Add event to object in javascript

// Find all the ‘li’ elements, to attach the event handlers to them

var li = document.getElementsByTagName(“li”);
for ( var i = 0; i < li.length; i++ ) {
// Attach a mouseover event handler to the ‘li’ element,
// which changes the ‘li’s background to blue.
li[i].onmouseover = function() {
this.style.backgroundColor = ‘blue’;
};
// Attach a mouseout event handler to the ‘li’ element
// which changes the ‘li’ background back to its default white
li[i].onmouseout = function() {
this.style.backgroundColor = ‘white’;
};
}