I don't understand specifically what `+e.target.innerText` does?

Question

JavaScript

I don't understand specifically what `+e.target.innerText` does

onYearBtnClick(e) {
    this.props.setYear(+e.target.innerText)
  }

Answer 1

They wrote in the comment that this is a unary plus, so that the text inside the node from the string is converted to a number.
https://learn.javascript.ru/operators

Answer 2

e.target - the element that was clicked
innerText - the text content of the element