pass values from text field in javascript code example

Example 1: insert value to html input with javascript variable

function product(a, b) {
   return a * b;
}
function setInputValue(input_id, val) {
    document.getElementById(input_id).setAttribute('value', val);
}

Example 2: How to Pass Parameter in JavaScript Function From Html

<!DOCTYPE html>
<html>
<head>
	<title>function parameters javascript</title>
</head>
<body>
<button onclick="myfunctionName('rohan')">Click</button>

<script type="text/javascript">
	
	function myfunctionName(a){

		alert(a);
		
	}

</script>
</body>
</html>

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