例
返回的HTTP標頭在信息content屬性:
var x = document.getElementsByTagName("META")[0].httpEquiv;
x的結果將是:
content-type
試一試» 定義和用法
該httpEquiv屬性設置或返回在信息的HTTP標頭content屬性。
在http-equiv屬性可以用來模擬一個HTTP響應頭。
該值http-equiv屬性依賴於價值content屬性。
注意:如果name屬性設置,在http-equiv屬性不應設置。
瀏覽器支持
該httpEquiv屬性在所有主流瀏覽器的支持。
句法
返回httpEquiv屬性:
metaObject .httpEquiv
設置httpEquiv屬性:
metaObject .httpEquiv=HTTP-header
一些常用的HTTP標頭值是:
Value | Description |
---|---|
content-type | Specifies the character set for the contents of the document. Tip:It is recommended to always specify the character set. Example: <meta http-equiv="content-type" content="text/html; charset=UTF-8"> |
default-style | Specifies the preferred style sheet to use. Example: <meta http-equiv="default-style" content=" the documents preferred stylesheet "> Note: The value of the content attribute above must match the value of the ttitle 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 . |
返回值
Type | Description |
---|---|
String | Information about the HTTP response message header |
更多示例
例
更改HTTP-當量和內容屬性的值。 下面的例子將刷新文檔每30秒:
document.getElementsByTagName("META")[0].httpEquiv = "refresh";
document.getElementsByTagName("META")[0].content = "30";
試一試» 元對象