CSSStyleDeclaration.getPropertyPriority() 方法会根据传入的CSS属性，返回一个 DOMString 来表示该属性的优先级。
Syntax
var priority = style.getPropertyPriority(property);
参数
property是一个DOMString，表示要检查的属性名。
返回值
priority是一个DOMString，用以表示属性优先级。存在，就返回（例如："important"）；不存在，则返回空字符串。
例子
下面的代码检查了margin，在CSS规则中是否被设置为 important 优先级。
var declaration = document.styleSheets[0].cssRules[0].style;
var isImportant = declaration.getPropertyPriority('margin') === 'important';
标准
| Specification | Status | Comment |
|---|---|---|
| CSS Object Model (CSSOM) CSSStyleDeclaration.getPropertyPriority() |
Working Draft | |
| Document Object Model (DOM) Level 2 Style Specification CSSStyleDeclaration |
Obsolete |
浏览器兼容性
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| Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
|---|---|---|---|---|---|---|
| Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
| Feature | Android | Edge | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile | Chrome for Android |
|---|---|---|---|---|---|---|---|
| Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |