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元httpEquiv物业

元对象参考 元对象

返回的HTTP标头在信息content属性:

var x = document.getElementsByTagName("META")[0].httpEquiv;

x的结果将是:

content-type
试一试»

定义和用法

该httpEquiv属性设置或返回在信息的HTTP标头content属性。

http-equiv属性可以用来模拟一个HTTP响应头。

该值http-equiv属性依赖于价值content属性。

注意:如果name属性设置,在http-equiv属性不应设置。


浏览器支持

Internet ExplorerFirefoxOperaGoogle ChromeSafari

该httpEquiv属性在所有主流浏览器的支持。


句法

返回httpEquiv属性:

metaObject .httpEquiv

设置httpEquiv属性:

metaObject .httpEquiv=HTTP-header

一些常用的HTTP标头值是:

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

更改HTTP-当量和内容属性的值。 下面的例子将刷新文档每30秒:

document.getElementsByTagName("META")[0].httpEquiv = "refresh";
document.getElementsByTagName("META")[0].content = "30";
试一试»

元对象参考 元对象