how to create a when a button is clicked code example

Example 1: run a function when a button has the onclick

<script>
function myFunction() {
  alert("ALERT THIS FUNCTION HAS RUNNED");
}
</script>
<button onclick="myFunction">click to run function</button>

Example 2: how to make a button in javascript

<button id="btn">button</button>

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Java Example

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