JavaScript navigator 对象包含一个名为 plugins 的子对象。该对象是一个数组，在浏览器上安装的每个插件都有一个记录。仅Netscape，Firefox和Mozilla支持navigator.plugins对象。
这是一个示例，显示了如何列出浏览器中安装的所有插件-
<html>
<head>
<title>List of Plug-Ins</title>
</head>
<body>
<table border="1">
<tr>
<th>Plug-in Name</th>
<th>Filename</th>
<th>Description</th>
</tr>
</span><span class="tag"><script</span><span class="pln"> </span><span class="atn">language</span><span class="pun">=</span><span class="atv">"JavaScript"</span><span class="pln"> </span><span class="atn">type</span><span class="pun">=</span><span class="atv">"text/javascript"</span><span class="tag">></span><span class="pln">
</span><span class="kwd">for</span><span class="pln"> </span><span class="pun">(</span><span class="pln">i</span><span class="pun">=</span><span class="lit">0</span><span class="pun">;</span><span class="pln"> i</span><span class="pun"><</span><span class="pln">navigator</span><span class="pun">.</span><span class="pln">plugins</span><span class="pun">.</span><span class="pln">length</span><span class="pun">;</span><span class="pln"> i</span><span class="pun">++)</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
document</span><span class="pun">.</span><span class="pln">write</span><span class="pun">(</span><span class="str">"<tr><td>"</span><span class="pun">);</span><span class="pln">
document</span><span class="pun">.</span><span class="pln">write</span><span class="pun">(</span><span class="pln">navigator</span><span class="pun">.</span><span class="pln">plugins</span><span class="pun">[</span><span class="pln">i</span><span class="pun">].</span><span class="pln">name</span><span class="pun">);</span><span class="pln">
document</span><span class="pun">.</span><span class="pln">write</span><span class="pun">(</span><span class="str">"</td><td>"</span><span class="pun">);</span><span class="pln">
document</span><span class="pun">.</span><span class="pln">write</span><span class="pun">(</span><span class="pln">navigator</span><span class="pun">.</span><span class="pln">plugins</span><span class="pun">[</span><span class="pln">i</span><span class="pun">].</span><span class="pln">filename</span><span class="pun">);</span><span class="pln">
document</span><span class="pun">.</span><span class="pln">write</span><span class="pun">(</span><span class="str">"</td><td>"</span><span class="pun">);</span><span class="pln">
document</span><span class="pun">.</span><span class="pln">write</span><span class="pun">(</span><span class="pln">navigator</span><span class="pun">.</span><span class="pln">plugins</span><span class="pun">[</span><span class="pln">i</span><span class="pun">].</span><span class="pln">description</span><span class="pun">);</span><span class="pln">
document</span><span class="pun">.</span><span class="pln">write</span><span class="pun">(</span><span class="str">"</td></tr>"</span><span class="pun">);</span><span class="pln">
</span><span class="pun">}</span><span class="pln">
</span><span class="tag"></script></span><span class="pln">
</span><span class="tag"></table></span><span class="pln">
</body>
</html>
运行上面代码输出
检查插件
每个插件在数组中都有一个条目。每个条目具有以下属性-
name - 是插件的名称。
filename - 是为安装插件而加载的可执行文件。
description - 是开发人员提供的插件描述。
mimeTypes - 是一个数组，对于插件支持的每种MIME类型，都有一个条目。
您可以在脚本中使用这些属性来查找已安装的插件，然后使用JavaScript来播放适当的多媒体文件，看下面的示例。
<html>
<head>
<title>Using Plug-Ins</title>
</head>
<body>
<script language="JavaScript" type="text/javascript">
media=navigator.mimeTypes["video/quicktime"];
</span><span class="kwd">if</span><span class="pln"> </span><span class="pun">(</span><span class="pln">media</span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
document</span><span class="pun">.</span><span class="pln">write</span><span class="pun">(</span><span class="str">"<embed src=quick.mov height=100 width=100>"</span><span class="pun">);</span><span class="pln">
</span><span class="pun">}</span><span class="pln"> </span><span class="kwd">else</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
document</span><span class="pun">.</span><span class="pln">write</span><span class="pun">(</span><span class="str">"<img src=quick.gif height=100 width=100>"</span><span class="pun">);</span><span class="pln">
</span><span class="pun">}</span><span class="pln">
</span><span class="tag"></script></span><span class="pln">
</body>
</html>
运行上面代码输出
注意-这里无涯教程使用HTML <embed>标签嵌入多媒体文件。
控制多媒体
举一个几乎可以在所有浏览器中使用-
<html>
<head>
<title>Using Embeded Object</title>
</span><span class="tag"><script</span><span class="pln"> </span><span class="atn">type</span><span class="pun">=</span><span class="atv">"text/javascript"</span><span class="tag">></span><span class="pln">
</span><span class="pun"><!--</span><span class="pln">
</span><span class="kwd">function</span><span class="pln"> play</span><span class="pun">()</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
