Can't play simple animtion

hi, everyone !
i just got in touch with three.js , i use GLTFLoader to load my custom model, and add the material
but i reference some article online that to play animation, but i don’t know the model why can’t do it.

The following is my code, can someone tell me maybe i forget something what ?

I find problem point!
It turns out that I forgot to add this code
anim