https://developers.weixin.qq.com/miniprogram/dev/component/web-view.html

<script src="https://res.wx.qq.com/open/js/jweixin-1.3.2.js#wechat_redirect"></script>

npm i -S weixin-js-sdk

import wx from 'weixin-js-sdk';

//关闭浏览器（微信内置浏览器私有接口）
WeixinJSBridge.call('closeWindow');
//返回小程序页面
wx.miniProgram.navigateTo({
      url: '/pages/ad/index'
})