replacing div content with javascript

Question

I\'m trying to do this with pure javascript, not with jquery. I have a div that has an id test and contains other divs inside it. How do I empty the content of

Answer 1

clear the div:

document.getElementById('test').innerHTML = '';

replace it :

var h1 = document.createElement('h1');
h1.innerHTML = "hello world!";
document.getElementById('test').appendChild(h1);