How to remake a simple js slider script?

Question

JavaScript

There is a spoiler JS script. 3 links when you click them, text appears under them.
How to make 1 block already open when entering the page.
1Spoiler
2Spoiler
3Spoiler
BLOCK1
BLOCK2
BLOCK3

Answer 1

As an option - look at the current page address with js and, based on this, automatically open the desired block, simulating a click on the desired element