Definition and Usage
用法

The <a> tag defines an anchor. An anchor can be used in two ways:
<a>标签能够定义锚点，锚点的用途有两种：

1. To create a link to another document by using the href attribute
   使用href属性来连接连到另一个文档
2. To create a bookmark inside a document, by using the name or id attribute
   通过使用name或id属性来建立一个文档内的书签

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Differences Between HTML and XHTML
它在HTML和XHTML中的区别

NONE
无

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Tips and Notes
注意以及提示

Note: A linked page is normally displayed in the current browser window, unless you specify another target.
注意：连接到的页面一般都是在原有的窗口中显示出来，除非你指定了其它的target属性值。

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Example
实例

Source	Output
<p>连接到 ruanchen: <a href="http://www.ruanchen.com"> ruanchen</a> </p> <p> 在新窗口中打开ruanchen: <a href="http://www.ruanchen.com" target="_blank">ruanchen</a> </p>	连接到ruanchen: ruanchen 在新窗口中打开ruanchen: ruanchen

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Optional Attributes
可选属性

DTD indicates in which DTD the attribute is allowed. S=Strict, T=Transitional, and F=Frameset.
DTD所允许的示意为：S=Strict[严密型], T=Transitional[过渡型], 以及 F=Frameset[框架型]

Attribute 属性	Value 值	Description 描述	DTD
charset	character_encoding	Specifies the character encoding of the target URL 指定目标URL的字符编码	STF
coords	if shape="rect" then coords="left,top,right,bottom" if shape="circ" then coords="centerx,centery,radius" if shape="poly" then coords="x1,y1,x2,y2,..,xn,yn"	Specifies the coordinates appropriate to the shape attribute to define a region of an image for image maps 为图片指定合适的坐标范围	STF
href	URL	The target URL of the link 连接的URL	STF
hreflang	language_code	Specifies the base language of the target URL 指定目标URL所使用的基本语言	STF
name	section_name	Names an anchor. Use this attribute to create a bookmark in a document. 锚点的命名。使用该属性可以建立文档的书签 In future versions of XHTML the name attribute will be replaced by the id attribute!! 在XHTML中name属性将被id属性所取代	STF
rel	alternate designates stylesheet start next prev contents index glossary copyright chapter section subsection appendix help bookmark	Specifies the relationship between the current document and the target URL 指定当前文档与目标URL之间的关系	STF
rev	alternate designates stylesheet start next prev contents index glossary copyright chapter section subsection appendix help bookmark	Specifies the relationship between the target URL and the current document 指定目标URL与之间当前文档的关系	STF
shape	rect rectangle circ circle poly polygon	Defines the type of region to be defined for mapping in the current area tag. Used with the coords attribute. 使用coords属性为当前区域的标签指定热点类型	STF
target	_blank _parent _self _top	Where to open the target URL. 如何打开目标URL _blank - the target URL will open in a new window 在新窗口打开 _self - the target URL will open in the same frame as it was clicked 在当前窗口(Frame)打开 _parent - the target URL will open in the parent frameset 在父级框架集中打开 _top - the target URL will open in the full body of the window 在当前窗口主体中打开	TF
type	mime_type	Specifies the MIME (Multipurpose Internet Mail Extensions) type of the target URL 指定目标URL的MIME(延伸性多用途网际邮件)类型	STF

Standard Attributes
标准属性

id, class, title, style, dir, lang, xml:lang, tabindex, accesskey

For a full description, go to Standard Attributes.
查看完整描述请前往标准属性参考

Event Attributes
事件属性

onfocus, onblur, onclick, ondblclick, onmousedown, onmouseup, onmouseover, onmousemove, onmouseout, onkeypress, onkeydown, onkeyup

For a full description, go to Event Attributes.
查看完整的相关描述，请前往事件属性参考

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Try-It-Yourself Demos
演示

Create hyperlinks
How to create hyperlinks.
建立超级连接

An image as a link
How to use an image as a link.
使用图片作为连接

Open a link in a new browser window
How to open a link in a new browser window, so that the visitor does not have to leave your Web site.
在新窗口打开连接

Link to a location on the same page
How to link to a bookmark.
连接到书签

Break out of a frame
How to break out of a frame (if your site is locked in a frame).
脱离框架

Create a mailto link
How to link to a mail message (will only work if you have mail installed).
建立邮件连接

Create a mailto link 2
Another mailto link.
另一种邮件连接

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