Create a javascript function for all application buttons

Question

Guys, I would like to create a javascript function for all the buttons of the application, IE, every button when it is clicked it will call this function.

Note: No need to put the onclick on each button.

Thank you!!

Answer 1

var buttons = document.getElementsByTagName("button");
var buttonsCount = buttons.length;
for (var i = 0; i < buttonsCount; i += 1) {
    buttons[i].onclick = function(e) {
        alert(this.id);
        // O que quer que ele faça
    };
}

button {
padding: 10px;
font-size: 13px;
}

<button id='1'>Clique</button>
<button id='2'>Clique</button>
<button id='3'>Clique</button>
<button id='4'>Clique</button>