vue-cli项目中用vue自定义指令实现鼠标拖拽左滑右滑动图片

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

参考文章
(https://haofly.net/vue-dragscroll/)