How to display time dynamically by javascript

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Javascript display time method: 1, use "new Date ()" to define the date object; 2, use the date object's getFullYear (), getMonth () and other methods to obtain the year, month, day, hour and second value and output; 3, use the setTimeout () method to refresh the time value once a second.

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

Javascript dynamic display time implementation code:

Dynamically display system date time function startTime () {var today=new Date (); / / define date object var yyyy = today.getFullYear (); / / return year var MM = today.getMonth () + 1 through the date object's getFullYear () method / / return the year var dd = today.getDate () through the date object's getMonth () method; / / return the year var hh=today.getHours () through the date object's getDate () method; / / return the hour var mm=today.getMinutes () through the date object's getHours method / / return minutes var ss=today.getSeconds () through the date object's getMinutes method; / / return seconds through the date object's getSeconds method / / if the value of the minute or hour is less than 10, add 0 to its value, for example, if the time is 03:20:09 in the afternoon, it shows 15:20:09 MM=checkTime (MM) Dd=checkTime (dd); mm=checkTime (mm); ss=checkTime (ss); var day / used to save the week (getDay () method gets the week number) if (today.getDay () = = 0) day = "Sunday" if (today.getDay () = = 1) day = "Monday" if (today.getDay () = = 2) day = "Tuesday" if (today.getDay ( ) = 3) day = "Wednesday" if (today.getDay () = = 4) day = "Thursday" if (today.getDay () = = 5) day = "Friday" if (today.getDay () = = 6) day = "Saturday" document.getElementById ('nowDateTimeSpan') [xss_clean] = yyyy+ "-" + MM + "-" + dd + "" + hh+ ":" + mm+ ":" + ss+ "" + day SetTimeout ('startTime ()', 1000); / / reload the startTime () method} function checkTime (I) {if (I) every second