oyente de eventos javascript onclick
document.getElementById("myBtn").addEventListener("click", function() {
alert("Hello World!");
});
botón onclick de javascript
var button = document.querySelector('button');
button.onclick = function() {
//do stuff
}
evento de clic en javascript
<button onclick="myFunction()">Click me</button>
<p id="demo"></p>
<script>
function myFunction() {
document.getElementById("demo").innerHTML = "Hello World";
}
</script>
botón javascript onclick
document.getElementById('button').onclick = function() {
alert("button was clicked");
};