Web Front-endHTML TutorialA good memory is not as good as a bad writing 62-meta attributes and meanings in HTML_html/css_WEB-ITnose
Recently, I have to learn about some meta things in HTML. Many things are unclear. I searched online and found that many of them are wrong. I might as well sort them out myself.
meta是用来在HTML文档中模拟HTTP协议的响应头报文。 meta 标签用于网页的<head>与</head>之间，meta 标签的用处很多。meta 的属性有两种：name和http- equiv。name属性主要用于描述网页，对应于content（网页内容），以便于搜索引擎机器人查找、分类（目前主流搜索引擎都使用网上机器人自动查找meta值来给网页分类）。这其中最重要的是description（站点的描述）和keywords（站点的分类），一般建议应该给每页加一个meta值。比较常用的有以下几个： name 属性 1、<meta name="Generator" content="">用以说明生成工具（如Microsoft FrontPage 4.0）等； 2、<meta name="KEYWords" content ="">向搜索引擎说明你的网页的关键词； 3、<meta name="DEscription" content ="">告诉搜索引擎你的站点的主要内容； 4、<meta name="Author" content ="你的姓名">告诉搜索引擎你的站点的制作的作者； 5、<meta name="Robots" content = "all|none|index|noindex|follow|nofollow"> 其中的属性说明如下： 设定为all：文件将被检索，且页面上的链接可以被查询； 设定为none：文件将不被检索，且页面上的链接不可以被查询； 设定为index：文件将被检索； 设定为follow：页面上的链接可以被查询； 设定为noindex：文件将不被检索，但页面上的链接可以被查询； 设定为nofollow：文件将不被检索，页面上的链接可以被查询。 http-equiv属性 1、<meta http-equiv="Content-Type" content ="text/html";charset=gb_2312-80"> 和 <meta http-equiv="Content-Language" content ="zh-CN">用以说明主页制作所使用的文字以及语言； 又如英文是ISO-8859-1字符集，还有BIG5、utf-8、shift-Jis、Euc、Koi8-2等字符集； 2、<meta http-equiv="Refresh" content ="n;url=http://www.yourlink">定时让网页在指定的时间n内，跳转到页面http://www.yourlink； 3、<meta http-equiv="Expires" content ="Mon,12 May 2012 00:10:00 GMT">可以用于设定网页的到期时间，一旦过期则必须到服务器上重新调用。需要注意的是必须使用GMT时间格式； 4、<meta http-equiv="Pragma" content ="no-cache">是用于设定禁止浏览器从本地机的缓存中调阅页面内容，设定后一旦离开网页就无法从Cache中再调出； 5、<meta http-equiv="set-cookie" content =" Mon,12 May 2012 00:10:00 GMT ">cookie设定，如果网页过期，存盘的cookie将被删除。需要注意的也是必须使用GMT时间格式； 6、<meta http-equiv="Pics-label" content =""& gt;网页等级评定，在IE的internet选项中有一项内容设置，可以防止浏览一些受限制的网站，而网站的限制级别就是逼br />?过meta属性来设置的； 7、<meta http-equiv="windows-Target" content ="_top">强制页面在当前窗口中以独立页面显示，可以防止自己的网页被别人当作一个frame页调用； 8、<meta http-equiv="Page-Enter" content ="revealTrans(duration=10,transtion= 50)">和<meta http-equiv="Page-Exit" content ="revealTrans(duration=20，transtion=6)">设定进入和离开页面时的特殊效果，这个功能即FrontPage中的“格式/网页过渡”，不过所加的页面不能够是一个frame页面。
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