The example is taken from threejs website.
You may want to download three.js and change the script source below.
There are many more advanced examples under this link.
HTML:
<html>
<head>
<meta charset=utf-8>
<title>My first Three.js app</title>
<style>
body { margin: 0; }
canvas { width: 100%; height: 100% }
</style>
</head>
<body>
<script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r83/three.js"></script>
<script>
// Our JavaScript will go here.
</script>
</body>
The basic scene with a static cube in JavaScript:
var scene = new THREE.Scene();
var camera = new THREE.PerspectiveCamera( 75, window.innerWidth/window.innerHeight, 0.1, 1000 );
var renderer = new THREE.WebGLRenderer();
renderer.setSize( window.innerWidth, window.innerHeight );
document.body.appendChild( renderer.domElement );
var geometry = new THREE.BoxGeometry( 1, 1, 1 );
var material = new THREE.MeshBasicMaterial( { color: 0x00ff00 } );
var cube = new THREE.Mesh( geometry, material );
scene.add( cube );
camera.position.z = 5;
To actually see anything, we need a Render() loop:
function render() {
requestAnimationFrame( render );
renderer.render( scene, camera );
}
render();