javascript change background color of class code example

Example 1: javascript style background color

// change background color for specific id ..
function changebackground(){
	document.getElementById('id').style.backgroundColor = 'green' ; 
}
// change background color for whole body..
function changebackground(){
	document.body.style.backgroundColor = 'green';
}

Example 2: javascript change color for class name

function reset() {
	var elements = document.getElementsByClassName('pixel'); // get all elements
	for(var i = 0; i < elements.length; i++){
		elements[i].style.backgroundColor = "white";
	}
}