<div v-for="item in singledLists" :key="item.index" >   // 数组singledLists

            <Checkbox @on-change="checkSingle" :disabled="isDisabled" v-model="item.isRight" class="mb10" >

                <Input  :value="item.content" v-model="item.content" style="width: 300px;marginLeft:.4rem;" />   // item.content 动态设置input

            </Checkbox>

            <span style="cursor:pointer;" @click="moveUp(item)">上移</span>

            <span style="cursor:pointer;" @click="moveDown(item)">下移</span>

            <span style="cursor:pointer;" @click="singleAnswerDelete(item)">删除</span>

</div>

<div class="ml30"><Button class='newColor' @click="addSingleAnswer" :class="{'hideButton':isShow}" type="primary">添加选项</Button></div>  // hideButton{dispaly:none} 控制显示和隐藏 ,isShow:false ;

// 添加答案选项

        addSingleAnswer() {

          let _this = this;

          _this.singledLists.push({});   // 置空

          if (_this.questionStyle === "single") {

            if (_this.singledLists.length >= 4) {

              _this.isShow = true; //隐藏按钮添加选项

              _this.$Message.info("单选题最多添加四个选项！");

            }

          } else if (_this.questionStyle === "multi") {

            if (_this.singledLists.length >= 6) {

              _this.isShow = true; //隐藏按钮添加选项

              _this.$Message.info("多选题最多添加六个选项！");

            }

          }

        },

// 以B为基点上移 (根据index值)
    moveUp(item) {

          console.log(item)

          console.log(this.singledLists)

          let index = this.singledLists.indexOf(item);  // 获取的index。或者通过v-for 遍历传过的index，可以简化此步骤。

          if (this.singledLists.length > 1 && index !== 0) {

            var temp = this.singledLists[index - 1].content;      // 这三行的含义可见上面示意图

            this.singledLists[index - 1].content = this.singledLists[index].content;

            this.singledLists[index].content = temp;

          }

     },

// 下移

        moveDown(item) {

          let index = this.singledLists.indexOf(item);

          if( this.singledLists.length > 1 && index != this.singledLists.length - 1 ) {

            var temp = this.singledLists[index + 1].content;     // 以c为基点

            this.singledLists[index + 1].content = this.singledLists[index].content;

            this.singledLists[index].content = temp;

          }

        },

        // 删除

        singleAnswerDelete(item) {

          this.isShow = false;

          let index = this.singledLists.indexOf(item);

          if (index > -1) {

            this.singledLists.splice(index, 1);

          }

        },