文档介绍：让搜索引擎搜索到自己网站的方法
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 这就是META标签的典型应用，标识page所采用的编码类型。根据HTML语言标准注释：META标签是对网站开展非常重要的标签，它可以用于鉴别作者，设定页面格式，标注内容提要和关键字，以及刷新页面等等。
详细介绍
 META标签分两大局部：HTTP-EQUIV和NAME变量。
参数HTTP-EQUIV
HTTP-EQUIV类似于HTTP的头部协议，它给浏览器回应一些有用的信息，以帮助正确地显示网页内容。常用的HTTP-EQUIV类型有：
A. Expires(期限)
说明：可以用于设定网页的到期时间。一旦网页过期，必须到效劳器上重新调阅。
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several group number, then with b ± a, =c,c is is methyl b two vertical box between of accurate size. Per-2~3 measurement, such as proceeds of c values are equal and equal to the design value, then the vertical installation accurate. For example a, b, and c valueswhile on horizontal vertical errors for measurement, General in iron angle code bit at measurement level points grid errors, specific method is from baseli