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<!DOCTYPE html> <html> <head> <meta name="viewport" content="width=device-width, initial-scale=1"> </head> <body> <h1>通过 JavaScript 实现全屏</h1> <p>请单击“打开全屏”按钮，以全屏模式打开此页面。可通过单击键盘上的“Esc”键或“关闭全屏”按钮将其关闭。</p> <button onclick="openFullscreen();">打开全屏</button> <button onclick="closeFullscreen();">关闭全屏</button> <script> var elem = document.documentElement; function openFullscreen() { if (elem.requestFullscreen) { elem.requestFullscreen(); } else if (elem.webkitRequestFullscreen) { /* Safari */ elem.webkitRequestFullscreen(); } else if (elem.msRequestFullscreen) { /* IE11 */ elem.msRequestFullscreen(); } } function closeFullscreen() { if (document.exitFullscreen) { document.exitFullscreen(); } else if (document.webkitExitFullscreen) { /* Safari */ document.webkitExitFullscreen(); } else if (document.msExitFullscreen) { /* IE11 */ document.msExitFullscreen(); } } </script> <p>注释：Internet Explorer 10 及更早版本不支持全屏模式。</p> </body> </html>