<tr>
<td valign="top" colspan="2" class="CLEARSEPARATION"> </td>
</tr><html>
<link rel="stylesheet" href="josh.css">
<body bgcolor="#FFFFFF">
<div id="Description">
<table cellpadding="0" cellspacing="0" border="0" width="100%" class="main">
<tr><td valign="top" class="name">style, CSSStyleDeclaration</td><td valign="top" nowrap class="compatibility">NN <span class="emphasis">6</span> IE <span class="emphasis">4</span> DOM <span class="emphasis">2</span> </td>
</tr>
<tr>
<td valign="top" nowrap class="usage"><p class="literal"></p>
</td><td valign="top" nowrap class="requirements"> </td>
</tr>
<tr>
<td valign="top" colspan="2" class="description">
<p>In its most generic sense, a <span class="literal">style</span> object is the
access point for scripts to read and write individual style
attributes for a given element. This <span class="literal">style</span> object
exposes (or has the potential to expose) every style sheet attribute
supported by the browser (the kinds of CSS attributes described in
Chapter 11).
</p>
</td>
</tr>
<tr>
<td valign="top" colspan="2" class="CLEARSEPARATION"> </td>
</tr>
<tr>
<td colspan="2"><p> In practice, however, a <span class="literal">style</span> object that you
access through an HTML element object's
<span class="literal">style</span> property (one of the shared properties
described early in this chapter) is limited in scope: It reflects
only the CSS settings explicitly defined in the
element's tag via the <span class="literal">style</span>
attribute or settings assigned to the element's
<span class="literal">style</span> property via script. But other style sheets
associated with the browser (internal style sheets) and the document
(explicit style sheet rules defined in the
<span class="literal"><style></span> element and rules imported through
either a <span class="literal">link</span> element or an
<span class="literal">@import</span> rule) also affect the rendered
characteristics of the element. A union of all style sheet attributes
affecting an elementthe effective style definitionmay
be read, but through browser-dependent syntax. IE uses the
<span class="literal">currentStyle</span> property of an element, whereas
Netscape 6 uses the W3C DOM <span class="literal">window.getComputedStyle(
)</span> method. Both syntaxes return an object that lets scripts
inspect the value of each effective style attribute value.
</p>
</td>
</tr>
<tr>
<td valign="top" colspan="2" class="CLEARSEPARATION"> </td>
</tr>
<tr>
<td colspan="2"><p> While the three IE style-related objects (<span class="literal">style</span>,
<span class="literal">currentStyle</span>, and <span class="literal">runtimeStyle</span>)
return a <span class="literal">style</span> object with properties that expose
CSS style attributes, the situation is a little more complex on the
Netscape 6 side. On the one hand, Netscape 6 implements a version of
the W3C DOM <span class="literal">CSSStyleDeclaration</span> object that
exposes all the CSS attributes as properties. This is the version
accessed through an element object's
<span class="literal">style</span> property (just like IE, thus making an
element object's <span class="literal">style</span> property
work cross-browser). But when you read the effective style sheet (via
<span class="literal">window.getComputedStyle( )</span>), the object that comes
back does not expose the CSS attributes directly as properties.
Instead, you must use the <span class="literal">CSSStyleDeclaration</span>
methods (listed below) to inspect a specific attribute value by name.
It's a longer way to reach a particular effective
style attribute value, but very much in keeping with other
attribute-reading syntax deployed throughout the W3C DOM. The only
time this cross-browser disconnect affects you is when you need to
view the effective style attribute for an unmodified style. Once you
set an attribute value via the element object's
<span class="literal">style</span> property, you can read it from the
<span class="literal">style</span> property cross-browser.
</p>
</td>
</tr>
<tr>
<td valign="top" colspan="2" class="CLEARSEPARATION"> </td>
</tr>
<tr>
<td colspan="2"><p> This section lists the available <span class="literal">style</span> object
properties plus the Netscape 6 (W3C DOM) formal methods for accessing
those attributes. The W3C DOM lists a large percentage of the
<span class="literal">style</span> object properties under an object umbrella
called <span class="literal">CSS2Properties</span>. The specification offers
the <span class="literal">CSS2Properties</span> object as an optional
convenience for browsers. Fortunately for cross-browser scripters,
Netscape 6 implements <span class="literal">CSS2Properties</span> at least for
the element object <span class="literal">style</span> property.
</p>
</td>
</tr>
<tr>
<td valign="top" colspan="2" class="CLEARSEPARATION"> </td>
</tr>
<tr>
<td colspan="2"><p> The properties of the <span class="literal">style</span> object listed below
correspond to the CSS attributes. For more information on a
particular property, see the corresponding listing in Chapter 11.
</p>
</td>
</tr>
<tr>
<td valign="top" colspan="2" class="CLEARSEPARATION"> </td>
</tr>
<tr>
<td valign="top" colspan="2" class="objectmodelreference"><span class="title">Object Model Reference</span></td>
</tr>
<tr>
<td valign="top" colspan="2" class="CLEARSEPARATION"> </td>
</tr>
<tr>
<td>
<ul><li><span class="literal"></span><span class="literal">[window.]document.getElementById("</span><span class="replaceable">elementID</span><span class="literal">").style</span>
</li><li><span class="literal"></span><span class="literal">[window.]document.styleSheets[i].rules[j].style</span></li><li><span class="literal"></span><span class="literal">[window.]document.styleSheets[i].cssRules[j].style</span></li></ul>
</td>
</tr>
<tr>
<td valign="top" colspan="2" class="CLEARSEPARATION"> </td>
</tr>
<tr>
<td valign="top" colspan="2" class="objectspecificproperties"><span class="title">Object-Specific Properties</span></td>
</tr>
<tr>
<td valign="top" colspan="2" class="CLEARSEPARATION"> </td>
</tr>
<tr>
<td>
<table border="1"><tbody><tr><td><span class="literal">accelerator</span></td><td><span class="literal">azimuth</span></td><td><span class="literal">background</span></td>
</tr>
<tr><td><span class="literal">backgroundAttachment</span></td><td><span class="literal">backgroundColor</span></td><td><span class="literal">backgroundImage</span></td>
</tr>
<tr><td><span class="literal">backgroundPosition</span></td><td><span class="literal">backgroundPositionX</span></td><td><span class="literal">backgroundPositionY</span></td>
</tr>
<tr><td><span class="literal">backgroundRepeat</span></td><td><span class="literal">behavior</span></td><td><span class="literal">blockDirection</span></td>
</tr>
<tr><td><span class="literal">border</span></td><td><span class="literal">borderBottom</span></td><td><span class="literal">borderBottomColor</span></td>
</tr>
<tr><td><span class="literal">borderBottomStyle</span></td><td><span class="literal">borderBottomWidth</span></td><td><span class="literal">borderCollapse</span></td>
</tr>
<tr><td><span class="literal">borderColor</span></td><td><span class="literal">borderLeft</span></td><td><span class="literal">borderLeftColor</span></td>
</tr>
基于html的web开发的小游戏，适合初学者
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