详解解决小程序中webview页面多层history返回问题

window.addEventListener('popstate', (event) => {
  wx.miniProgram.navigateBack();
});
const code = getSearch('code'); // 伪代码，获取查询参数
if (!code) { // 页面A1
  if (isWeixin()) {
    // 微信环境
    const redirectUrl = window.location.href + '&code=1';
    window.location.href = 'https://open.weixin.qq./connect/oauth2/authorize' + '?appid=' + appId +
    '&redirect_uri=' + encodeURIComponent(redirectUrl) +
    '&response_type=code&scope=snsapi_userinfo' +
    '#wechat_redirect'; // 静默授权伪代码
  } else {
    alert('当前不是微信环境');
  }
} else { // 页面A2
  history.pushState({page: 1}, null, window.location.href);
}