页面无法加载CSS样式

写了一个简单的登录页面，可是为什么加载不了外部CSS样式呢？可有人知道原因？ 程序代码： package main import ( "fmt" "html/template" "net/http" "strings" "log" _ "github.com/go-sql-driver/mysql" "database/sql" ) type WebMux struct{ } func (p *WebMux) ServeHTTP(w http.ResponseWriter,r *http.Request){ switch r.URL.Path{ case "/": sayHello(w,r) return case "/login": login(w,r) return default: http.NotFound(w,r) return } } func checkErr(err error) { if err != nil { panic(err) } } func sayHello(w http.ResponseWriter,r *http.Request){ r.ParseForm() fmt.Println(r.Form) fmt.Println("path:",r.URL.Path) fmt.Println("scheme:",r.URL.Scheme) fmt.Println(r.Form["url_long"]) for k,v:=range r.Form{ fmt.Println("key:",k) fmt.Println("val:",strings.Join(v," ")) } fmt.Fprintf(w,"Hello,welcome to Go web world!") } func login(w http.ResponseWriter,r *http.Request){ fmt.Println("method:",r.Method) if r.Method=="GET" { t,_:=template.ParseFiles("gtpl/login.html") t.Execute(w,nil) } else { r.ParseForm() fmt.Println("username:",r.Form["username"][0]) fmt.Println("password:",r.Form["password"][0]) //连接数据库 dbConnStr:="xoops:xoops@tcp(dbserver:3306)/xoops?charset=utf8" db,err:=sql.Open("mysql",dbConnStr) defer db.Close() rows,err:=db.Query("select * from auth_user where password=? and username=?",r.Form["password"][0],r.Form["username"][0]) checkErr(err) if rows.Next() { var username,password,usercnname string rows.Scan(&username,&password,&usercnname) fmt.Fprintf(w,"Hello,%s",usercnname) } else { fmt.Fprintf(w,"Ooooops!Invalid username or password.") } } } func main(){ //http.HandleFunc("/",sayHello) //err:=http.ListenAndServe(":9090",nil) mux:=&WebMux{} err:=http.ListenAndServe(":9090",mux) if err!=nil { log.Fatal("ListenAndServe:",err) } } login.html页面上使用<link rel="stylesheet" type="text/css" href="login.css"/>外联样式表 可是程序执行时不会加载样式。