在这里插入代码片 ```<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>分时问候</title> </head> <body> <div> <img src="上午好.gif" alt="" id="tp"> </div> <script> var today = new Date("2019-6-15 12:00"); //document.write(today);括号里面可以设置时间，如果不写，则为默认时间 var today = new Date(); var time = today.getHours(); var aa = document.getElementById("tp") if (time>=0 && time<12){ aa.src="1.gif" document.write('亲，上午好，好好写代码') }else if(time>=12 && time<18){ aa.src="2.gif" document.write('亲，下午好，好好写代码') }else{ aa.src="3.gif" document.write('亲，晚上好，好好写代码') } </script> </body> </html>
