JS simple code determines whether the device that opens the page is the PC end of the computer, the H5 end of the mobile phone, or the wechat end

//  First judge whether the wechat terminal is opened 
if (/(micromessenger)/i.test(navigator.userAgent)) {
    
        alert(" WeChat ");
      } else {
    
        alert(" Normal browser ");
        //  Judge h5 still pc
        let client =
          /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(
            navigator.userAgent
          );
        if (client) {
    
          alert("h5");

        } else {
    
          alert("pc");
        }
      }