备注:
1). 像href=”www.163.com“的写法是错误的，必须改为href="http://www.163.com"
2). 如果href属性的值以/开头，则表示相对于服务器的根目录，如果没有则表示相对于当前页面

二、HTML中的target属性：

With the target attribute, you can define where the linked document will be opened.

<a href="http://www.w3schools.com/" target="_blank">Visit W3Schools!</a>

三、HTML中的name属性：

The name attribute is used to create a named anchor. When using named anchors we can create links that can jump directly into a specific section on a page, instead of letting the user scroll around to find what he/she is looking for.

You should notice that a named anchor is not displayed in a special way.To link directly to the "tips" section, add a # sign and the name of the anchor to the end of a URL.

<a name="tips">Useful Tips Section</a>

备注：
一个被锚标记标注的文本并不会有什么特别的显示，要想使用锚标记进行页间跳转，只需要在URL的末尾加上一个#号和锚标记的名称就可以了。如果是进行页内跳转则简单地使用#号加锚标记的名称就可以了(连URL都不用了)。

<a href="http://www.w3schools.com/html_links.asp#tips">
    Jump to the Useful Tips Section
</a>

<a href="#tips">Jump to the Useful Tips Section</a>

四、关于超链接的一些注意点：

Always add a trailing slash to subfolder references. If you link like this: href="http://www.w3schools.com/html", you will generate two HTTP requests to the server, because the server will add a slash to the address and create a new request like this: href="http://www.w3schools.com/html/"

Named anchors are often used to create "table of contents" at the beginning of a large document. Each chapter within the document is given a named anchor, and links to each of these anchors are put at the top of the document.