Add materials to obj

cant find how to add mtl file to obj(need to replace child.material.color with MTL file )

this is my code,plz help

    var loadOBJ = function(){
	var manager = new THREE.LoadingManager();
	var loader = new THREE.OBJLoader( manager );
	loader.load( 'box.obj', addBoxInScene);


var addBoxInScene = function(object){
	Box = object;
	Box.position.x = -3;
	Box.position.y = -1;
	Box.position.z = 490;
	//Go through all children of the loaded object and search for a Mesh
	object.traverse( function ( child ) {
		//This allow us to check if the children is an instance of the Mesh constructor
		if(child instanceof THREE.Mesh){
			child.material.color = new THREE.Color(0Xf25922);
			//Sometimes there are some vertex normals missing in the .obj files, ThreeJs will compute them
	//Add the 3D object in the scene

The following official example demonstrates how to load an OBJ along its MTL file using OBJLoader and MTLLoader:

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