JavaScript中Date对象的常用方法示例
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2022-04-18 19:00:58
getfullyear()
使用 getfullyear() 获取年份。
源代码:
getfullyear()
使用 getfullyear() 获取年份。
源代码:
</script> <!doctype html> <html> <body> <p id="demo">click the button to display the full year of todays date.</p> <button onclick="myfunction()">try it</button> <script> function myfunction() { var d = new date(); var x = document.getelementbyid("demo"); x.innerhtml=d.getfullyear(); } </script> </body> </html>
测试结果:
2015
gettime()
gettime() 返回从 1970 年 1 月 1 日至今的毫秒数。
源代码:
<!doctype html> <html> <body> <p id="demo">click the button to display the number of milliseconds since midnight, january 1, 1970.</p> <button onclick="myfunction()">try it</button> <script> function myfunction() { var d = new date(); var x = document.getelementbyid("demo"); x.innerhtml=d.gettime(); } </script> </body> </html>
测试结果:
1445669203860
setfullyear()
如何使用 setfullyear() 设置具体的日期。
源代码:
<!doctype html> <html> <body> <p id="demo">click the button to display a date after changing the year, month, and day.</p> <button onclick="myfunction()">try it</button> <script> function myfunction() { var d = new date(); d.setfullyear(2020,10,3); var x = document.getelementbyid("demo"); x.innerhtml=d; } </script> <p>remember that javascript counts months from 0 to 11. month 10 is november.</p> </body> </html>
测试结果:
tue nov 03 2020 14:47:46 gmt+0800 (中国标准时间)
toutcstring()
如何使用 toutcstring() 将当日的日期(根据 utc)转换为字符串。
源代码:
<!doctype html> <html> <body> <p id="demo">click the button to display the utc date and time as a string.</p> <button onclick="myfunction()">try it</button> <script> function myfunction() { var d = new date(); var x = document.getelementbyid("demo"); x.innerhtml=d.toutcstring(); } </script> </body> </html>
测试结果:
sat, 24 oct 2015 06:49:05 gmt
getday()
如何使用 getday() 和数组来显示星期,而不仅仅是数字。
源代码:
<!doctype html> <html> <body> <p id="demo">click the button to display todays day of the week.</p> <button onclick="myfunction()">try it</button> <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"; var x = document.getelementbyid("demo"); x.innerhtml=weekday[d.getday()]; } </script> </body> </html>
测试结果:
saturday
display a clock
如何在网页上显示一个钟表。
源代码:
<!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); } function checktime(i) { if (i<10) { i="0" + i; } return i; } </script> </head> <body onload="starttime()"> <div id="txt"></div> </body> </html>
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