js var in html code example

Example 1: html use js variable as text

<h1>"My number: " <span id="myText"></span></h1>

<script>

	//You can use an IIFE (Immediately Invoked Function Expression)
	(() => {
  		var number = "123";
		document.getElementById("myText").innerHTML = number;
	})();
</script>

Example 2: var javascript

var is a keyword to define the varible in js but as of es-6 we, use let and const keywords for the same

Example 3: how to define variable in javascript

var <variable-name>;

var <variable-name> = <value>;