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<a href = "../index.html"><H1>网站首页</H1></a>
<a href = "index.html" ><H1>HTML元素参考</H1></a><a href = "../html_attr_ref/index.html" ><H1>HTML属性参考</H1></a>
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<H2>定义</H2><P>指定一个显式 URL 用于解析对于外部源的链接和引用，如图像和样式表。</P><P>Specifies an explicit URL used to resolve links and references to external sources such as images and style sheets.</P><H2>元素说明</H2><P>当使用时，base 元素必须出现在文档的 head 内，在任何用于引用外部资源的元素之前。</P><P>此元素在 Internet Explorer 3.0 及以上版本的 HTML 中可用，在 Internet Explorer 4.0 及以上版本的脚本中可用。</P><P>此元素不改变内容的显示格式。</P><P>此元素不需要关闭标签。</P><P>When used, the base element must appear within the head of the document, before any elements that refer to an external source.</P><P>This element is available in HTML as of Internet Explorer 3.0, and in script as of Internet Explorer 4.0.</P><P>This element is not rendered.</P><P>This element does not require a closing tag.</P><H2>示例代码</H2><P>下面的例子设置了文档的基础 URL 到一个引用文件夹。Internet Explorer 使用 base 元素来解析指向 <A href="http://msdn.microsoft.com/workshop/author/dhtml/reference/properties/href_2.html">http://msdn.microsoft.com/workshop/author/dhtml/reference/properties/href_2.html</A> 的链接。</P><P>This example sets the base URL of the document to a reference folder. Internet Explorer uses the base element to resolve the link to <A href="http://msdn.microsoft.com/workshop/author/dhtml/reference/properties/href_2.asp">http://msdn.microsoft.com/workshop/author/dhtml/reference/properties/href_2.asp</A>.</P><PRE><HTML></PRE><PRE><HEAD></PRE><PRE> <BASE HREF="<A href='http://msdn.microsoft.com/workshop/author/dhtml/reference/"/'>http://msdn.microsoft.com/workshop/author/dhtml/reference/"/</A>></PRE><PRE></HEAD></PRE><PRE> </PRE><PRE><BODY></PRE><PRE>Click <A HREF="properties/href_2.asp">here</A> to learn about the </PRE><PRE>href property.</PRE><PRE></BODY></PRE><PRE></HTML></PRE><P> </P><P>下面的例子表示，如在文档中指定了合法的 base 元素，则从文档中获取基础 URL；反之，返回 null。</P><P>This example retrieves the base URL from the document if a valid base element is specified in the document. Otherwise, the function returns null. </P><PRE><SCRIPT></PRE><PRE>function GetBase()</PRE><PRE>{</PRE><PRE> var oBaseColl = document.all.tags('BASE');</PRE><PRE> return ( (oBaseColl && oBaseColl.length) ? oBaseColl[0].href : </PRE><PRE> null );</PRE><PRE>}</PRE><PRE></SCRIPT></PRE><P> </P>
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<p><a href="../index.html">布啦布啦网页教程与代码</a></p>
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