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
- 可实现多表单提交的javascript函数
- 比较详细的关于javascript中void(0)的具体含义解释
- 随机显示经典句子或诗歌的javascript脚本
- javascript实现的多条新闻公告系统
- 解析arp病毒背后利用的Javascript技术附解密方法
- 比较详细的javascript对象的property和prototype是什么一种关系
- 访问百度和谷歌网速测试的javascript代码
- javascript 动态改变层的Z-INDEX的代码style.zIndex
- javascript+css实现单击颜色褪去效果
- javascript 表单日期选择效果
- 比较简单的javascript实现input双击后可以编辑
- javascript实现的颜色块滑动的动态效果
- js实现网页检测是否安装了 Flash Player 插件
- javascript 实现父窗口引用弹出窗口的值的脚本
- javascript 实现双击才能打开链接的方法
- 用javascript实现兼容IE7的类库 IE7_0_9.zip提供下载
- document.createElement("A")比较不错的属性
- 用javascript实现不按Ctrl实现Multiple Select多选
- JavaScript-世界上误解最深的语言分析
- IE和Mozilla的兼容性汇总event
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: 329 ::
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
