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First, Date Object
Creation of 1.Date objects
new Date () New Date (month dd,yyyy hh:mm:ss) new Date (YYYY,MTH,DD,HH,MM,SS) new Date (YYYY,MTH,DD) new Date (ms) <script type= "Text/javascript" > var d1=New Date (); The first method created is document.write (d1.tostring () + "<br>"); // second method of Creation var d2=New Date ("2009-02-28 18:18:18"); document.write (D2.todatestring ()); </script>Acquisition of 2.Date objects
GetDate () |
returns a day in one months from a Date object (1~31) |
GetDay () |
returns a day of the week from a Date object (0~6) |
GetMonth () |
Returns the month from the Date object (0~11) |
getFullYear () |
returns the year as a four-digit number from a Date Object |
GetHours () |
Returns the hour of the Date object (0~23) |
Getminutes () |
Returns the minute of the Date object (0~59) |
Getseconds () |
Returns the number of seconds of the Date object (0~59) |
GetTime () |
Returns the number of milliseconds in 1970 year 1 months 1 days to present |
var year=d1.getfullyear (); var month=d1.getmonth () +1; var date=d1.getdate (); var day=d1.getday (); document.write (year + "Years" +month+ "month" +date+ "Day" +day);
Settings for 3.Date objects
SetDate () |
Set a day of the month in a Date object (1~31) |
Setmonth |
Set the month in the Date object (0~11) |
setFullYear () |
Set the year in the Date object (four digits) |
Sethours () |
Set the hour in the Date object (0~23) |
Setminutes () |
Set the minutes in a Date object (0~59) |
Setseconds () |
Sets the second of the Date object (0~59) |
Setmilliseconds () |
Sets the milliseconds in the Date object (0~999) |
<script type= "Text/javascript" >//set Date is 2018.1.18 daysD1.setfullyear (2018); D1.setmonth (0); D1.setdate (18);//get date of January 18, 2018 varYear=d1.getfullyear (); varMonth=d1.getmonth (+1); varDate=d1.getdate (); varday=D1.getday ();//Judging January 18, 2018 is the day of the week Switch(day) { Case0: Day= "Sunday"; Break; Case1: Day= "Monday"; Break; Case2: Day= "Tuesday"; Break; Case3: Day= "Wednesday"; Break; Case4: Day= "Thursday"; Break; Case5: Day= "Friday"; Break; Case6: Day= "Saturday"; Break; default: Day= "Error Data" }//Date of Output January 18, 2018document.write (year+ "year" +month+ "month" +date+ "Day" +Day ); </script>
Second, the Math object
1. Common methods
ABS (x) |
The absolute value of the return number |
Ceil (x) |
Rounding on a logarithmic |
Floor (x) |
Rounding with logarithms |
Max (x, y) |
Returns the highest value in x and y |
Min (x, y) |
Returns the lowest value in x and y |
Pow (x, y) |
Returns the y power of X |
Random () |
Returns the number of random numbers between 0~1 |
Round (x) |
Rounding a number to the nearest integer |
sqrt (x) |
The square root of the returned number |
Sin (x) returns the sinusoidal value of a number
<!doctype html>varA=math.abs (-1); document.write (A+ "<br>"); varB=math.ceil (11.2);//Rounding ondocument.write (b + "<br>"); varC=math.floor (11.2);//Rounding Downdocument.write (c+ "<br>"); varD=math.max (50,12);//To find the maximum valuedocument.write (d+ "<br>"); varE=math.min (50,12);//To find the minimum valuedocument.write (e+ "<br>"); varF=math.pow (2,3);//3 powers of 2document.write (f+ "<br>"); varG=math.random ();//random number between 0-1document.write (g+ "<br>"); varH=math.round (3.7);//Roundingdocument.write (H + "<br>"); varI=MATH.SQRT (6);//Find square rootdocument.write (i+ "<br>"); //π to find the area of a circle: varCircle=math.pow (2,2) *Math.PI; document.write (circle); </script>JS Basics 8-Common built-in objects (date and math)
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