Update '12/torusKnot.js'

12/torusKnot.js

@@ -1,6 +1,6 @@
 var scene = new THREE.Scene();
 var camera = new THREE.PerspectiveCamera( 75, window.innerWidth/window.innerHeight, 0.1, 100 );
-
+var canvas = document.getElementById('torusKnot');
 var renderer = new THREE.WebGLRenderer();
 renderer.setSize( window.innerWidth/2, window.innerHeight/2 );
 document.body.appendChild( renderer.domElement );