How to turn on / off the function with one button?

Question

JavaScript

How to enable and disable the function with one button (on pure JS)?
There is such an entry, but it does not work ....

document.querySelector('#offer button').addEventListener('toggle', createContent);

function createContent() {
....
}

Answer 1

The function cannot be turned on and off, it can only be called. Two functions can be used:

function createContent() { ... }
function deleteContent() { ... }

There is also an option with a variable:

const content = function () {
    var isCreated = false
    const this.change = function () {
        if(isCreated) {
            isCreated = false
            ...
        } else {
            isCreated = true
            ...
        }
    }
}