Theme switching problem, after using someone else's webapp to switch the template theme in the background, the mobile phone will switch to the theme when opening the web page.

Theme switching problem. I have used other people’s webapps to switch the template theme in the background. After opening the webpage on the mobile phone, the theme is switched to. My company made one. As a result, WeChat has a cache and the effect of the switch cannot be seen immediately. I can only speak WeChat. After logging out and logging in again, you can see that the theme has been switched. How can you see the theme in real time when switching templates when there is cache?