compiler-errors - Elm找不到Elm空白错误

Question

我不断收到空白编译器错误，但找不到错误。
这是错误

I need whitespace, but got stuck on what looks like a new declaration. You are either missing some stuff in the declaration above or just need to add some spaces here:

41| view : Model -> Html -> Msg ^ I am looking for one of the following things:

whitespace

这是代码

view : Model -> Html -> Msg
view model =
    div [] [
        h2 [] [text ("Counter: " ++ (toString model))]
        , button [type_ "button", onClick Add ] [text "add"]
        , button [type_ "button", onClick Sub ] [text "subtract"]
        , button [type_ "button", onClick Reset ] [text "reset"]
    ]

我必须错过一些非常简单的东西，但是我找不到它。

Answer 1

函数调用后需要一些空格。喜欢

x =
0

不会编译，但是

x =
    0

会编译，这样说。您需要像这样缩进div []

view : Model -> Html -> Msg
view model =
    div []
        [ h2 [] [ text ("Counter: " ++ (toString model)) ]
        , button [ type_ "button", onClick Add ] [ text "add" ]
        , button [ type_ "button", onClick Sub ] [ text "subtract" ]
        , button [ type_ "button", onClick Reset ] [ text "reset" ]
        ]

另外， View 的类型注释已关闭，当前您拥有

view : Model -> Html -> Msg

但这应该是

view : Model -> Html Msg

只是学习时的提示，您可以省略类型别名

--view : Model -> Html Msg
view model =

很好，您可以在以后对语言更熟悉时添加注释，这就是我的学习方法。

有关工作版本的链接，请参见 here。