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In javascript, you can use the Date () method in the Date object to get the current time, which returns the date and time of the day, or you can use "new Date ()" to create a time object that uses the built-in time reading method to get information such as year, month, day, hour, minute, second, and so on.

The operating environment of this tutorial: windows7 system, javascript1.8.5 version, Dell G3 computer.

In javascript, you can use the Date () method in the Date object to get the current time. The Date () method returns the date and time of the day.

Date ()

Example: output today's date and time

Console.log (Date ())

Output:

Or you can use different methods in the Date object to format the time and display it in a fixed format.

First, use new Date () to create a present time object, and then use get as the prefix time reading method to obtain the present tense information such as year, month, day, hour, minute, second and so on. Finally, the timer is set to execute once per second to achieve real-time update.

[procedure]

1) Design the time display function, in which the Date object is created to obtain the current time, and then the year, month, day, hour, minute, second and other information are obtained respectively, and finally assembled into a time string and returned.

Var showtime = function () {var nowdate = new Date () Var year = nowdate.getFullYear (), month = nowdate.getMonth () + 1, date = nowdate.getDate (), day = nowdate.getDay (), week = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"], h = nowdate.getHours (), m = nowdate.getMinutes () S = nowdate.getSeconds (), h = checkTime (h), m = checkTime (m), s = checkTime (s) Return year + year + month + month + date + Day + week [day] + "+ h +": "+ m +": "+ s;}

2) because the usual time format is 00:00:01, and the getHours (), getMinutes (), getSeconds () methods get a format of 0 to 9 instead of 00 to 09. So in the process from 9 to 10, from one digit to two digits, again from 59 seconds to zero seconds, or 59 minutes to zero minutes, or 23:00 to zero. For example: 23:59:59 the next second should be 00:00:00, actually 0:0:0, so that the format is not uniform, but also a sudden increase in visual number, or sudden decrease, resulting in a sense of shaking.

An auxiliary function is defined below to change the time of one digit to two digits.

Var checkTime = function (I) {if (I < 10) {I = "0" + I;} return I;}

3) add a tag to the page and set the value of id.

4) bind the timer for the label and set the time display function once per second clock in the timer.

Var div = document.getElementById ("showtime"); setInterval (function () {div [XSS _ clean] = showtime ();}, 1000); / / execute the function repeatedly

The display results are as follows:

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