繁體中文当前位置: 首页 > 图文教程 > 网络编程 > Javascript > Javascript 的addEventListener()及attachEvent()区别分析
- Javascript
- JavaScript脚本:在网页中绘制图表
- Jquery在实用和易学使用上的特点
- 网页制作之Javascript代码技巧
- 利用Java程序把Word文档转换成Html文件
- 提供gif icon制作的几个站点
- JavaScript 实现 Konami Code
- 实用Javascript Tab导航插件23个
- 掌握JavaScript语言的思想前提
- 可以制作动画菜单效果的jquery插件
- 从脚本编程的角度看JSP的安全
- JavaScript教程：伸缩菜单的制作
- Javascript 代码也可以变得优美
- 与JavaScript新人共同分享实用经验
- 远程控制顺畅无阻碍-java来实现
- Java开源的高性能缓存框架
- 通过代理访问因特网上的Web服务器
- JavaScript基础教程：调试及应用
- 通过SSH交互进行Java应用开发
- Java API编写自己的NamespaceContext
- Java编程教程：SecureJSH特性简介
Javascript 的addEventListener()及attachEvent()区别分析
出处:互联网 整理: 软晨网（RuanChen.com） 发布: 2009-09-12 浏览: 337 ::
收藏到网摘: n/a
大家都知道事件的用法就是当某个事件(状况)被触发了之后就会去执行某个Function, 尤其是Javascript, 在当红AJAX的催化下, 了解Javascript的Event用法更加重要, 在这里就大概介绍一下avascript的Event用法.
从W3C的发展时间轴来看, DOM(Document Object Model)的模型可以分为两种, DOM 0 及 DOM 2. 从数字来看就可以知道DOM 0 当然是比较旧的协议, 我们可以从以下的表格来看:
DOM1 协定:
|
Event Name |
Description |
|
onblur() |
The element has lost focus (that is, it is not selected by the user). |
|
onchange0 |
The element has either changed (such as by typing into a text field) or the element has lost focus. |
|
onclick0 |
The mouse has been clicked on an element. |
|
ondblclick() |
The mouse has been double-clicked on an element. |
|
onfocus() |
The element has gotten focus. |
|
onkeydown() |
A keyboard key has been pressed down (as opposed to released) while the element has focus. |
|
onkeypress() |
A keyboard key has been pressed while the element has focus. |
|
onkeyup() |
A keyboard key has been released while the element has focus. |
|
onload() |
The element has loaded (document, frameset, or image). |
|
onmousedown() |
A mouse button has been pressed. |
|
onmousemove() |
The mouse has been moved. |
|
onmouseout() |
The mouse has been moved off of or away from an element. |
|
onmouseover() |
The mouse has moved over an element. |
|
onmouseup() |
A mouse button has been released. |
|
onreset() |
The form element has been reset, such as when a form reset button is pressed. |
|
onresize() |
The window's size has been changed. |
|
onselect() |
The text of a form element has been selected. |
|
onsubmit() |
The form has been submitted. |
|
onunload() |
The document or frameset has been unloaded. |
DOM2 的进化:
|
DOM 0 Event |
DOM 2 Event |
|
onblur() |
blur |
|
onfocus() |
focus |
|
onchange() |
change |
|
onmouseover() |
mouseover |
|
onmouseout() |
mouseout |
|
onmousemove() |
mousemove |
|
onmousedown() |
mousedown |
|
onmouseup() |
mouseup |
|
onclick() |
click |
|
ondblclick() |
dblclick |
|
onkeydown() |
keydown |
|
onkeyup() |
keyup |
|
onkeypress() |
keypress |
|
onsubmit() |
submit |
|
onload() |
load |
|
onunload() |
unload |
新的DOM2 用法可以addEventListener()这个函数来观察到:
addEventListener(event,function,capture/bubble);
参数event如上表所示, function是要执行的函数, capture与bubble分别是W3C制定得两种时间模式,简单来说capture就是从document的开始读到最后一行, 再执行事件, 而bubble则是先寻找指定的位置再执行事件.
capture/bubble的参数是布尔值, True表示用capture, False则是bubble.Windows Internet Explorer也有制定一种EventHandler, 是 attachEvent(), 格式如下:
window.attachEvent(”submit”,myFunction());
比较特别的是attachEvent不需要指定capture/bubble的参数, 因为在windows IE环境下都是使用Bubble的模式.这里用图像的Rollover例子来表现事件的用法:
<!DOCTYPE HTML PUBLIC “-//W3C//DTD HTML 4.01//EN”
“http://www.w3.org/TR/html4/strict.dtd“>
<html>
<head>
<title>Rollover</title>
<script type=”text/javascript”>function moveOver(imgObj) {
if (typeof window.addEventListener != “undefined”) {
imgObj.addEventListener(”mouseover”,function(){imgObj.src = imgObj.id +
“_over.png”;}, false);
imgObj.addEventListener(”mouseout”, function(){imgObj.src = imgObj.id +
“_default.png”;}, false);
} else {
imgObj.attachEvent(”onmouseover”,function(){imgObj.src = imgObj.id +
“_over.png”;});
imgObj.attachEvent(”onmouseout”, function(){imgObj.src = imgObj.id +
“_default.png”;});
}
}
function rollover() {
var images = document.getElementsByTagName(”img”);
var roll = new RegExp (”rollover”);
var preload = [];
for (var i = 0; i < images.length; i++) {
if (images[i].id.match(roll)) {
preload[i] = new Image();
preload[i].src = images[i].id + “_over.png”;
moveOver(images[i]);
}
}
}
if (typeof window.addEventListener != “undefined”) {
window.addEventListener(”load”,rollover,false);
} else {
window.attachEvent(”onload”,rollover)
}
</script>
</head>
<body>
<p><img id=”rollover_home” name=”img_home” src=”rollover_home_default.png”
alt=”Home”></p>
<p><img id=”rollover_about” name=”img_about” src=”rollover_about_default.png”
alt=”About”></p>
<p><img id=”rollover_blog” name=”img_blog” src=”rollover_blog_default.png”
alt=”Blog”></p>
<p><img id=”logo” name=”img_logo” src=”logo.png” alt=”Braingia Logo”></p>
</body>
</html>
上述的 typeof window.addEventListener != “undefined” 程序代码可以判断使用者的浏览器是否支持AddEventListener这个事件模型, 如果不支持就使用attachEvent.
W3C 及 IE 同时支持移除指定的事件, 用途是移除设定的事件, 格式分别如下:
W3C格式:
removeEventListener(event,function,capture/bubble);
Windows IE的格式如下:
detachEvent(event,function);
数据参考: Chapter 14 - Browsers and JavaScript, JavaScript Step by Step, by Steve Suehring
评论 (0) All
