主页
JavaScript
JavaScript 代码块
tryjs_ifthenelse
运行 ❯
×
更改方向
保存代码
更改主题
<!DOCTYPE html> <html> <body> <p>单击该按钮以显示基于时间的问候语：</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var hour = new Date().getHours(); var greeting; if (hour < 18) { greeting = "Good day"; } else { greeting = "Good evening"; } document.getElementById("demo").innerHTML = greeting; } </script> </body> </html>