第一步：下载海康的js包，并在html中引入：

第二步：在相应的页面中开始编写，具体代码如下：

<template>
  <el-container>
    <el-aside width="300px">
      <el-tree
        node-key="id"
        :data="treeData"
        :props="defaultProps"
        style="min-height: 580px"
        @node-click="handleNodeClick"
      />
    </el-aside>
    <el-main>
      <div ref="playWndBox">
        <!-- 视频数据站位 -->
        <div
          id="playWnd"
          class="playWnd"
          :style="{
            height: playWndHeight + 'px',
            width: playWndWidth + 'px',
          }"
        />
      </div>
    </el-main>
  </el-container>
</template>
<script>
import { getVideoRegionTree, getVideoInfo } from "@/api/realTimeInformation";
export default {
  data() {
    return {
      treeData: [],
      defaultProps: {
        children: "children",
        label: "name",
      },
      // 视频盒子的高度
      playWndHeight: "",
      // 视频盒子的宽度
      playWndWidth: "",
      oWebControl: null,
      initCount: 0,
      pubKey: "",
      cameraIndexCode: "", // 监控点编号
      objData: {
        appkey: "24057559",
        ip: "172.16.100.77",
        port: 443,
        playMode: 0, // 0 预览 1回放
        layout: "2x2", //页面展示的模块数【16】
        secret: "wekC84ynkwyvLbNUnr20",
      },
    };
  },
  mounted() {
    this.getTreeList();
    // 首次加载时的到父容器的高度
    this.playWndHeight = this.$refs.playWndBox.clientHeight;
    // 首次加载时的到父容器的宽度
    this.playWndWidth = this.$refs.playWndBox.clientWidth - 140;
    // 初始化摄像头
    this.$nextTick(() => {
      this.initPlugin();
    });
    // 监听resize事件，使插件窗口尺寸跟随DIV窗口变化
    window.addEventListener("resize", () => {
      console.log(
        this.$refs.playWndBox.clientHeight,
        this.$refs.playWndBox.clientWidth
      );
      if (this.oWebControl != null) {
        this.oWebControl.JS_Resize(
          this.$refs.playWndBox.clientWidth - 140,
          this.$refs.playWndBox.clientHeight
        );
      }
    });
  },

  methods: {
    // 获取左侧树列表
    getTreeList() {
      getVideoRegionTree().then((res) => {
        this.treeData = res.data;
      });
    },
    handleNodeClick(data) {
      if (!data.children) {
        getVideoInfo({ videoId: data.id })
          .then((res) => {
            this.previewVideo(res.data);
          })
          .catch((err) => {
            console.log(err, "-------");
          });
      }
    },

