移动端能正常返回，PC端小程序回退不了小程序页面，只能回退到webview的上个页面

    addExternalScript('https://res.wx.qq.com/open/js/jweixin-1.6.0.js')
      .then(() => {
        const wx = window.wx?.miniProgram;
        wx?.postMessage({
          data: {
            type: 'token'
            value: 'xxx',
          },
        });
        wx.miniProgram.navigateBack();
      })
      .catch(() => {
        console.error('Failed to load external script.');
      });
  }, []);