html button javascript function code example

Example 1: javascript onclick

document.getElementById("myBtn").addEventListener("click", function() {
  alert("Hello World!");
});

Example 2: button functions html

<script>
 function myFunction() {
   alert("ALERT");
 }
</script>
<button onclick="myFunction">Click</button>

Example 3: javascript button onclick

document.getElementById('button').onclick = function() {
   alert("button was clicked");
};

Example 4: javascript onclick button

var button = document.querySelector('button');
button.onclick = function() {
  //do stuff
}

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Misc Example

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