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Examples of common methods of Date objects in JavaScript_Basic knowledge

WBOY
WBOYOriginal
2016-05-16 15:35:241645browse

getFullYear()
Use getFullYear() to get the year.
Source code:

</script>
<!DOCTYPE html>
<html>
<body>
&#8203;
<p id="demo">Click the button to display the full year of todays date.</p>
&#8203;
<button onclick="myFunction()">Try it</button>
&#8203;
<script>
function myFunction()
{
var d = new Date();
var x = document.getElementById("demo");
x.innerHTML=d.getFullYear();
}
</script>
&#8203;
</body>
</html>

Test results:

2015


getTime()
getTime() returns the number of milliseconds since January 1, 1970.
Source code:

<!DOCTYPE html>
<html>
<body>
&#8203;
<p id="demo">Click the button to display the number of milliseconds since midnight, January 1, 1970.</p>
&#8203;
<button onclick="myFunction()">Try it</button>
&#8203;
<script>
function myFunction()
{
var d = new Date();
var x = document.getElementById("demo");
x.innerHTML=d.getTime();
}
</script>
&#8203;
</body>
</html>


Test results:

1445669203860

setFullYear()
How to use setFullYear() to set a specific date.
Source code:

<!DOCTYPE html>
<html>
<body>
&#8203;
<p id="demo">Click the button to display a date after changing the year, month, and day.</p>
&#8203;
<button onclick="myFunction()">Try it</button>
&#8203;
<script>
function myFunction()
{
var d = new Date();
d.setFullYear(2020,10,3);
var x = document.getElementById("demo");
x.innerHTML=d;
}
</script>
&#8203;
<p>Remember that JavaScript counts months from 0 to 11.
Month 10 is November.</p>
</body>
</html>

Test results:

Tue Nov 03 2020 14:47:46 GMT+0800 (中国标准时间)

toUTCString()
How to use toUTCString() to convert today's date (according to UTC) to a string.

Source code:

<!DOCTYPE html>
<html>
<body>
&#8203;
<p id="demo">Click the button to display the UTC date and time as a string.</p>
&#8203;
<button onclick="myFunction()">Try it</button>
&#8203;
<script>
function myFunction()
{
var d = new Date();
var x = document.getElementById("demo");
x.innerHTML=d.toUTCString();
}
</script>
&#8203;
</body>
</html>

Test results:

Sat, 24 Oct 2015 06:49:05 GMT

getDay()
How to use getDay() and an array to display the day of the week, not just the number.
Source code:

<!DOCTYPE html>
<html>
<body>
&#8203;
<p id="demo">Click the button to display todays day of the week.</p>
&#8203;
<button onclick="myFunction()">Try it</button>
&#8203;
<script>
function myFunction()
{
var d = new Date();
var weekday=new Array(7);
weekday[0]="Sunday";
weekday[1]="Monday";
weekday[2]="Tuesday";
weekday[3]="Wednesday";
weekday[4]="Thursday";
weekday[5]="Friday";
weekday[6]="Saturday";
&#8203;
var x = document.getElementById("demo");
x.innerHTML=weekday[d.getDay()];
}
</script>
&#8203;
</body>
</html>

Test results:

Saturday

Display a clock
How to display a clock on a web page.
Source code:

<!DOCTYPE html>
<html>
<head>
<script>
function startTime()
{
var today=new Date();
var h=today.getHours();
var m=today.getMinutes();
var s=today.getSeconds();
// add a zero in front of numbers<10
m=checkTime(m);
s=checkTime(s);
document.getElementById('txt').innerHTML=h+":"+m+":"+s;
t=setTimeout(function(){startTime()},500);
}
&#8203;
function checkTime(i)
{
if (i<10)
 {
 i="0" + i;
 }
return i;
}
</script>
</head>
&#8203;
<body onload="startTime()">
<div id="txt"></div>
</body>
</html>


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