小程序是否有类似于路由拦截的功能，我做登录的时候发现很费力

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流程： 前端请求后台接口，后台重定向到https://open.weixin.qq.com/connect/oauth2/authorize?appid=wxc7290663e60b3a23&redirect_uri=http%3A%2F%2Fantare.fun%2Fweixin%2Fauth&response_type=code&scope=snsapi_userinfo&connect_redirect=1&state=STATE#wechat_redirect 之后前端会报跨域问题： Access to XMLHttpRequest at 'https://open.weixin.qq.com/connect/oauth2/authorize?appid=wxc7290663e60b3a23&redirect_uri=http%3A%2F%2Fantare.fun%2Fweixin%2Fauth&response_type=code&scope=snsapi_userinfo&connect_redirect=1&state=STATE#wechat_redirect' (redirected from 'http://antare.fun/weixin/login') from origin 'null' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

https://developers.weixin.qq.com/doc/offiaccount/Basic_Information/Get_access_token.html 设置了ip白名单但是仍然报错[图片]

期望：     onTabItemTap内执行A操作     onShow内执行B操作     期望执行的顺序是 A -> B 问题：发现onTabItemTap的触发是在onShow之后，会变成 B -> A 尝试解决：     不过这样是否能保证 A -> B 的执行顺序呢？ [代码]Page({[代码][代码]    [代码][代码]onTabItemTap() {[代码][代码]        [代码][代码]// 执行A操作[代码][代码]    [代码][代码]},[代码][代码]    [代码][代码]onShow() {[代码][代码]        [代码][代码]setTimeout(() => {[代码][代码]             [代码][代码]// 执行B操作    [代码][代码]        [代码][代码]}, 10)  [代码][代码]    [代码][代码]}[代码][代码]})[代码]