小编Kao*_*shi的帖子

当我运行以下命令时,ArgumentError似乎忽略了rescue.来自Ruby的ArgumentError错误消息出现在控制台上,但我的puts消息却没有.我尝试使用TypeError和ZeroDivisionError进行救援,但它确实有效.

def divide(a, b)
    begin
        a.to_s + ' divided by ' + b.to_s + ' is ' + (a/b).to_s
    rescue ArgumentError
        puts 'there must be two arguments'
    end 
end

divide(4)

我正在尝试在clojurescript中为three.js 创建一个场景示例.

我不是在做动画而只想显示静态场景(绿色块).

问题似乎出现在此函数中,该函数被调用以渲染场景.

    (defn ^:export draw []
      (.render renderer scene camera)
    )

这是从HTML进行调用的内容.

    %script{:type => "text/javascript"}
      three.demo.draw();

它会看到并运行绘图功能,例如,当我将"HELLO"打印到文档正文时.

    (.write js/document "HELLO")

我不知道什么是错的,页面上的其他内容都会呈现.

在这个HTML文件中,我有

<script src='https://raw.github.com/mrdoob/three.js/master/build/three.js'></script>
<script src='js/main.js' type='text/javascript'></script>
<script type='text/javascript'>goog.require('main')</script>

和

<script type='text/javascript'>
  three.demo.draw();
</script>

下面是main.js的结尾,它是从clojurescript文件创建的Javascript.

    goog.provide("three.demo");
    goog.require("cljs.core");
    goog.require("goog.dom");
    three.demo.scene = new THREE.Scene;
    three.demo.camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1E3);
    three.demo.renderer = new THREE.WebGLRenderer;
    three.demo.renderer.setSize(window.innerWidth, window.innerHeight);
    document.body.appendChild(three.demo.renderer.domElement);
    three.demo.geometry = new THREE.CubeGeometry(1, 1, 1);
    three.demo.material = new THREE.MeshBasicMaterial(cljs.core.ObjMap.fromObject(["\ufdd0'color"], {"\ufdd0'color":255}));
    three.demo.cube = new THREE.Mesh(three.demo.geometry, three.demo.material);
    three.demo.scene.add(three.demo.cube);
    three.demo.camera.position.setZ(5);
    three.demo.draw …

我见过两个消息来源说以下是身份单身.但我不认为这是真的,因为它违反了第三个Monad法.

(defn result [v] (fn [] v))
(defn bind [mv f] (f (mv))

失败了第三个Monad法

(bind (bind (result 3) identity) identity)

内部绑定调用返回3,这不是monadic值,因此Java返回尝试调用函数的错误(3).

我错过了什么吗？