【京东跳转方法】： 
let path= "/pages/union/proxy/proxy?spreadUrl=" + encodeURIComponent(jdUrl);
wx.navigateToMiniProgram({
  appId: “wx91d27dbf599dff74”,
  path: path,
  envVersion: 'release',
  success(res) {
      // 打开成功
    console.log(res);
  }
})

如何跳转到拼多多商品详情页面