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<!DOCTYPE html> <html> <body> <p>单击该按钮可查看屏幕/视口的宽度是小于还是大于 700 像素。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("demo"); if (window.matchMedia("(max-width: 700px)").matches) { x.innerHTML = "屏幕小于或等于 700 像素宽。"; } else { x.innerHTML = "屏幕至少有 700 像素宽。"; } } </script> </body> </html>