为什么我在three.js中更改变量名称时，我的图形不呈现？

Question

The following code works fine and is taken from https://threejsfundamentals.org/threejs/lessons/threejs-prerequisites.html .以下代码工作正常，取自https://threejsfundamentals.org/threejs/lessons/threejs-prerequisites.html 。 But a peculiar thing happens when I change the value of the variable canvas to something else like canvas2.但是当我将变量 canvas 的值更改为类似 canvas2 的其他值时，会发生一件奇怪的事情。 Why is that?这是为什么？

<html>
    <script type = "module">
    import * as THREE from "../three.js/build/three.module.js"
    function main() {
  const canvas = document.querySelector('#c');
  const renderer = new THREE.WebGLRenderer({canvas});

  const fov = 75;
  const aspect = 2;  // the canvas default
  const near = 0.1;
  const far = 5;
  const camera = new THREE.PerspectiveCamera(fov, aspect, near, far);
  camera.position.z = 2;
  const scene = new THREE.Scene();
  const boxWidth = 1;
  const boxHeight = 1;
  const boxDepth = 1;
  const geometry = new THREE.BoxGeometry(boxWidth, boxHeight, boxDepth);
  const material = new THREE.MeshBasicMaterial({color: 0x44aa88});  
  const cube = new THREE.Mesh(geometry, material);
  scene.add(cube);

  renderer.render(scene, camera);
}
main();
    </script>
    <body>
         <canvas id="c" width="1200" height="600"  >
        </canvas>
    </body> 
<script>

</script>
</html>

For instance, if I change, the lines involving canvas as the following, the code doesn't work例如，如果我更改，涉及 canvas 的行如下，代码不起作用

const somethingElse = document.querySelector('#c');
   const renderer = new THREE.WebGLRenderer({somethingElse});

Answer 1

So apparently, {something} is a shortcut for {something:something}, which I had missed, so there you have it.显然，{something} 是 {something:something} 的快捷方式，我错过了，所以你有它。

为什么我在three.js中更改变量名称时，我的图形不呈现？

问题描述

1 个解决方案

解决方案1
0 2020-05-04 12:19:46

为什么我在three.js中更改变量名称时，我的图形不呈现？

问题描述

1 个解决方案

解决方案1 0 2020-05-04 12:19:46

解决方案1
0 2020-05-04 12:19:46