open_in_new content_copy 
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>REACT</title>

</head>
<body>
    <BUTTON> button clicked </BUTTON>
    
    <!---bind keyword ued in javascript -->
</body>
<script>
    class 
    {
        constructor (){
            this.library = "REACT"
            this.server = "http//jnvnvnf"

            document
            .querySelector('button')
            .addEventListener('click',this.handleclicked.
            bind(this))/// bind is used to access this server to get all the refereneces 
        
            handleclicked() 
            {
                console.log("button clicked");
                console.log(this.server);
            }
        }
    }
</script>
</html>