bug: fix url multi code

src/util/util.js

   },
   getCode: (appid) => {
     wechatConfig.appid = appid
-    let url = `https://open.weixin.qq.com/connect/oauth2/authorize?appid=${appid}&redirect_uri=${encodeURIComponent(window.location.href)}&response_type=${wechatConfig.response_type}&scope=${wechatConfig.scope}&state=${wechatConfig.state}#wechat_redirect`
+    const refer = window.encodeURIComponent(window.location.href.replace(/code=[^?&=]+/, '').replace(/state=[^?&=]+/, '').replace('?&', '?'))
+    let url = `https://open.weixin.qq.com/connect/oauth2/authorize?appid=${appid}&redirect_uri=${refer}&response_type=${wechatConfig.response_type}&scope=${wechatConfig.scope}&state=${wechatConfig.state}#wechat_redirect`
     window.location.href = url
   },
   upload (item) {