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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>饭桶教程(kuaikuaixuan.com)</title> </head> <body> <p>如果时间早于 20:00，会获得问候 "Good day"。</p> <button onclick="myFunction()">点击这里</button> <p id="demo"></p> <script> function myFunction(){ var x=""; var time=new Date().getHours(); if (time<20){ x="Good day"; } document.getElementById("demo").innerHTML=x; } </script> </body> </html>
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