CSSStyleSheet

CSSStyleSheet interface represents a single CSS stylesheet, and lets you inspect and modify the list of rules contained in the stylesheet. It inherits properties and methods from its parent, StyleSheet .

A stylesheet consists of a collection of CSSRule objects representing each of the rules in the stylesheet. The rules are contained in a CSSRuleList , which can be obtained from the stylesheet's cssRules 特性。

For example, one rule might be a CSSStyleRule object containing a style such as:

h1, h2 {
  font-size: 16pt;
}
					

Another rule might be an at-rule such as @import or @media , and so forth.

注意事项 section for the various ways a CSSStyleSheet object can be obtained.

特性

Inherits properties from its parent, StyleSheet .

cssRules 只读

Returns a live CSSRuleList which maintains an up-to-date list of the CSSRule objects that comprise the stylesheet.

This is normally used to access individual rules like this:

styleSheet.cssRules[i] // where i = 0..cssRules.length-1
							

To add or remove items in cssRules , use the CSSStyleSheet 's insertRule() and deleteRule() 方法。

ownerRule 只读
If this stylesheet is imported into the document using an @import rule, the ownerRule property returns the corresponding CSSImportRule ; otherwise, this property's value is null .

方法

Inherits methods from its parent, StyleSheet .

deleteRule()
Deletes the rule at the specified index into the stylesheet's rule list.
insertRule()
Inserts a new rule at the specified position in the stylesheet, given the textual representation of the rule.

Legacy properties

These properties are legacy properties first introduced by Microsoft long ago; they shouldn't be used but are not likely to be removed anytime soon.

rules 只读
rules property is functionally identical to the standard cssRules property; it returns a live CSSRuleList which maintains an up-to-date list of all of the rules in the style sheet.

Legacy methods

These methods are legacy methods first introduced by Microsoft; they should not be used if they can be avoided, but are not in danger of being removed anytime soon.

addRule()

Adds a new rule to the stylesheet given the selector to which the style applies and the style block to apply to the matching elements.

This differs from insertRule() , which simply takes the textual representation of the entire rule as a single string.

removeRule()
Functionally identical to deleteRule() ; removes the rule at the specified index from the stylesheet's rule list.

注意事项

In some browsers, if a stylesheet is loaded from a different domain, accessing cssRules results in SecurityError .

A stylesheet is associated with at most one Document , which it applies to (unless disabled ). A list of CSSStyleSheet objects for a given document can be obtained using the document.styleSheets property. A specific style sheet can also be accessed from its owner object ( Node or CSSImportRule ), if any.

A CSSStyleSheet object is created and inserted into the document's Document.styleSheets list automatically by the browser, when a stylesheet is loaded for a document. As the stylesheet list cannot be modified directly, there's no useful way to create a new CSSStyleSheet object manually (although Constructable Stylesheet Objects is coming to the web platform soon and is already supported in Blink). To create a new stylesheet, insert a <style> or <link> element into the document.

A (possibly incomplete) list of ways a stylesheet can be associated with a document follows:

Reason for the style sheet to be associated with the document Appears in 文档。
styleSheets
list
Getting the owner element/rule given the style sheet object The interface for the owner object Getting the CSSStyleSheet object from the owner
<style> and <link> elements in the document Yes .ownerNode HTMLLinkElement ,
HTMLStyleElement ,
or SVGStyleElement
.sheet
CSS @import rule in other style sheets applied to the document Yes .ownerRule CSSImportRule .styleSheet
<?xml-stylesheet ?> processing instruction in the (non-HTML) document Yes .ownerNode ProcessingInstruction .sheet
HTTP Link Header Yes N/A N/A N/A
User agent (default) style sheets No N/A N/A N/A

规范

规范 状态 Comment
CSS Object Model (CSSOM)
The definition of 'CSSStyleSheet' in that specification.
工作草案
Document Object Model (DOM) Level 2 Style Specification
The definition of 'CSSStyleSheet' in that specification.
Obsolete 初始定义

浏览器兼容性

更新 GitHub 上的兼容性数据
Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
CSSStyleSheet Chrome Yes Edge 12 Firefox 1 IE 9 Opera Yes Safari Yes WebView Android Yes Chrome Android Yes Firefox Android 4 Opera Android Yes Safari iOS Yes Samsung Internet Android Yes
addRule()
弃用
Chrome Yes Edge 12 Firefox 68 IE 9 Opera Yes Safari Yes WebView Android Yes Chrome Android Yes Firefox Android 68 Opera Android Yes Safari iOS Yes Samsung Internet Android Yes
cssRules Chrome Yes Edge 12 Firefox 1 IE 9 Opera Yes Safari Yes WebView Android Yes Chrome Android Yes Firefox Android 4 Opera Android Yes Safari iOS Yes Samsung Internet Android Yes
deleteRule() Chrome Yes Edge 12 Firefox 1 IE 9 Opera Yes Safari Yes WebView Android Yes Chrome Android Yes Firefox Android 4 Opera Android Yes Safari iOS Yes Samsung Internet Android Yes
insertRule() Chrome Yes Edge 12 Firefox 1 IE 9 Opera Yes Safari Yes WebView Android Yes Chrome Android Yes Firefox Android 4 Opera Android Yes Safari iOS Yes Samsung Internet Android Yes
ownerRule Chrome Yes Edge 12 Firefox 1 IE 9 Opera Yes Safari Yes WebView Android Yes Chrome Android Yes Firefox Android 4 Opera Android Yes Safari iOS Yes Samsung Internet Android Yes
removeRule()
弃用
Chrome Yes Edge 12 Firefox 68 IE 9 Opera Yes Safari Yes WebView Android Yes Chrome Android Yes Firefox Android 68 Opera Android Yes Safari iOS Yes Samsung Internet Android Yes
rules
弃用
Chrome Yes Edge 12 Firefox 68 IE 9 Opera Yes Safari Yes WebView Android Yes Chrome Android Yes Firefox Android 68 Opera Android Yes Safari iOS Yes Samsung Internet Android Yes

图例

完整支持
完整支持
弃用。不要用于新网站。
弃用。不要用于新网站。

另请参阅