Question

我正在尝试将一些简单的示例从JavaScript转换为ClojureScript，以熟悉ClojureScript，但是对于它来说，我无法绕过这个snippet：

var game = new Phaser.Game(800, 600, Phaser.CANVAS, 'example', { create: create });

function create() {
    var text = "- phaser -\n with a sprinkle of \n pixi dust.";
    var style = { font: "65px Arial", fill: "#ff0044", align: "center" };

    var t = game.add.text(game.world.centerX-300, 0, text, style);
}

为：

;; Uncaught ReferenceError: game is not defined
(defn create []
  (let [text "- phaser -\n with a sprinkle of \n pixi dust."
        style (js-obj "font" "65px Arial" "fill" "#ff0044" "align" "center")]
    (game.add.text (- game.world.centerX 300) 0 text style)))

(def game (js/Phaser.Game. 800 600 js/Phaser.CANVAS "example" #js {:create create}))

问题在于我还试图从ClojureScript中的函数自我引用待定义的对象 - 我感觉这在ClojureScript中是不对的和/或惯用的思考，所以如何有人接近这种情况吗？

编辑：

;; Working example
(declare game)

(defn create []
  (let [text "- phaser -\n with a sprinkle of \n pixi dust."
        style (js-obj "font" "65px Arial" "fill" "#ff0044" "align" "center")]
    (.text game.add (- (.-centerX game.world) 300) 0 text style)))

(def game (js/Phaser.Game. 800 600 js/Phaser.CANVAS "example"  #js {:create create}))

Answer 1

Clojure不会在函数之后获取定义，因此它超出了范围。您可以将其放在范围内，将其移至功能上方，或将declare放在文件顶部。

https://clojuredocs.org/clojure.core/declare

ClojureScript自引用

1 个答案: