I dont know how to select function react in document.getElementsByClassName.

I have this

document.getElementsByClassName('card-list__card grid-layout-item grid-list-item')[0]

return 

"__reactInternalInstance$6xvjhfpf2k": Object { tag: 5, key: "545570876", elementType: "div", … }

This function __reactInternalInstance as random variable.

when I reload the page the function changes name how I can select this to recover the key ?

document.getElementsByClassName('card-list__card grid-layout-item grid-list-item')[0].__reactInternalInstance*

is there an equivalent?

Thank's for your help.