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拖动的元素在鼠标按下时通过时间差给元素添加一个属性（drag-flag），若超过规定时间则认为是在拖拽，属性设置为true，否则设置为false。点击方法中通过获取这个属性判断是否要执行点击后的指令。

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<div ref="cellBtn" class="cell-btn" :draggable="true" @mousedown.stop="moveBtn" @click.stop="showDialog">
    <img src="1.png"/>
    <span>悬浮按钮</span>
</div>
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showDialog(){
    const drag = this.$refs.cellBtn.getAttribute('drag-flag')
    if (drag==='false') {        
       // todo
    }
},
moveBtn(e) { // 拖拽监听鼠标按下
    const draggableIcon = this.$refs.cellBtn;
    if (!draggableIcon) return;
    draggableIcon.setAttribute('drag-flag', false); 

    let lastX, lastY
    if (this.varCallFrom.state!==0) {
        lastX = e.clientX - draggableIcon.offsetLeft
    }        
    lastY = e.clientY - draggableIcon.offsetTop

    const start = new Date().getTime();
    document.onmousemove = () => {
        const end = new Date().getTime();
        if (end - start > 200) {
            draggableIcon.setAttribute('drag-flag', true); 
        }
    }
    // 鼠标移动计算
    const moveFun = (e2) => {
        e2.preventDefault();
        const newX = e2.clientX - lastX
        const newY = e2.clientY - lastY

        draggableIcon.style.left = `${newX}px`
        draggableIcon.style.top = `${newY}px`
    }

    // 取消计算绑定
    const stopFun = () => {
        draggableIcon.removeEventListener('mousemove', moveFun);
        draggableIcon.removeEventListener('mouseup', stopFun);
    }

    draggableIcon.addEventListener('mousemove', moveFun); // 添加监听事件，鼠标开始移动
    draggableIcon.addEventListener('mouseup', stopFun); // 添加监听事件，鼠标停止移动
},
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.cell-btn{
  position: fixed;
  right: 50px;
  bottom: 25px;
  z-index: 101;
  background: #30314C;
  box-shadow: 0px 2px 12px 0px rgba(67,61,142,0.5);
  border-radius: 50%;
  color: #fff;
  display: flex;
  flex-direction: column;
  justify-content: center;
  font-size: 14px;
  height: 80px;
  width: 80px;
  text-align: center;
  cursor: pointer;

  img {
    height: 30px;
    width: 30px;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: 6px;
  }
}