vue 实现在同一界面实现组件的动态添加和删除功

//所有要显示的子组件，写在一个li标签，有 v-for循环。
  <li v-for="(item, index) in questionList" v-bind:key="index">
          <el-row :gutter="20">
            <el-col offset="2" :span="4">
              <el-select
                size="small"
                v-model="chooseValue"
                multiple
                placeholdr="请选择试题类型"
                style="width:200px;margin-left:-40px"
              >
                <el-option :value="item.mineStatusValue" style="height:auto">
                  <el-tree
                    :data="data"
                    node-key="id"
                    :props="defaultProps"
                    @node-click="handleNodeClick"
                  ></el-tree>
                </el-option>
              </el-select>
            </el-col>
            <el-col offset="3" :span="3">
              <el-select
                style="margin-left:-30px"
                size="small"
                v-model="item.value"
                placeholder="请选择">
                <el-option
                  v-for="item in questionoptions"
                  :key="item.value"
                  :label="item.label"
                  :value="item.value"
                ></el-option>
              </el-select>
            </el-col>
            <el-col offset="2" :span="4">
              <el-input style="width:45px;" size="small" v-model="count">
                {{ item.count }}
              </el-input>
              <label>&nbsp;/0&nbsp;</label>
            </el-col>
            <el-col :span="6">
              <el-input style="width:45px;" size="small" v-model="sourcess">
                {{ item.sourcess }}
              </el-input>
              <label>&nbsp;&nbsp;</label>
              <!-- 在i标签设置删除按钮，运用splice函数。 -->
              <i class="el-icon-remove-outline"
                style="margin-left:20px"
                @click="questionList.splice(index, 1)"
              ></i>

//添加试题，组件循环显示
    addQuestion() {
      console.log("添加试题");
      this.questionList.unshift({
        mineStatusValue: this.mineStatusValue,
        questionoptions: this.questionoptions,
        count: this.count,
        sourcess: this.sourcess,
      });
    },

<i class="el-icon-remove-outline"
  style="margin-left:20px"
  @click="questionList.splice(index, 1)">
</i>