主要代码如下：

<template>
    <div id="test_3">
        <img src="../assets/img/photo.jpg" @mousedown="start" @mouseup="stop" @mousemove="move" :style="style">
    </div>
</template>

<script>
    export default{
        data:function(){
            return{
                canDrag: false,
                x0:0,
                y0:0,
                x1:0,
                y1:0,
                style:null
            }
        },
        methods:{
            start:function(e){
                //鼠标左键点击
                if(e.button==0){
                    this.canDrag=true;
                    //记录鼠标指针位置
                    this.x0=e.clientX;
                    this.y0=e.clientY;
                }
            },
            stop:function(e){
                this.canDrag=false;
            },
            move:function(){
                if(this.canDrag==true){
                    this.x1=e.clientX;
                    this.y1=e.clientX;

                    let x=this.x1-this.x0;
                    let y=this.y1-this.y0;

                    let img=document.querySelector("#test_3 img");
                    this.style=`left:${img.offsetLeft+x}px;top:${img.offsetTop+y}px`;
                    this.x0=this.x1;
                    this.y0=this.y1;
                }
            }
        }
    }
</script>