</span><span class="kwd">if</span><span class="pln"> </span><span class="pun">(!</span><span class="pln">document</span><span class="pun">.</span><span class="pln">demo</span><span class="pun">.</span><span class="typ">IsPlaying</span><span class="pun">())</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
document</span><span class="pun">.</span><span class="pln">demo</span><span class="pun">.</span><span class="typ">Play</span><span class="pun">();</span><span class="pln">
</span><span class="pun">}</span><span class="pln">
</span><span class="pun">}</span><span class="pln">
</span><span class="kwd">function</span><span class="pln"> stop</span><span class="pun">()</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
</span><span class="kwd">if</span><span class="pln"> </span><span class="pun">(</span><span class="pln">document</span><span class="pun">.</span><span class="pln">demo</span><span class="pun">.</span><span class="typ">IsPlaying</span><span class="pun">())</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
document</span><span class="pun">.</span><span class="pln">demo</span><span class="pun">.</span><span class="typ">StopPlay</span><span class="pun">();</span><span class="pln">
</span><span class="pun">}</span><span class="pln">
</span><span class="pun">}</span><span class="pln">
</span><span class="kwd">function</span><span class="pln"> rewind</span><span class="pun">()</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
</span><span class="kwd">if</span><span class="pln"> </span><span class="pun">(</span><span class="pln">document</span><span class="pun">.</span><span class="pln">demo</span><span class="pun">.</span><span class="typ">IsPlaying</span><span class="pun">())</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
document</span><span class="pun">.</span><span class="pln">demo</span><span class="pun">.</span><span class="typ">StopPlay</span><span class="pun">();</span><span class="pln">
</span><span class="pun">}</span><span class="pln">
document</span><span class="pun">.</span><span class="pln">demo</span><span class="pun">.</span><span class="typ">Rewind</span><span class="pun">();</span><span class="pln">
</span><span class="pun">}</span><span class="pln">
</span><span class="com">//--></span><span class="pln">
</span><span class="tag"></script></span><span class="pln">
</head>
<body>
<embed id="demo" name="demo"
src="www.amrood.com/games/kumit…"
width="318" height="300" play="false" loop="false"
pluginspage="www.macromedia.com/go/getflash…"
swliveconnect="true">
</span><span class="tag"><form</span><span class="pln"> </span><span class="atn">name</span><span class="pun">=</span><span class="atv">"form"</span><span class="pln"> </span><span class="atn">id</span><span class="pun">=</span><span class="atv">"form"</span><span class="pln"> </span><span class="atn">action</span><span class="pun">=</span><span class="atv">"#"</span><span class="pln"> </span><span class="atn">method</span><span class="pun">=</span><span class="atv">"get"</span><span class="tag">></span><span class="pln">
</span><span class="tag"><input</span><span class="pln"> </span><span class="atn">type</span><span class="pun">=</span><span class="atv">"button"</span><span class="pln"> </span><span class="atn">value</span><span class="pun">=</span><span class="atv">"Start"</span><span class="pln"> </span><span class="atn">onclick</span><span class="pun">=</span><span class="atv">"</span><span class="pln">play</span><span class="pun">();</span><span class="atv">"</span><span class="pln"> </span><span class="tag">/></span><span class="pln">
</span><span class="tag"><input</span><span class="pln"> </span><span class="atn">type</span><span class="pun">=</span><span class="atv">"button"</span><span class="pln"> </span><span class="atn">value</span><span class="pun">=</span><span class="atv">"Stop"</span><span class="pln"> </span><span class="atn">onclick</span><span class="pun">=</span><span class="atv">"</span><span class="pln">stop</span><span class="pun">();</span><span class="atv">"</span><span class="pln"> </span><span class="tag">/></span><span class="pln">
</span><span class="tag"><input</span><span class="pln"> </span><span class="atn">type</span><span class="pun">=</span><span class="atv">"button"</span><span class="pln"> </span><span class="atn">value</span><span class="pun">=</span><span class="atv">"Rewind"</span><span class="pln"> </span><span class="atn">onclick</span><span class="pun">=</span><span class="atv">"</span><span class="pln">rewind</span><span class="pun">();</span><span class="atv">"</span><span class="pln"> </span><span class="tag">/></span><span class="pln">
</span><span class="tag"></form></span><span class="pln">
</body>
</html>
运行上面代码输出
