MediaQueryListEvent: matches 属性
matches
是 MediaQueryListEvent
接口的只读属性,是一个布尔值,如果 document
当前匹配媒体查询列表,则为 true
,否则为 false
。
值
布尔值;如果 document
当前匹配媒体查询列表,则返回 true
,否则返回 false
。
示例
js
const para = document.querySelector("p"); // This is the UI element where to display the text
const mql = window.matchMedia("(max-width: 600px)");
mql.addEventListener("change", (event) => {
if (event.matches) {
// The viewport is 600 pixels wide or less
para.textContent = "This is a narrow screen — less than 600px wide.";
document.body.style.backgroundColor = "red";
} else {
// The viewport is more than 600 pixels wide
para.textContent = "This is a wide screen — more than 600px wide.";
document.body.style.backgroundColor = "blue";
}
});
规范
规范 |
---|
CSSOM 视图模块 # dom-mediaquerylistevent-matches |
浏览器兼容性
BCD 表格仅在浏览器中加载