<button id="like-btn" />

const elm = document.getElementById('like-btn')
const cachedText = window.localStorage.getItem('likeBtnStateText') || 'Please Like'

elm.innerHTML = cachedText

elm.addEventListener('click', e => {
    e.preventDefault()
    const newText = 'Thanks for Liking!'
    
    elm.innerHTML = newText
    window.localStorage.setItem('likeBtnStateText', newText)
    // do some other stuff
})