使用 Javascript 以字符串形式获取 HTML 的 DocType
[英]Get DocType of an HTML as string with Javascript
问题描述
I know that I can access to doctype object via document.doctype or document.childNodes[0] but my problem is getting doctype as a string.
我知道我可以通过document.doctype或document.childNodes[0]访问 doctype 对象，但我的问题是将 doctype 作为字符串获取。 I can do this in chrome and safari by calling document.doctype which returns <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> .我可以通过调用在Chrome和Safari做document.doctype其回报<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> 。 However in Firefox, calling document.doctype returns DocumentType object.但是在 Firefox 中，调用document.doctype返回 DocumentType 对象。
Is there a way to get the doctype string in all browsers as in chrome and safari?有没有办法像在 chrome 和 safari 中一样在所有浏览器中获取 doctype 字符串？
Thanks!谢谢！
5 个解决方案
解决方案1
77 已采纳 2012-04-15 13:14:57
In all compliant browsers (including Chrome/Safari), document.doctype also returns a DocumentType object.在所有兼容的浏览器（包括 Chrome/Safari）中， document.doctype也返回一个DocumentType对象。 The following code can be used to generate a valid DOCTYPE string.以下代码可用于生成有效的 DOCTYPE 字符串。
var node = document.doctype;
var html = "<!DOCTYPE "
+ node.name
+ (node.publicId ? ' PUBLIC "' + node.publicId + '"' : '')
+ (!node.publicId && node.systemId ? ' SYSTEM' : '')
+ (node.systemId ? ' "' + node.systemId + '"' : '')
+ '>';
This method returns the correct string for valid (HTML5) doctypes , eg:此方法返回有效 (HTML5) doctypes的正确字符串，例如：
-
<!DOCTYPE html> -
<!DOCTYPE html SYSTEM "about:legacy-compat"> -
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN" "http://www.w3.org/TR/REC-html40/strict.dtd">
Explanation of the code:代码说明：
node.name # Holds the name of the root element, eg: HTML / html
node.publicId # If this property is present, then it's a public document type.
#>Prefix PUBLIC
!node.publicId && node.systemId
# If there's no publicId, but a systemId, prefix SYSTEM
node.systemId # Append this if present
解决方案2
53 2015-01-08 11:22:59
You can also use this one liner to get the current doctype.您还可以使用这一行来获取当前的文档类型。 This will work in any modern browser and IE 9 and higher .这将适用于任何现代浏览器和 IE 9 及更高版本。
new XMLSerializer().serializeToString(document.doctype);
解决方案3
3 2012-05-02 07:36:12
function get_doctype()
{
var doctype =
'<!DOCTYPE ' +
document.doctype.name +
(document.doctype.publicId?' PUBLIC "' + document.doctype.publicId + '"':'') +
(document.doctype.systemId?' "' + document.doctype.systemId + '"':'') + '>';
return doctype;
}
解决方案4
1 2011-05-22 15:46:07
这就是你要找的吗？
alert(document.doctype.publicId);
解决方案5
1 2011-05-22 15:53:32
Concatenate DocumentType.name , .publicId and .systemId .连接DocumentType.name 、 .publicId和.systemId 。 Something like:就像是：
'<!DOCTYPE '+
DocumentType.name+' PUBLIC "'+ //maybe you should check for publicId first
DocumentType.publicId+'" "'+
DocumentType.systemId+'">'
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