    // 创建播放实例
    initPlugin() {
      let that = this;
      this.oWebControl = null;
      that.oWebControl = new WebControl({
        szPluginContainer: "playWnd", // 指定容器id
        iServicePortStart: 15900, // 指定起止端口号，建议使用该值
        iServicePortEnd: 15909,
        szClassId: "23BF3B0A-2C56-4D97-9C03-0CB103AA8F11", // 用于IE10使用ActiveX的clsid
        cbConnectSuccess: () => {
          // 创建WebControl实例成功
          that.oWebControl
            .JS_StartService("window", {
              // WebControl实例创建成功后需要启动服务
              // 值"./VideoPluginConnect.dll"写死
              dllPath: "./VideoPluginConnect.dll",
            })
            .then(
              function () {
                // 设置消息回调
                that.oWebControl.JS_SetWindowControlCallback({
                  cbIntegrationCallBack: that.cbIntegrationCallBack,
                });
                //JS_CreateWnd创建视频播放窗口，宽高可设定
                that.oWebControl
                  .JS_CreateWnd("playWnd", 1000, 600)
                  .then(function () {
                    // 创建播放实例成功后初始化
                    that.init();
                  });
              },
              function () {
                // 启动插件服务失败
              }
            );
        },
        // 创建WebControl实例失败
        cbConnectError: function () {
          that.oWebControl = null;
          that.$message.warning("插件未启动，正在尝试启动，请稍候...");
          // 程序未启动时执行error函数，采用wakeup来启动程序
          window.WebControl.JS_WakeUp("VideoWebPlugin://");
          that.initCount++;
          if (that.initCount < 3) {
            setTimeout(function () {
              that.initPlugin();
            }, 3000);
          } else {
            that.$message.warning("插件启动失败，请检查插件是否安装！");
          }
        },
        cbConnectClose: () => {
          // 异常断开：bNormalClose = false
          // JS_Disconnect正常断开：bNormalClose = true
          console.log("cbConnectClose");
          that.oWebControl = null;
        },
      });
    },
    // 初始化
    init(callback) {
      let that = this;
      that.getPubKey(() => {
        let appkey = that.objData.appkey; //综合安防管理平台提供的appkey，必填
        let secret = that.setEncrypt(that.objData.secret); //综合安防管理平台提供的secret，必填
        let ip = that.objData.ip; //综合安防管理平台IP地址，必填
        let playMode = that.objData.playMode; //初始播放模式：0-预览，1-回放
        let port = that.objData.port; //综合安防管理平台端口，若启用HTTPS协议，默认443
        let snapDir = "D:\\SnapDir"; //抓图存储路径
        let videoDir = "D:\\VideoDir"; //紧急录像或录像剪辑存储路径
        let layout = that.objData.layout; //playMode指定模式的布局
        let enableHTTPS = 1; //是否启用HTTPS协议与综合安防管理平台交互，这里总是填1
        let encryptedFields = "secret"; //加密字段，默认加密领域为secret
        let showToolbar = 1; //是否显示工具栏，0-不显示，非0-显示
        let showSmart = 1; //是否显示智能信息（如配置移动侦测后画面上的线框），0-不显示，非0-显示
        let buttonIDs =
          "0,16,256,257,258,259,260,512,513,514,515,516,517,768,769"; //自定义工具条按钮
        // var toolBarButtonIDs = "2049,2304" // 工具栏上自定义按钮
        that.oWebControl
          .JS_RequestInterface({
            funcName: "init",
            argument: JSON.stringify({
              appkey: appkey, //API网关提供的appkey
              secret: secret, //API网关提供的secret
              ip: ip, //API网关IP地址
              playMode: playMode, //播放模式（决定显示预览还是回放界面）
              port: port, //端口
              snapDir: snapDir, //抓图存储路径
              videoDir: videoDir, //紧急录像或录像剪辑存储路径
              layout: layout, //布局
              enableHTTPS: enableHTTPS, //是否启用HTTPS协议
              encryptedFields: encryptedFields, //加密字段
              showToolbar: showToolbar, //是否显示工具栏
              showSmart: showSmart, //是否显示智能信息
              buttonIDs, //自定义工具条按钮
            }),
          })
          .then(function (oData) {
            that.oWebControl.JS_Resize(that.playWndWidth, that.playWndHeight); // 初始化后resize一次，规避firefox下首次显示窗口后插件窗口未与DIV窗口重合问题
            if (callback) {
              callback();
            }
            // 隐藏
            // that.oWebControl.JS_HideWnd()
          });
      });
    },
    // 获取公钥
    getPubKey(callback) {
      let that = this;
      this.oWebControl
        .JS_RequestInterface({
          funcName: "getRSAPubKey",
          argument: JSON.stringify({
            keyLength: 1024,
          }),
        })
        .then(function (oData) {
          if (oData.responseMsg.data) {
            that.pubKey = oData.responseMsg.data;
            callback();
          }
        });
    },
    // RSA 加密
    setEncrypt(value) {
      let that = this;
      let encrypt = new window.JSEncrypt();
      encrypt.setPublicKey(that.pubKey);
      return encrypt.encrypt(value);
    },
    // 回调的消息
    cbIntegrationCallBack(oData) {
      let { responseMsg: type } = oData;
      if (type === "error") {
        console.log(
          type,
          type,
          this.dateFormat(new Date(), "yyyy-MM-dd hh:mm:ss")
        );
      } else {
        console.log(
          type,
          type,
          this.dateFormat(new Date(), "yyyy-MM-dd hh:mm:ss")
        );
      }
    },
    // 视频预览功能
    previewVideo(data) {
      let that = this;
      let cameraIndexCode = data.cameraIndexCode; // 获取输入的监控点编号值，必填
      let streamMode = 0; // 主子码流标识：0-主码流，1-子码流
      let transMode = 0; // 传输协议：0-UDP，1-TCP
      let gpuMode = 0; // 是否启用GPU硬解，0-不启用，1-启用
      let wndId = -1; // 播放窗口序号（在2x2以上布局下可指定播放窗口）
      console.log(cameraIndexCode, "-------cameraIndexCode-");

