func main() {
    app := iris.Default()

    // Query string parameters are parsed using the existing underlying request object.
    // The request responds to a url matching:  /welcome?firstname=Jane&lastname=Doe
    app.Get("/welcome", func(ctx iris.Context) {
        firstname := ctx.URLParamDefault("firstname", "Guest")
        lastname := ctx.URLParam("lastname") // shortcut for ctx.Request().URL.Query().Get("lastname")

        ctx.Writef("Hello %s %s", firstname, lastname)
    })
    app.Listen(":8080")
}

以上代码中我们可以在http://localhost:8080/welcome后跟上query参数来修改页面数据，例如