1.新建share.js文件

const util = require('./util.js')
export default {
  data() {
    return {
      // 设置默认的分享参数
      // 如果页面不设置share，就触发这个默认的分享
      share: {
        title: '', // 自定义标题
        path: `/pages/index/index`, // 默认跳转首页
        imageUrl: '' // 可设置默认分享图，不设置默认截取头部5:4
      }
    }
  },
  onShareAppMessage(res) { // 发送给朋友
    console.log('------------------onShareAppMessage------------------')
    const that = this
    // 动态获取当前页面栈
    const pageInfos = util.getCurrentPageInfo() || {}
    let fullPath = pageInfos.fullPath
    if (!fullPath.includes('channelSource')) {
      fullPath = fullPath.includes('?') ? `${fullPath}&channelSource=${util.getChannelSource()}` : `${fullPath}?channelSource=${util.getChannelSource()}`
    }
    console.log('---------pageInfos-------------', pageInfos)
    console.log('---------fullPath-------------', fullPath)
    that.share.path = `${fullPath}`
    return {
      title: this.share.title,
      path: this.share.path,
      imageUrl: this.share.imageUrl,
      success(res) {
        console.log('success(res)==', res)
        setTimeout(() => {
          uni.showToast({
            title: `分享成功`,
            duration: 2000,
            icon: 'none'
          })
        }, 0)
      },
      fail(res) {
        console.log('fail(res)==', res)
        setTimeout(() => {
          uni.showToast({
            title: `分享失败`,
            duration: 2000,
            icon: 'none'
          })
        }, 0)
      }
    }
  },
  onShareTimeline(res) { // 分享到朋友圈
    const that = this
    // 动态获取当前页面栈
    const pageInfos = util.getCurrentPageInfo() || {}
    const fullPath = pageInfos.fullPath
    that.share.path = `${fullPath}`
    return {
      title: this.share.title,
      path: this.share.path,
      imageUrl: this.share.imageUrl,
      success(res) {
        console.log('success(res)==', res)
        setTimeout(() => {
          uni.showToast({
            title: `分享成功`,
            duration: 2000,
            icon: 'none'
          })
        }, 0)
      },
      fail(res) {
        console.log('fail(res)==', res)
        setTimeout(() => {
          uni.showToast({
            title: `分享失败`,
            duration: 2000,
            icon: 'none'
          })
        }, 0)
      }
    }
  }
}

2.util.js文件中新增方法

/**
 * 获取当前页路由及其当前页url query参数
 * 兼容微信小程序及H5
 */
const getCurrentPageInfo = () => {
  const routes = getCurrentPages() // 获取当前打开过的页面路由数组
  const curRoute = routes[routes.length - 1].route // 获取当前页面路由
  // 在微信小程序或是app中，通过curPage.options
  // 如果是H5，则需要curPage.$route.query（H5中的curPage.options为undefined)
  const fullPath = routes[routes.length - 1].$page.fullPath
  const curParam = routes[routes.length - 1].options || routes[routes.length - 1].$route.query // 获取路由参数
  return { fullPath, curRoute, routes, curQuery: curParam }
}

3.main.js引入并使用

// 全局分享
// 小程序分享的封装
import share from './utils/share.js'
Vue.mixin(share)

4.支持在页面中重写"onShareAppMessage"生命周期

如果您基于自己的一些业务逻辑，需要更加自定义的实现逻辑，可以在页面中重写onShareAppMessage生命周期即可覆盖通过mixin监听的onShareAppMessage生命周期。