使用@media查询可以在浏览器中响应网站，但在移动设备上只会打开完整的桌面版本

I know this question has been asked before, but all suggested answers have not worked for me. I am trying to make a responsive website, and while it works just fine in the browser (when I resize it), when I open the website on my mobile device I only get the full desktop version.I know this question has been asked before, but