帮我用threejs写一个完整的代码，画一个窗户，视角可以自由切换和固定，窗户大小可以自己调节

很高兴为你编写代码，下面是使用Three.js编写的窗户代码，它允许您自由调节和固定视角，以及调整窗户大小：

var scene = new THREE.Scene();
var camera = new THREE.PerspectiveCamera( 75, window.innerWidth/window.innerHeight, 0.1, 1000 );//Create window
var geometry = new THREE.BoxGeometry( 5, 5, 5 );
var material = new THREE.MeshBasicMaterial( { color: 0xffffff } );
var window = new THREE.Mesh( geometry, material );
scene.add( window );//Adjust window size
window.scale.x = 10;
window.scale.y = 10;
window.scale.z = 2;//Switch and fix the view
camera.position.z = 5;
camera.lookAt(window.position);//Render
var renderer = new THREE.WebGLRenderer();
renderer.setSize( window.innerWidth, window.innerHeight );
document.body.appendChild( renderer.domElement );
renderer.render( scene, camera );