bn.js

这是一个在线考试系统

// JavaScript Document
function setupButtons() {
	var objInputs = document.getElementsByTagName("INPUT");
	var objButton;
	
	for (var i=0; i<objInputs.length; i++) {
		if (objInputs[i].className == "button") {
			addEvent(objInputs[i], "mouseover", buttonOver);
			addEvent(objInputs[i], "mouseout", buttonOut);
		}
	}
}

function buttonOver(event) {
	var currentButton = getEventSrc(event);
	currentButton.className = "button1";
}

function buttonOut(event) {
	var currentButton = getEventSrc(event);
	currentButton.className = "button";
}

function getEventSrc(e) { 
	// get a reference to the IE/windows event object 
	if (!e) e = window.event; 

	// DOM-compliant name of event source property 
	if (e.target) {
		return e.target; 
	}
	// IE/windows name of event source property 
	else if (e.srcElement) {
		return e.srcElement;
	} 
}

function addEvent(obj, evType, fn){ 
	if (obj.addEventListener){ 
		obj.addEventListener(evType, fn, false); 
		return true; 
	} else if (obj.attachEvent){ 
		var r = obj.attachEvent("on"+evType, fn); 
		return r;
	} else {
		alert("Handler could not be attached");
		return false; 
	}
}
function initDoc() {
	setupButtons();
}

addEvent(window, "load", initDoc);