HTML DOM Meta httpEquiv 属性
Meta httpEquiv 属性
Meta 对象
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：
返回 httpEquiv 属性：
一些常用的 HTTP-header 值:
| 值 | 描述 |
|---|---|
| cache-control | Controls the caching mechanism to use for the document.
Available values:
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://www.w3cschool.cn"> |
| 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://www.w3cschool.cn"> |
| 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
实例
显示 HTTP 头部信息:
<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>
尝试一下 »
Meta 对象