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Tryit: JAVASCRIPT
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<!DOCTYPE html> <html> <body> <p>显示“早上好！” 如果时间小于 18:00：</p> <p id="demo">晚上好！</p> <script> if (new Date().getHours() < 18) { document.getElementById("demo").innerHTML = "Good day!"; } </script> </body> </html>