Vue.directive('drag', {
  //1.指令綁定到元素上回立刻執(zhí)行bind函數(shù)，只執(zhí)行一次
  //2.每個函數(shù)中第一個參數(shù)永遠(yuǎn)是el，表示綁定指令的元素，el參數(shù)是原生js對象
  //3.通過el.focus()是無法獲取焦點的，因為只有插入DOM后才生效
  bind: function (el) { },
  //inserted表示一個元素，插入到DOM中會執(zhí)行inserted函數(shù)，只觸發(fā)一次
  inserted: function (el) {
    let odiv = el; //獲取當(dāng)前元素
    let firstTime = '', lastTime = '';
    el.onmousedown = function (e) {
      var disx = e.pageX - el.offsetLeft;
      var disy = e.pageY - el.offsetTop;
      // 給當(dāng)前元素添加屬性，用于元素狀態(tài)的判斷
      odiv.setAttribute('ele-flag', false)
      odiv.setAttribute('draging-flag', true)
      firstTime = new Date().getTime();
      document.onmousemove = function (e) {
        el.style.left = e.pageX - disx + 'px';
        el.style.top = e.pageY - disy + 'px';
      }
      document.onmouseup = function (event) {
        document.onmousemove = document.onmouseup = null;
        lastTime = new Date().getTime();
        if ((lastTime - firstTime) > 200) {
          odiv.setAttribute('ele-flag', true)
          event.stopPropagation()
        }
        setTimeout(function () {
          odiv.setAttribute('draging-flag', false)
        }, 100)
      }
    }
  }
})

<template>
	<div class="drag" v-drag @click="handleDragClick"> 我是拖拽的div<div>
<template>
<script>

methods:{
  handleDragClick(e){
  // 判斷拖拽組件的狀態(tài)
	let isDrag = false;
	try {
      isDrag = e.target.getAttribute('ele-flag') === 'true';
	}catch (e) {
		}
	if(isDrag){
		return;
     }
	 // 當(dāng)推拽組件未在 拖動狀態(tài) 執(zhí)行點擊事件
	 // todo 下面是執(zhí)行點擊事件的代碼
   }
}
</script>
<style>
// 這里是拖拽 組件的樣式
.drag{
  width:100px;
  height:100px;
  border:1px solid pink;
}
</style>

<template>
  <div class="drag" v-drag ref="drag"></div>
</template>

<script>
export default {
  name: 'Home',
  data(){
    return{
      positionX:'',
      positionY:''
    }
  },
  mounted () {
    this.$refs.drag.style.top = window.localStorage.getItem('top')+'px'
    this.$refs.drag.style.left = window.localStorage.getItem('left')+'px'
  },
  directives: {
    drag: {
      // 指令的定義
      bind: function (el,binding,vnode) {
        console.log(el);
        console.log(binding);
        console.log(vnode.context);
        let odiv = el;  //獲取當(dāng)前元素
        odiv.onmousedown = (e) => {
          //算出鼠標(biāo)相對元素的位置
          let disX = e.clientX - odiv.offsetLeft;
          let disY = e.clientY - odiv.offsetTop;
           
          document.onmousemove = (e)=>{
            //用鼠標(biāo)的位置減去鼠標(biāo)相對元素的位置，得到元素的位置
            let left = e.clientX - disX;  
            let top = e.clientY - disY;
            
            //綁定元素位置到positionX和positionY上面
            vnode.context.positionX = top;
            vnode.context.positionY = left;

            window.localStorage.setItem('top',top)
            window.localStorage.setItem('left',left)
         
            //移動當(dāng)前元素
            odiv.style.left = left + 'px';
            odiv.style.top = top + 'px';
          };
          document.onmouseup = () => {
            document.onmousemove = null;
            document.onmouseup = null;
          };
        };
      }
    }
  }
}
</script>
<style lang="scss" scoped>
.drag{
  position: relative;   /*定位*/
  // top: 10px;
  // left: 10px;
  width: 200px;
  height: 200px;
  background: #666;    /*設(shè)置一下背景*/
}
</style>