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Meta httpEquiv 屬性
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定義和用法
httpEquiv 屬性可設(shè)置或者返回 content 屬性中HTTP 頭部信息。
http-equiv 屬性可以使用偽裝 HTTP 響應(yīng)頭部信息。
http-equiv 屬性值依賴 content屬性的值。
注意：如果 name 屬性已設(shè)置, http-equiv 屬性就無(wú)需設(shè)置。
語(yǔ)法
設(shè)置 httpEquiv 屬性：
返回 httpEquiv 屬性：
一些常用的 HTTP-header 值:
| 值 | 描述 |
|---|---|
| cache-control | Controls the caching mechanism to use for the document.
Available values:
實(shí)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).
實(shí)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. 實(shí)例: <meta http-equiv="content-type" content="text/html; charset=UTF-8"> |
| date | Specifies the date and time when the page was created.
實(shí)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.
實(shí)例: <meta http-equiv="expires" content="Fri, 30 Dec 2011 12:00:00 GMT"> |
| last-modified | Specifies the last modification date.
實(shí)例: <meta http-equiv="last-modified" content="Mon, 03 Jan 2011 17:45:57 GMT"> |
| location | Redirects the visitor to another location.
實(shí)例: <meta http-equiv="location" content="URL=http://o2fo.com"> |
| refresh | Defines a time interval for the document to refresh itself.
實(shí)例: <meta http-equiv="refresh" content="300"> |
| set-cookie | Creates a cookie with specified name,expires date and value.
實(shí)例: <meta http-equiv="set-cookie" content="w3scookie=myContent;expires=Fri, 30 Dec 2011 12:00:00 GMT; path=http://o2fo.com"> |
| window-target | Specifies the name of the frame where the current document must be loaded |
瀏覽器支持
所有主要瀏覽器都支持 httpEquiv 屬性
實(shí)例
實(shí)例
顯示 HTTP 頭部信息:
<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>
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Meta 對(duì)象
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