废话不多说先来张效果图吧：

 这样效果实现的思路是，让这个动态加载元素绑定一个数组，通过修改数组中的元素来实现动态的添加元素效果：

好了主要的前端代码如下：

  <el-form-item label="上次所提议题" >
              <!-- 渲染问题列表 -->
              <section v-for="(value, index) in conforderform.lastquestions" :key="index">
                <section v-if="index === 0">
                  <el-row>
                    <el-col :span="15">
                      <el-input v-model="conforderform.lastquestions[index]" placeholder="请输入上次所提议题" clearable @keyup.enter.native="addlastitems(index, '1')"/>
                    </el-col>
                    <el-col :span="4">
                      <el-button type="primary" icon="el-icon-plus" plain style="margin-left:10px;" circle @click="addlastitems(index, '1')"/>
                    </el-col>
                  </el-row>
                </section>
                <section v-if="index > 0">
                  <!-- 添加的子项目 -->
                  <el-row style="margin-top:10px;">
                    <el-col :span="15">
                      <el-input v-model="conforderform.lastquestions[index]" placeholder="请输入上次所提议题" clearable @keyup.enter.native="addlastitems(index, '1')"/>
                    </el-col>
                    <el-col :span="4">
                      <el-button type="danger" icon="el-icon-delete" plain style="margin-left:10px;" circle @click="rmlastitems(index, '1')"/>
                    </el-col>
                  </el-row>
                </section>
              </section>
            </el-form-item>



// 会议预约提交表单
      conforderform: {
        confname: '', // 会议名称
        conflevel: '', // 会议级别
        confattrs: [], // 会议属性
        startdate: '', // 会议开始日期
        starttime: '', // 会议开始时间
        enddate: '', // 会议结束日期
        endtime: '', // 会议结束时间
        lastquestions: [''], // 上次所提议题
        curquesttions: [''], // 待解决的问题
        suggestions: [''] // 建议解决的方案
      },

// 添加上次所提议题
    addlastitems(index, type) {
      if (type === '1') {
        const lastitem = this.conforderform.lastquestions[this.conforderform.lastquestions.length - 1]
        if (lastitem.trim() === '') {
          this.$message.error('请您填写完一项后继续追加')
        } else {
          this.conforderform.lastquestions.push('')
        }
      } else if (type === '2') {
        const lastitem = this.conforderform.curquesttions[this.conforderform.curquesttions.length - 1]
        if (lastitem.trim() === '') {
          this.$message.error('请您填写完一项后继续追加')
        } else {
          this.conforderform.curquesttions.push('')
        }
      } else if (type === '3') {
        const lastitem = this.conforderform.suggestions[this.conforderform.suggestions.length - 1]
        if (lastitem.trim() === '') {
          this.$message.error('请您填写完一项后继续追加')
        } else {
          this.conforderform.suggestions.push('')
        }
      }
    },
    rmlastitems(index, type) {
      switch (type) {
        case '1':
          this.conforderform.lastquestions.splice(index, 1)
          break
        case '2':
          this.conforderform.curquesttions.splice(index, 1)
          break
        case '3':
          this.conforderform.suggestions.splice(index, 1)
          break
        default:
          break
      }
      this.$message.success('移除成功')
    }