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• 描述
• 范例
• 另请参阅
• 规范
• 浏览器兼容性
• 相关话题

A CSSRuleList is an (indirect-modify only) array-like object containing an ordered collection of CSSRule 对象。

描述

每个 CSSRule can be accessed as rules .item( index ), or simply rules [ index ] ，其中 rules 是对象实现 CSSRuleList interface (such as CSSStylesheet .cssRules )，和 index is the 0-based index of the rule, in the order as it appears in the style sheet CSS. The number of rules in the list is rules .length .

Note that being indirect-modify ( changeable but only having read-methods), rules are NOT added or removed from the list directly, but instead here, only via its parent stylesheet. In fact, .insertRule() and .deleteRule() are not even methods of CSSRuleList, but only of CSSStyleSheet . If however, for some reason the list does need to be modified but has no parent stylesheet (perhaps being a livecopy of a list that does), it cannot just be assigned one (as it has no such property ), and neither can it be assigned to one (as stylesheet.css Rules is 只读 ), but it must unfortunately be inserted into one, rule by rule, and unless combining lists, after any existing list therein is deleted, rule by rule.

范例

// get the first style sheet’s first rule
var first_rule = document.styleSheets[0].cssRules[0];
					

另请参阅

• CSSRule

CSSRuleList implementations

There are multiple properties in the CSSOM that will return a CSSRuleList . They are:

• CSSStyleSheet property cssRules
• CSSMediaRule property cssRules
• CSSKeyframesRule property cssRules
• CSSMozDocumentRule property cssRules

规范

规范	状态	注释
CSS Object Model (CSSOM) The definition of 'CSSRuleList' in that specification.	工作草案

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
CSSRuleList	Chrome 1	Edge ≤18	Firefox 1	IE ?	Opera Yes	Safari Yes	WebView Android Yes	Chrome Android Yes	Firefox Android 4	Opera Android Yes	Safari iOS Yes	Samsung Internet Android Yes
item	Chrome 1	Edge 12	Firefox 1	IE ?	Opera Yes	Safari Yes	WebView Android Yes	Chrome Android Yes	Firefox Android 4	Opera Android Yes	Safari iOS Yes	Samsung Internet Android Yes
length	Chrome 1	Edge 12	Firefox 25	IE ?	Opera Yes	Safari Yes	WebView Android Yes	Chrome Android Yes	Firefox Android 25	Opera Android Yes	Safari iOS Yes	Samsung Internet Android Yes

图例

完整支持

完整支持

兼容性未知 ?

兼容性未知

元数据

• 最后修改： Jan 2, 2020

相关话题

1. CSS Object Model
2. CSSRuleList
3. Related pages for CSSOM

   1. AnimationEvent
   2. CSS
   3. CSSConditionRule
   4. CSSGroupingRule
   5. CSSKeyframeRule
   6. CSSKeyframesRule
   7. CSSMediaRule
   8. CSSNamespaceRule
   9. CSSPageRule
   10. CSSRule
   11. CSSStyleDeclaration
   12. CSSStyleRule
   13. CSSStyleSheet
   14. CSSSupportsRule
   15. CaretPosition
   16. LinkStyle
   17. MediaQueryList
   18. MediaQueryListListener
   19. Screen
   20. StyleSheet
   21. StyleSheetList
   22. TransitionEvent