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Native javascript implements automatic update of time and date, and javascript automatically updates
Things that can be dynamically changed are always more attractive and even more practical than static ones, such as the time and date effects that can be automatically changed, the following code example describes how to achieve this effect. The code example is as follows:
I. Specific Code
<Html>The above code implements our requirements. The following describes the implementation process.
II. Implementation Principle
Time () functionYou can obtain the current time and date, and then use the timer function to call the time () function recursively at the end of the function, that is, you can continuously execute the time () function, as a result, the process of automatic update of time and date is realized, which will not be described here.Iii. supplement relevant information
Javascript Time Functions
Javascript provides the Date object for time and Date calculation. The Date object has multiple constructors:
1. dateObj = new Date () // current time
2. dateObj = new Date (milliseconds) // The number of milliseconds from January 1, January 1, 1970.
3. dateObj = new Date (datestring) // string indicates the Date and time. This string can be converted using Date. parse (), for example, "Jannuary 1, 1998 20:13:15"
4. dateObj = new Date (year, month, day, hours, minutes, seconds, microseconds) // time value. You do not need to write it all. If you do not write it all, the default value is 0.
Used to call object functions, such
Year = dateObj. getFullYear (); // obtain the year value.Below isDate object function listThe usage is as follows:
1) Obtain class functions:
GetDate () function -- returns the number of days (1-31)
GetDay () function -- returns the number of weeks (0-6)
GetFullYear () function -- returns the four-digit year.
GetHours () function -- Return hours (0-23)
GetMilliseconds () function -- returns the number of milliseconds (0-999)
GetMinutes () function -- returns the number of minutes (0-59)
GetMonth () function -- returns the number of months (0-11)
GetSeconds () function -- number of seconds returned (0-59)
GetTime () function -- returns the timestamp representation (expressed in milliseconds)
GetYear () function -- returns the year (real year minus 1900)2) Set class functions:
(The following functions return the number of milliseconds between the date object and midnight on January 1, January 1, 1970)
SetDate () function -- set the day of the month
SetFullYear () function -- set the year, month, and day
SetHours () function-set hours, minutes, seconds, and milliseconds
SetMilliseconds () function -- set the number of milliseconds
SetMinutes () function-set minute, second, millisecond
SetMonth () function -- set month, day
SetSeconds () function -- set the day of the month
SetTime () function -- set the date object in milliseconds
SetYear () function -- set the year (real year minus 1900)3) convert the display class function:
ToLocalString () function -- returns the localized string representation.
ToLocaleDateString function -- returns the localized string of the date part.
ToLocaleTimeString function -- returns the localized string of the time part.Compared with local output, there are:
ToString ()
ToDateString ()
ToTimeString ()The difference is that the former has different local language formats based on different machines, and the latter is an internal representation format.
4) date parsing functions
Date. parse () function-parses a Date string and returns the number of milliseconds between the Date and midnight on January 1, January 1, 1970.
The above is a detailed description of the javascript time and date, and I hope to help you learn it.
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