how to make a button call a javascript function code example

Example 1: onclick a tag

<a href='http://www.google.com' onclick='return check()'>check</a>

<script type='text/javascript'>
function check() {
    return false;
}
</script>

Example 2: javascript click event

<button onclick="myFunction()">Click me</button>

<p id="demo"></p>

<script>
function myFunction() {
  document.getElementById("demo").innerHTML = "Hello World";
}
</script>

Example 3: javascript onclick button

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

Example 4: calling function on click html

<img src="hospital.png" id="hospitals" onclick="damarkers();">

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