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传入一个DOMString，表示要检查的属性名。
返回值
priority返回一个DOMString，表示属性对应的优先级。如果有的话，返回"important"；如果不存在的话，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';
Specifications
| Specification | Status | Comment |
|---|---|---|
| CSS Object Model (CSSOM) CSSStyleDeclaration.getPropertyPriority() |
Working Draft | |
| Document Object Model (DOM) Level 2 Style Specification CSSStyleDeclaration |
Obsolete |
Browser compatibility
We're converting our compatibility data into a machine-readable JSON format.
This compatibility table still uses the old format,
because we haven't yet converted the data it contains.
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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) |