Based on the month and date of the birthday, a line of code calculates the JS small function of the constellation

See the other people write a calculation of the constellation JS, a long bit of a look not to the past, I wrote a.
I think this function should be concise enough:)
What if AH switch ah for ah all go away ...
Incoming parameters: month [int] 1~12; day [int] 1~31.

// the constellation is calculated based on the month and date of the birthday. http://blog.csdn.net/cuixiping/

functionGetastro (month,day) {
vars="Capricorn Aquarius Pisces Aries taurus Gemini cancer lion Virgin Libra Scorpio shooter Capricorn";
vararr=[ -, +, +, +, +, A, at, at, at, at, A, A];
returnS.substr (Month*2-( Day<Arr[month-1]?2:0),2);
}

If you search the online "date constellation function", in addition to my or reprint my code, almost is a long code, I am afraid I can not find more concise code than the above.

However, the above 3 lines of code can still be further streamlined, and then to improve:

//  the constellation is calculated based on the month and date of the birthday. http://blog.csdn.net/cuixiping/
function getastro (m,d) {

return "capricorn Aquarius Pisces aries taurus Gemini giant crab lion Virgin libra Scorpio shooter Capricorn". substr (m*2-(d<"102223444433". CharAt ( M-1)--19) *2,2);
}

is not cool, only one line of code, and the maximum simplification.

The above uses a substr function and a charAt function, if you do not consider IE, then. charAt (m-1) can even be reduced to [m-1]

If you do not need to output the constellation name and only need the constellation number index, the preceding string can also be omitted, it looks like this:

//  the constellation is calculated based on the month and date of the birthday. http://blog.csdn.net/cuixiping/
function getastro (m,d) {

return    m (d<"102223444433". CharAt (m-1)--19); //Output 0~12 number, 0 for Capricorn, 1 for water bottle, and so on, ..., 11 is shooter, 12 is Capricorn.
}

Write a test code below to verify:

//  the constellation is calculated based on the month and date of the birthday. http://blog.csdn.net/cuixiping/
function getastro (m,d) {

return "capricorn Aquarius Pisces aries taurus Gemini giant crab lion Virgin libra Scorpio shooter Capricorn". substr (m*2-(d<"102223444433". CharAt ( M-1)--19) *2,2);
}

Write a test function below

function Test (m,d) {
document. Writeln (m+"month"+d+"Day"+getastro (m,d));
}

Test

Test (12,21); //output: December 21 shooter
Test (12,22); //output: December 22 capricorn
Test (+); //output: January 1 capricorn
Test (2,18); //output: February 18 water bottle
Test (2,19); //output: February 19 pisces

With 12 constellation Date control:

Capricorn (12/22-1/19), Aquarius (1/20-2/18), Pisces (2/19-3/20), Aries (3/21-4/20),
Taurus (4/21-5/20), Gemini (5/21-6/21), Cancer (6/22-7/22), Leo (7/23-8/22),
Virgo (8/23-9/22), Libra (9/23-10/22), Scorpio (10/23-11/21), Sagittarius (11/22-12/21)

According to the month and date of the birthday, a line of code to calculate the constellation JS small function (GO)