html">  <el-dialog title="错误消息" :visible.sync="errorDialogVisible" width="30%" center>
      <span>导入积分发放账号报错了! 报错信息如下:</span>
      <div id="text" v-html="errorInfo"></div>
      <textarea id="input">这是幕后黑手</textarea>
      <p>
        手机号添加失败
      </p>
      <span slot="footer" class="dialog-footer">
        <el-button @click="errorDialogVisible = false">知道了</el-button>
        <el-button type="primary" @click="copyText()">复 制</el-button>
      </span>
    </el-dialog>

html" title=java>javascript">      errorInfo: {},

关键代码

html" title=java>javascript">          let newArray = res.dataObj.toString()
          this.errorInfo = newArray.replace(/\,/g, '</br>')  //逗号切割并换行
          this.errorDialogVisible = true

将变量errorInfo 赋给弹框 v-html展示就好了