how to use variables from js in html code example

Example 1: js variable html

<div onload="document.innerHTML(name + ' is ' + age)">

Example 2: how to create variables using javascript

var myVar;       //unitialized variable( can be intiallized later )
var number = 1; //number
var string = " hello world " ; //string
var boolean = true ;  //boolean
myVar = function(){  //variable can hold function
  
};