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httpequiv

Meta httpEquiv 属性

定义和用法

httpEquiv 属性可设置或者返回 content 属性中HTTP 头部信息。

http-equiv 属性可以使用伪装 HTTP 响应头部信息。

http-equiv 属性值依赖 content属性的值。

注意：如果 name 属性已设置, http-equiv 属性就无需设置。

语法

设置 httpEquiv 属性：

linkObject.httpEquiv="HTTP-header"

返回 httpEquiv 属性：

linkObject.httpEquiv

一些常用的 HTTP-header 值:

值	描述
cache-control	Controls the caching mechanism to use for the document. Available values: public - cached in public shared caches private - cached in private cache no-cache - not cached no-store - cached but not archived 实例: <meta http-equiv="cache-control" content="no-cache">
content-language	Specifies the natural language(s) of the document (used by search engines to categorize pages by language). 实例: <meta http-equiv="content-language" content="en-US">
content-type	Specifies the character set for the contents of the document. Tip: It is recommended to always specify the character set. 实例: <meta http-equiv="content-type" content="text/html; charset=UTF-8">
date	Specifies the date and time when the page was created. 实例: <meta http-equiv="date" content="Wed, 16 Feb 2011 22:34:13 GMT">
expires	Specifies the date and time when the page will expire. 实例: <meta http-equiv="expires" content="Fri, 30 Dec 2011 12:00:00 GMT">
last-modified	Specifies the last modification date. 实例: <meta http-equiv="last-modified" content="Mon, 03 Jan 2011 17:45:57 GMT">
location	Redirects the visitor to another location. 实例: <meta http-equiv="location" content="URL=http://jiaocheng.bubufx.com">
refresh	Defines a time interval for the document to refresh itself. 实例: <meta http-equiv="refresh" content="300">
set-cookie	Creates a cookie with specified name,expires date and value. 实例: <meta http-equiv="set-cookie" content="w3scookie=myContent;expires=Fri, 30 Dec 2011 12:00:00 GMT; path=http://jiaocheng.bubufx.com">
window-target	Specifies the name of the frame where the current document must be loaded

浏览器支持

所有主要浏览器都支持 httpEquiv 属性

实例

显示 HTTP 头部信息:

<html>
<head>
<meta http-equiv="content-type" content="text/html;charset=utf-8">

<script>
function displayResult()
{
var x=document.getElementsByTagName("meta")[0].httpEquiv;
alert(x);
}
</script>

</head>
<body>

<button type="button" onclick="displayResult()">Display HTTP-Equiv</button>

</body>
</html>