How can camera go back to its original matrix including position and rotation

I tried to setup the camera back to the original position after all the animations by below, but did not work. Camx/y/z are the position variables I saved from the beginning.
var camera = app.camera;
var camx=camera.position.x;
var camy=camera.position.y;
var camz=camera.position.z;
var camrx=camera.rotation.x;
var camry=camera.rotation.y;
var camrz=camera.rotation.z;
”’
animation code here
”’
camera.position.x=camx;
camera.position.y=camy;
camera.position.z=camz;
camera.rotation.x=camrx;
camera.rotation.y=camry;
camera.rotation.z=camrz;
camera.update();
camera.updateProjectionMatrix();