1.在utils文件夹下新建一个directives.js文件（命名自己随意）
utlis.png
2.实现鼠标拖拽滑动图片的directives.js内容为
const dragscroll = (el) => {
el.onmousedown = ev => {
const disX = ev.clientX;
const disY = ev.clientY; // 需要上下移动可以加
const originalScrollLeft = el.scrollLeft;
const originalScrollTop = el.scrollTop; // 需要上下移动可以加
const originalScrollBehavior = el.style['scroll-behavior'];
const originalPointerEvents = el.style['pointer-events'];
el.style['scroll-behavior'] = 'auto';
// 鼠标移动事件是监听的整个document，这样可以使鼠标能够在元素外部移动的时候也能实现拖动
document.onmousemove = dv => {
dv.preventDefault();
const distanceX = dv.clientX - disX;
const distanceY = dv.clientY - disY; // 需要上下移动可以加
el.scrollTo(originalScrollLeft - distanceX, originalScrollTop - distanceY); // 需要上下移动和左右移动
// el.scrollTo(originalScrollLeft - distanceX, 0); // 不需要上下拖拽，y轴值为0
};
document.onmouseup = () => {
document.onmousemove = null;
document.onmouseup = null;
el.style['scroll-behavior'] = originalScrollBehavior;
el.style['pointer-events'] = originalPointerEvents;
};
};
};
export default dragscroll;
3.在main.js中注册全局指令
import dragscroll from '@/utils/directives.js'; // 引入鼠标拖拽滚动图片指令文件
// 注册鼠标拖拽滚动图片指令
Vue.directive('dragscroll', dragscroll);
4.最后在组件中使用
<div v-dragscroll><img /></div>
