Three.js方法将网格返回为未定义

Question

所以我有我的Car类的这个方法，我想返回网格，但它返回未定义。问题是，即使我在离开carLoader后尝试在控制台上显示它也是未定义的，如果我在carLoader.load（..）中调用console.log就可以了。问题是如何存储它以便我可以使用它？

this.loadCarToScene = function ( carsVector,carName ) {


    var carLoader = new THREE.BinaryLoader();

    var mesh;
    carLoader.load( carsVector[Object.keys(carsVector)[0]].url, function( geometry ) { 

        geometry.sortFacesByMaterialIndex();
        console.log("url--->"+carsVector[Object.keys(carsVector)[0]].url);

        var m = [],
        s = carsVector[ Object.keys(carsVector)[0] ].scale * 1,
        p = carsVector[ Object.keys(carsVector)[0] ].position,
        r =carsVector[ Object.keys(carsVector)[0] ].init_rotation;


        for ( var i in carsVector[ Object.keys(carsVector)[0] ].mmap ) {
            m[ i ] = carsVector[ Object.keys(carsVector)[0] ].mmap[ i ];
        }
        mesh = new THREE.Mesh( geometry, m );

        mesh.rotation.x = r[ 0 ];
        mesh.rotation.y = r[ 1 ];
        mesh.rotation.z = r[ 2 ];
        mesh.scale.x = mesh.scale.y = mesh.scale.z = s;

        mesh.position.set( p[0], p[1], p[2]);

        scene.add(mesh);
        return mesh;        

    });

    console.log("mesh---->" + mesh );

}