vue.draggable handle 鼠标在指定元素上才允许拖动

当鼠标落在handle指定的元素上面时才允许拖动，如下面的例子只能点击加号区域才能拖动，点击其他区域则无法拖动。

handle属性

<draggable v-model="arr1"  handle=".mover"  animation="300">
   <transition-group>
       <div class="item" v-for="item in arr1" :key="item.id">{{item.name}}</div>
   </transition-group>
 </draggable>

例子

完整代码

<template>
  <div> 
<!--使用draggable组件-->
<div class="itxst">
<div class="col">
 <draggable v-model="arr1"  handle=".mover"  animation="300"  @start="onStart" @end="onEnd">
    <transition-group>
     <div class="item" v-for="item in arr1" :key="item.id"><span class="mover">+</span>{{item.name}}</div>
    </transition-group>
</draggable> 
 </div>
  </div>
  </div>
</template>
<script>
//导入draggable组件
import draggable from 'vuedraggable'
export default {
  //注册draggable组件
  components: {
            draggable,
        },
  data() {
    return { 
      disabled:false,
      //定义要被拖拽对象的数组
      arr1:[
        {id:1,name:'www.itxst.com'},
        {id:2,name:'www.jd.com'},
        {id:3,name:'www.baidu.com'},
        {id:4,name:'www.taobao.com'}
        ] 
    };
  },
  methods: {
     //设置禁止拖拽
      setJY(){
        this.disabled=true;
      },
      //设置启用拖拽
      setQY(){
        this.disabled=false;
      },
       onStart(){
        this.drag=true;
      },
     //开始拖拽事件
      onStart(){
        this.drag=true;
      },
      //拖拽结束事件
       onEnd() {
       this.drag=false;
    },
  },
};
</script>
<style scoped>
  /*定义要拖拽元素的样式*/
      .itxst {
          margin: 10px;
      }
      .col {
          width: 80%;
          flex: 1;
          padding: 10px;
          border: solid 1px #eee;
          border-radius: 5px;
          float: left;
      }
      .col + .col {
          margin-left: 10px;
      }
      .item {
          padding: 6px 12px;
          margin: 0px 10px 0px 10px;
          border: solid 1px #eee;
          background-color: #f1f1f1;
          text-align: left;
      }
      .item + .item {
          border-top: none;
          margin-top: 6px;
      }
      .mover {
          background-color: #fdfdfd;
          cursor: move;
          padding:3px 6px;
      }
</style>