How to fix this guys

Question

https://code.sololearn.com/W30de4T7cDH8/?ref=app

Answer 1

Modify line 1 in JS to:
onload=()=>{
document.getElementById('solve').addEventListener("click", function(){

at last line put } at end

explanation:
1. why use "document.getElementById('solve')"?
if you just use solve without explicitly referencing it through document.getElementById(), the code will look for a global variable named "solve".

2. Why use "onload=()=>{...}"?
The onload event is used to ensure that all of the resources required by a web page are loaded and ready before executing any JavaScript code.

Answer 2

Thx it's really helpful