MediaList: toString() 方法
MediaList 接口的 toString() 字符串转换器 方法返回一个表示该对象值的字符串。该值是以与 MediaList.mediaText 属性相同的格式逗号分隔的媒体值列表。
语法
js
toString()
参数
无。
返回值
字符串。
示例
js
const firstStyleSheet = document.styleSheets[0]; // the document's first stylesheet
const mediaList = firstStyleSheet.media; // the mediaList of the stylesheet
// set the `media` text to a media query value
mediaList.mediaText = "SCREEN AND (140PX <= WIDTH <= 380PX)";
// add a second media value
mediaList.appendMedium("SCREEN AND (ORIENTATION: LANDSCAPE))");
// erroneously, add the same media query again
mediaList.appendMedium("SCREEN AND (ORIENTATION: LANDSCAPE))");
console.log(mediaList.toString());
// "screen and (140px <= width <= 380px), screen and (orientation: landscape)"
规范
| 规范 |
|---|
| CSS 对象模型 (CSSOM) # MediaList-stringification-behavior |
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