1 <!DOCTYPE html> 2 <html> 3 <head> 4 <meta charset="utf-8"> 5 <title>JavaScript动态显示年月日星期时分秒</title> 6 </head> 7 <body> 8 <h1 id="date_time"></h1> 9 <script type="text/javascript"> 10 function getweek(option){ 11 //第一种方法： 12 switch(option){ 13 case 0: 14 return"星期日"; 15 case 1: 16 return"星期一"; 17 case 2: 18 return"星期二"; 19 case 3: 20 return"星期三"; 21 case 4: 22 return"星期四"; 23 case 5: 24 return"星期五"; 25 case 6: 26 return"星期六"; 27 } 28 //第二种简便方法： 29 var week = "日一二三四五六".charAt(option); 30 return "星期"+week; 31 } 32 function showTime(){ 33 var dateTime = new Date(); 34 var year = dateTime.getFullYear(); 35 var month = dateTime.getMonth()+1; 36 month=month<10?"0"+month:month; 37 var date = dateTime.getDate(); 38 date=date<10?"0"+date:date; 39 var hour = dateTime.getHours(); 40 hour=hour<10?"0"+hour:hour; 41 var minute = dateTime.getMinutes(); 42 minute=minute<10?"0"+minute:minute; 43 var second = dateTime.getSeconds(); 44 second=second<10?"0"+second:second; 45 var week = getweek(dateTime.getDay()); 46 datetime = year+"年"+month+"月"+date+"日"+" "+ week+ " " +hour+":"+minute+":"+second 47 document.getElementById("date_time").innerHTML=datetime; 48 } 49 setInterval("showTime()",1000)//间隔多少毫秒 50 </script> 51 </body> 52 </html>
原文：https://www.cnblogs.com/fengxiaoying/p/14849402.html