console 命令行工具 X clear

console

function init() {
	var renderer = new THREE.WebGLRenderer({
    canvas: document.getElementById('mainCanvas')
  });
  renderer.setClearColor(0x000000);

  var scene = new THREE.Scene();

  // var camera = new THREE.PerspectiveCamera(45, 4 / 3, 1, 1000);
  // camera.position.set(0, 0, 5);
  // scene.add(camera);
  var camera = new THREE.OrthographicCamera(-1, 1, 1.5, -1.5, 1, 5);
  camera.position.set(0, 0, 5);
  scene.add(camera);

  // var cube = new THREE.Mesh(new THREE.CubeGeometry(1, 2, 3),
  //         new THREE.MeshBasicMaterial({
  //             color: 0xff0000
  //         })
  // );
  // scene.add(cube);
  var cube = new THREE.Mesh(new THREE.CubeGeometry(1, 1, 1),
        new THREE.MeshBasicMaterial({
            color: 0xff0000,
            wireframe: true
        })
);
// cube.position.z = 3;
scene.add(cube);

  renderer.render(scene, camera);  
}

<body onload="init()">
    <canvas id="mainCanvas" width="400px" height="300px" ></canvas>
</body>