javascript事件学习例子

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本文演示了几个javascript中进行事件操作的例子。

冒泡型事件

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title> 冒泡型事件 </title>
<script language="javascript">
function add(s) {
	var div = document.getElementById('display');
	div.innerHTML += s;
}
</script>
</head>
<body onclick="add('body<br>')">
<div onclick="add('div<br>')">
	<p onclick="add('p<br>')">click me</p>
</div>
<div id="display">
</div>
</body>
</html>

监听函数

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title> 监听函数 </title>
<script language="javascript">
window.onload = function() {
	var o = document.getElementById('p1');
	o.onclick = function() {
		alert('我被点击了');
	}
}
</script>
</head>
<body>
<p id="p1">click me</p>
</body>
</html>
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title> IE的监听函数 </title>
<script>
function fnClick() {
	alert('我被点击了');
	o.detachEvent('onclick', fnClick);
}
var o;
window.onload = function() {
	o = document.getElementById('p1');
	o.attachEvent('onclick', fnClick);
}
</script>
</head>
<body>
<p id="p1">click me</p>
</body>
</html>
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title> 标准DOM事件监听 </title>
<script>
function fnClick1() {
	alert('click1');
	//o.removeEventListener('click', fnClick2, false);
}
function fnClick2() {
	alert('click2');
}
var o;
window.onload = function() {
	o = document.getElementById('p1');
	o.addEventListener('click', fnClick1, false);
	o.addEventListener('click', fnClick2, false);
}
</script>
</head>
<body>
<p id="p1">click me</p>
</body>
</html>

事件的类型

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title> 事件的类型 </title>
<script>
function handle(e) {
	e = e || window.event;
	var o = document.getElementById('display');
	if (e.type == 'click')
		o.innerHTML += '你点击了我<br>';
	else if (e.type == 'mouseover')
		o.innerHTML += '你移动到我上方<br>';
}
window.onload = function() {
	var img = document.getElementsByTagName('img')[0];
	img.onclick = handle;
	img.onmouseover = handle;
}
</script>
</head>
<body>
<img src="01.jpg" />
<div id="display"></div>
</body>
</html>

获取事件的目标

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title> 获取事件的目标 </title>
<script>
function handle(e) {
	e = e || window.event;
	var target = e.srcElement || e.target;
	alert(target.tagName)
}
window.onload = function() {
	var img = document.getElementsByTagName('img')[0];
	img.onclick = handle;
}
</script>
</head>
<body>
<img src="01.jpg" />
</body>
</html>

鼠标事件

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title> 鼠标事件 </title>
<script>
function handle(evt) {
	evt = evt || window.event;
	var o = document.getElementById('display');
	o.innerHTML += evt.type + '<br>';
}
window.onload = function() {
	var p1 = document.getElementById('p1');
	p1.onmousedown = handle;
	p1.onmouseup = handle;
	p1.onmouseover = handle;
	p1.onmouseout = handle;
	p1.onclick = handle;
	p1.ondblclick = handle;
}
</script>
</head>
<body>
<p id="p1">helloworld</p>
<div id="display"></div>
</body>
</html>
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title> 鼠标button属性 </title>
<script>
function TestClick(event) {
	event = event || window.event;
	var div1 = document.getElementById('display');
	div1.innerHTML += event.button;
}
document.onmousedown = TestClick;
window.onload = TestClick;
</script>
</head>
<body>
<div id="display"></div>
</body>
</html>

键盘事件

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title> 键盘事件 </title>
<script>
function handle(event) {
	if (window.event) {
		event = window.event;
		event.charCode = (event.type == "keypress") ? event.keyCode : 0;
	}
	var div1 = document.getElementById("display");
	div1.innerHTML += event.type + ":charCode" + event.charCode + "keyCode:" + event.keyCode + "<br>";
}
window.onload = function() {
	var ta = document.getElementsByTagName('textarea')[0];
	ta.onkeypress = handle;
	ta.onkeydown = handle;
}
</script>
</head>
<body>
<textarea rows="4" cols="50"></textarea>
<div id="display"></div>
</body>
</html>

屏蔽鼠标右键

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title> 屏蔽鼠标右键 </title>
<script>
function block(event) {
	event = event || window.event;
	if (event.button == 2) {
	//	alert("鼠标右键不可用");
		return false;
	}
}
document.onmousedown = block;
</script>
</head>
<body>
<p>屏蔽鼠标右键</p>
</body>
</html>

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title> 屏蔽鼠标右键 </title>
<script>
function block(event) {
	if (window.event) {
		event = window.event;
		event.returnValue = false;
	} else {
		event.preventDefault();
	}
}
document.oncontextmenu = block;
</script>
</head>
<body>
<p>屏蔽鼠标右键</p>
</body>
</html>

伸缩的二级菜单

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title> 伸缩的二级菜单 </title>
<style type="text/css">
/*一级菜单样式*/
#navigation ul {
	list-style-type: none;
	margin: 0px;
	padding: 0px;
}
#navigation ul li {
	border-bottom: 1px solid #ed9f9f;
}
#navigation ul li a {
	display: block;
	padding: 5px 5px 5px 0.5em;
	text-decoration: none;
	border-left: 12px solid #711515;
	border-right: 1px solid #711515;
}
#navigation ul li a:link, navigation ul li a:visited {
	background-color: #c11136;
	color: #fff;
}
#navigation ul li a:hover {
	background-color: #990020;
	color: #ffff00;
}
/*二级菜单样式*/
#navigation ul li ul {
	list-style-type: none;
	margin: 0px;
	padding: 0px 0px 0px 0px;
}
#navigation ul li ul li {
	border-top: 1px solid #ed9f9f;
}
#navigation ul ul li a {
	display: block;
	padding: 3px 3px 3px 0.5em;
	text-decoration: none;
	border-left: 28px solid #a71f1f;
	border-right: 1px solid #711515;
}
#navigation ul li ul li a:link, #navigation ul li ul li a:visited {
	background-color: #e85070;
	color: #fff;
}
#navigation ul li ul li a:hover {
	background-color: #c2425d;
	color: #ff0;
}
#navigation ul li ul.myHide {
	display: none;
}
#navigation ul li ul.myShow {
	display: block;
}
</style>
<script language="javascript">
window.onload = function() {
	var ul = document.getElementById('listUL');
	var li = ul.childNodes;
	var a;
	for (var i = 0; i < li.length; i++) {
		if (li[i].tagName == 'LI' && li[i].getElementsByTagName('ul').length) {
			a = li[i].firstChild;
			a.onclick = change;
		}
	}
}
function change() {
	var div = this.parentNode.getElementsByTagName('ul')[0];
	if (div.className == 'myHide')
		div.className = 'myShow';
	else
		div.className = 'myHide';
}
</script>
</head>
<body>
<div id="navigation">
	<ul id="listUL">
		<li><a href="#">Home</a></li>
		<li><a href="#">News</a>
		<ul class="myHide">
			<li><a href="#">Latest News</a></li>
			<li><a href="#">All News</a></li>
		</ul>
		</li>
		<li><a href="#">Wheather</a>
		<ul class="myHide">
			<li><a href="#">Today's Weather</a></li>
			<li><a href="#">Forecast</a></li>
		</ul>
		</li>
		<li><a href="#">Contact Me</a></li>
	</ul>
</div>
</body>
</html>