一.获取日期时间，秒数实时跳动
1 <!DOCTYPE html> 2 <html lang="en"> 3 <head> 4 <meta charset="UTF-8"> 5 <title>date01</title> 6 <style> 7 #date{ 8 position: absolute; 9 font-size: 30px; 10 font-family: '微软雅黑'; 11 top:50%; 12 left:50%; 13 -webkit-transform:translate(-50%,-50%); 14 } 15 </style> 16 </head> 17 <body> 18 <div id="date">2017.10.29</div> 19 <script> 20 window.onload = function(){ 21 showTime(); 22 } 23 //checkTime(i)对分钟和秒进行判断，如果小于10，在其前补0. 24 function checkTime(i){ 25 return i < 10? "0"+i:i; 26 } 27 function showTime(){ 28 var time = new Date();//日期对象 29 console.log("new Date :"+time); 30 var year_1 = time.getYear();//获得年份 31 console.log("getYear(): "+year_1); 32 var year_2 = time.getFullYear();//获得完整年份 33 console.log("getFullYear(): "+year_2); 34 var month = time.getMonth();//获得月份(0~11) 35 console.log("getMonth(): "+month); 36 var date = time.getDate();//获得日期(1~31) 37 console.log("getDate(): "+date); 38 var day = time.getDay();//星期几(0~6) 39 console.log("getDay(): "+day) 40 var hours = time.getHours();//小时(0~23) 41 console.log("getHours(): "+hours); 42 var min = time.getMinutes();//分钟(0~59) 43 console.log("getMinutes(): "+min); 44 var seconds = time.getSeconds();//秒 45 console.log("getSeconds(): "+seconds); 46 47 min = checkTime(min); 48 seconds = checkTime(seconds); 49 50 var weekday = new Array(7); 51 weekday[0] = "星期天"; 52 weekday[1] = "星期一"; 53 weekday[2] = "星期二"; 54 weekday[3] = "星期三"; 55 weekday[4] = "星期四"; 56 weekday[5] = "星期五"; 57 weekday[6] = "星期六"; 58 59 var str_time = year_2 + "年" + (month+1) + "月" + date + "日" +" "+ weekday[day] +" "+ hours +":" + min +":" + seconds; 60 61 document.getElementById('date').innerHTML = str_time; 62 setTimeout(showTime,500);//每500ms执行一次，实现秒数实时跳动。 63 } 64 65 </script> 66 </body> 67 </html>
二.高考倒计时功能（天）
1 <!DOCTYPE html> 2 <html lang="en"> 3 <head> 4 <meta charset="UTF-8"> 5 <title>date02</title> 6 <style> 7 #date{ 8 position: absolute; 9 font-size: 30px; 10 font-family: '微软雅黑'; 11 top:50%; 12 left:50%; 13 -webkit-transform:translate(-50%,-50%); 14 } 15 </style> 16 </head> 17 <body> 18 <div id="date">2017.10.29</div> 19 <script> 20 window.onload = function(){ 21 var now = new Date();//获取当前时间 22 var timedate = new Date("2018,12,23");//截止时间 23 //getTime() 方法可返回距 1970 年 1 月 1 日之间的毫秒数。 24 var date = timedate.getTime() - now.getTime(); 25 //Math.ceil()向上取整 26 var time = Math.ceil(date/(24*60*60*1000)); 27 document.getElementById('date').innerHTML = time; 28 29 } 30 </script> 31 </body> 32 </html>
三.限时抢
1 <!DOCTYPE html> 2 <html lang="en"> 3 <head> 4 <meta charset="UTF-8"> 5 <title>date03</title> 6 <style> 7 #date{ 8 position: absolute; 9 font-size: 30px; 10 font-family: '微软雅黑'; 11 top:50%; 12 left:50%; 13 -webkit-transform:translate(-50%,-50%); 14 } 15 </style> 16 </head> 17 <body> 18 <div id="date">2017.10.29</div> 19 <script> 20 window.onload = function(){ 21 showTime(); 22 23 } 24 function checkTime(i){ 25 return i < 10? "0"+i:i; 26 } 27 function showTime(){ 28 var now = new Date();//获取当前时间 29 var timedate = new Date("2017/10/30,24:00:00");//截止时间 30 //getTime() 方法可返回距 1970 年 1 月 1 日之间的毫秒数。 31 var leftTime = (timedate.getTime() - now.getTime())/1000; 32 var d = checkTime(parseInt(leftTime/(24*60*60))); 33 var h = checkTime(parseInt(leftTime/(60*60)%24)); 34 var m = checkTime(parseInt(leftTime/60%60)); 35 var s = checkTime(parseInt(leftTime%60)); 36 var time = d + "天" + h + "小时" + m + "分钟" + s + "秒"; 37 document.getElementById('date').innerHTML = time; 38 setTimeout(showTime,500); 39 } 40 </script> 41 </body> 42 </html>