: 44px;
    background: #FF534C;
    border: 1px solid #FF534C;
    font-size: 14px;
    border-radius: 4px;
    color: #FFFFFF;
  }

  .sku-close {
    background: url(/imgs/vshop/verification-code-del.png) no-repeat right;
    -webkit-background-size: 25px auto;
    display: inline-block;
    width: 26px;
    height: 26px;
    position: absolute;
    right: 0px;
    top: 0px;
    margin-right: -13px;
    margin-top: -13px;
  }
  .verification-code{
    z-index: 102;
    color: #FFAA00;
    position: absolute;
    font-size: 12px;
    top: 4px;
  }
  .verification-code-back{
    width: 100%;
    position: absolute;
    height: 46px;
  }
  .arrow div:nth-of-type(1){
    position: relative;
  }
  .arrow-mess{
    margin-top: 52px;
  }