      that.oWebControl.JS_RequestInterface({
        funcName: "startPreview",
        argument: JSON.stringify({
          cameraIndexCode: cameraIndexCode.trim(), // 监控点编号
          streamMode: streamMode, // 主子码流标识
          transMode: transMode, // 传输协议
          gpuMode: gpuMode, // 是否开启GPU硬解
          wndId: wndId, // 可指定播放窗口
        }),
      });
    },
    // 停止全部预览
    stopAllPreview() {
      this.oWebControl.JS_RequestInterface({
        funcName: "stopAllPreview",
      });
    },
    // 格式化时间
    dateFormat(oDate, fmt) {
      let o = {
        "M+": oDate.getMonth() + 1, //月份
        "d+": oDate.getDate(), //日
        "h+": oDate.getHours(), //小时
        "m+": oDate.getMinutes(), //分
        "s+": oDate.getSeconds(), //秒
        "q+": Math.floor((oDate.getMonth() + 3) / 3), //季度
        S: oDate.getMilliseconds(), //毫秒
      };
      if (/(y+)/.test(fmt)) {
        fmt = fmt.replace(
          RegExp.$1,
          (oDate.getFullYear() + "").substr(4 - RegExp.$1.length)
        );
      }
      for (let k in o) {
        if (new RegExp("(" + k + ")").test(fmt)) {
          fmt = fmt.replace(
            RegExp.$1,
            RegExp.$1.length == 1
              ? o[k]
              : ("00" + o[k]).substr(("" + o[k]).length)
          );
        }
      }
      return fmt;
    },
  },
  // 组件销毁后
  destroyed() {
    if (this.oWebControl != null) {
      // 先让窗口隐藏，规避可能的插件窗口滞后于浏览器消失问题
      this.oWebControl.JS_HideWnd();
      // 销毁当前播放的视频
      this.oWebControl.JS_RequestInterface({ funcName: "destroyWnd" });
      // 断开与插件服务连接
      this.oWebControl.JS_Disconnect();
    }
  },
};
</script>

<style lang="scss" scoped>
.playWnd {
  margin: 30px 0 0 50px;
  width: 900px;
  height: 500px;
  border: 1px solid red;
}
.cbInfoDiv {
  float: left;
  width: 360px;
  margin-left: 16px;
  border: 1px solid #7f9db9;
}
.cbInfo {
  height: 200px;
  padding: 5px;
  border: 1px solid #7f9db9;
  word-break: break-all;
  overflow: scroll／auto;
}
.operate {
  margin-top: 24px;
}
.operate::after {
  content: "";
  display: block;
  clear: both;
}
.operate .btns {
  height: 32px;
}
.module {
  float: left;
  width: 120px;
  min-height: 290px;
  margin-left: 10px;
  padding: 16px 8px;
  box-sizing: border-box;
  border: 1px solid #e5e5e5;
}
.module .item {
  margin-bottom: 4px;
}
.module .label {
  width: 150px;
  display: inline-block;
  vertical-align: middle;
  margin-right: 8px;
  text-align: right;
}
.module input[type="text"],
.module select {
  box-sizing: border-box;
  display: inline-block;
  vertical-align: middle;
  margin-left: 0;
  width: 150px;
  min-height: 20px;
}
.module .btn {
  min-width: 80px;
  min-height: 24px;
  margin-top: 16px;
  margin-left: 158px;
}
.el-aside {
  margin: 0px;
  height: 84vh;
  color: #333;
  background-color: #d3dce6;
}
.el-main {
  background-color: #e9eef3;
  color: #333;
  text-align: center;
}
</style>

具体页面，其实可以看代码，就可以看的出来，左侧是一个树，右边是视频内容，通过点击不同的树节点，获取不同的视频的id,从而调取监控页面，这里需要下载海康的插件才可以查看，不然会提示无此插件