8-13節 如果寫2個，就只顯示 瀏覽器:xxx 所以我就只好寫了1個 documen.write document.write("瀏覽器:"+B_name+"<br>"); document.write("u_agent:"+u_agent+"<br>"); function validB(){ var u_agent = navigator.userAgent;if( ... }else if(...} document.write("瀏覽器:"+B_name+"<br>"); document.write("u_agent:"+u_agent+"<br>"); }