let all_btn = document.querySelectorAll("button");
all_btn.forEach(function(btn) {
btn.addEventListener("click", function() {
console.log(this.innerHTML + " is clicked")
});
});
// one line code
// let all_btn=document.querySelectorAll("button");all_btn.forEach(function(n){n.addEventListener("click",function(){console.log(this.innerHTML+" is clicked")})});