如何使用 JavaScript 来使用媒体查询?

javascriptweb developmentobject oriented programming更新于 2025/12/16 19:56:17

要使用 JavaScript 来使用媒体查询，代码如下 −

示例

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1" />
<style>
   body {
      font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
      color: white;
      padding: 20px;
   }
</style>
</head>
<body>
<h1>Using media queries with JavaScript Example</h1>
<h2>Resize the screen to see the color change from blue to red</h2>
<script>
   var mediaQuery = window.matchMedia("(max-width: 700px)");
   function setColor(mediaQuery) {
      if (mediaQuery.matches) {
         document.body.style.backgroundColor = "red";
      } else {
         document.body.style.backgroundColor = "blue";
      }
   }
   setColor(mediaQuery);
   mediaQuery.addListener(myFunction);
</script>
</body>
</html>