<html>
<body>
<p id="demo">Click the button to display the natural logarithm of different numbers.</p>
<button onclick="myFunction()">Try it</button>
<script>
function myFunction()
{
var a=Math.log(2.7183);
var b=Math.log(2);
var c=Math.log(1);
var d=Math.log(0);
var e=Math.log(-1);
var x=document.getElementById("demo");
x.innerHTML=a + "<br>" + b + "<br>" + c + "<br>" + d + "<br>" + e
}
</script>
</body>
</html>