1. 说明
| Value | Description |
|---|---|
| content-type | Specifies the character encoding for the document.
Example: <meta http-equiv="content-type" content="text/html; charset=UTF-8"> |
| default-style | Specified the preferred style sheet to use.
Example: <meta http-equiv="default-style" content="the document's preferred stylesheet"> Note: The value of the content attribute above must match the value of the title attribute on a link element in the same document, or it must match the value of the title attribute on a style element in the same document. |
| refresh | Defines a time interval for the document to refresh itself.
Example: <meta http-equiv="refresh" content="300"> Note: The value "refresh" should be used carefully, as it takes the control of a page away from the user. Using "refresh" will cause a failure in W3C's Web Content Accessibility Guidelines. |
2. 价值
声明http 响应首部开始标志，可以避免加载无效请求，同时可以做一个简单的控制比如refresh