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JavaScript onmouseover 事件

出处:互联网   整理: 软晨网（RuanChen.com）   发布: 2009-03-04   浏览: 1121 ::
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Definition and Usage
定义与用法

The onmouseover event occurs when the mouse pointer moves over a specified object.
当鼠标移动到特定对象上时触发onmouseover事件。

Syntax
语法

onmouseover="所要执行的脚本"

Parameter
参数		 Description
注释
SomeJavaScriptCode
所要执行的脚本		 Required. Specifies a JavaScript to be executed when the event occurs.
必选项。当事件触发时所要执行的脚本

Supported by the following HTML tags:
所支持的HTML标签：

<a>, <address>, <area>, <b>, <bdo>, <big>, <blockquote>, <body>, <button>, <caption>, <cite>, <code>, <dd>, <dfn>, <div>, <dl>, <dt>, <em>, <fieldset>, <form>, <h1> to <h6>, <hr>, <i>, <img>, <input>, <kbd>, <label>, <legend>, <li>, <map>, <ol>, <p>, <pre>, <samp>, <select>, <small>, <span>, <strong>, <sub>, <sup>, <table>, <tbody>, <td>, <textarea>, <tfoot>, <th>, <thead>, <tr>, <tt>, <ul>, <var>

Supported by the following JavaScript objects:
所支持的JavaScript对象：

layer, link

Example 1
实例1

In the following example we will display an alert box when the user moves the mouse pointer over the image:
在下面的例子中，当用户将鼠标移到图片上时将弹出一个消息框：

<img src="image_w3default.gif" alt="ruanchen"
onmouseover="alert('ruanchen!')" />

The output of the code above will be:
上述代码的输出结果为：

ruanchen

Example 2
实例2

In the following example we will add an image that should act as a link button on a web page. We will then add an onMouseOver event and an onMouseOut event that will run two JavaScript functions that will change between two images:
在下面的例子中，我们首先加入一张图片做为链接。接着我们加入onMouseOver事件和onMouseOut事件，实现图片链接的切换：

<html>
<head>
<script type="text/javascript">
function mouseOver()
{
document.b1.src ="b_blue.gif"
}
function mouseOut()
{
document.b1.src ="b_pink.gif"
}
</script>
</head>
<body>
<a href="http://www.ruanchen.com" target="_blank"
onmouseover="mouseOver()"
onmouseout="mouseOut()">
<img border="0" alt="ruanchen!"
src="b_pink.gif" name="b1" /></a>
</body>
</html>

The output of the code above will be:
上述代码的输出结果为：

ruanchen!

Try-It-Yourself Demos
互动演示

onmouseover
How to use onmouseover.
如何应用onmouseover

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