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Detailed explanation of JavaScript's Date object (making a simple clock)_javascript skills

WBOY
WBOYOriginal
2016-05-16 15:27:511656browse

JS provides the Date type to handle time and date. The Date type has a series of built-in methods for obtaining and setting date and time information. Below we simply
Give an overview of this Date type.
I took a look at the method of Date, and gave it below:

You can try the above method yourself. I will simply demonstrate the correct output format of JS: 

var today=new Date();//创建一个时间日期对象 
document.write("<h4>下面的是世界标准的时间输出：</h4>"); 
document.write(today+"<hr/>"); 
document.write("<h4>下面的是符合我们本地的时间输出：</h4>"); 
document.write(today.toLocaleString()+"<hr/>"); 
document.write("<h4>下面的是符合我们中国人的时间输出：</h4>"); 
document.write(today.getFullYear()+"-"+(today.getMonth()+1)+"-"+today.getDate()+" "+today.getHours()+":"+today.getMinutes()+":"+today.getSeconds()+"<hr/>");

The output result is:

When I saw this, I thought of the local clock that comes with the computer. Click the time on the taskbar, and a clock will pop up:

So now that we know the Date type in JS, can we display a local time and date clock on the web page? Because of the JS knowledge we have learned
With little knowledge, I simply made a simple clock.
                                                                                                                                                                                          Give code: 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> 
<title>综合实例之制作简易钟表</title> 
<style type="text/css"> 
* { 
  margin:0px; 
  padding:0px; 
  outline:none; 
} 
body { 
    background-color:#0E0E0E; 
  overflow:hidden; 
} 
.date { 
  width:860px; 
  height:250px; 
  border:1px solid #FFFFFF; 
  margin:auto; 
  margin-top:200px; 
  color:#FFFFFF; 
} 
#time1 { 
     width:860px; 
   height:100px; 
   margin:auto; 
   font-size:75px; 
   text-align:center; 
} 
#time2 { 
     font-size:125px; 
   text-align:center; 
} 
</style> 
<script type="text/javascript"> 
   function startTime()//显示日期的函数 
  { 
    var today=new Date();//创建日期时间对象 
    var n=today.getFullYear();//获取当前时间的年份 
    var m=today.getMonth();//获取当前时间的月份 
    var d=today.getDate();//获取当前时间的日期 
      var h=today.getHours();//获取当前时间的小时 
    var f=today.getMinutes();//获取当前时间的分钟 
    var s=today.getSeconds();//获取当前时间的秒钟 
    var weekday=new Array(7);//创建星期数组 
    weekday[0]="星期日"; 
    weekday[1]="星期一"; 
    weekday[2]="星期二"; 
    weekday[3]="星期三"; 
    weekday[4]="星期四"; 
    weekday[5]="星期五"; 
    weekday[6]="星期六"; 
    document.getElementById('time1').innerHTML=weekday[d+1]+" "+n+"-"+(m+1)+"-"+checkTime(d); 
      f=checkTime(f); 
      s=checkTime(s); 
      document.getElementById('time2').innerHTML=h+":"+f+":"+s; 
      t=setTimeout('startTime()',500); 
  } 
  function checkTime(i)//日期校验函数 
  { 
    if (i<10)  
   { 
     return i="0" + i; 
    } 
    else  
    { 
     return i; 
    } 
  } 
</script> 
</head> 
 
<!--body标签调用JS中的startTime()方法即打开网页就显示出当前年月日和时间--> 
<body onload="startTime()"> 
 
<!--封装整个显示日期区域--> 
<div class="date"> 
   <!--显示当前年月日--> 
   <div id="time1"></div> 
  <!--显示当前北京时间--> 
   <div id="time2"></div> 
</div> 
 
</body> 
</html>

Look at the results of the operation:


By making a simple clock effect, learning the Date object of JavaScript, and deepening the understanding of the Date object, I hope it will be helpful to everyone's learning.

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