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JS simple implementation method to calculate zodiac sign based on birthday month and date

高洛峰
Release: 2016-12-05 13:31:02
Original
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The example in this article describes the simple implementation method of calculating the zodiac sign based on the birthday month and date using JS. I would like to share it with you for your reference. The details are as follows:

I saw a js for calculating zodiac signs written by someone else. It was too long to read, so I wrote it myself.

I think this function should be concise enough :)

Pass in parameters: month [int] 1~12; day [int] 1~31.

// 根据生日的月份和日期,计算星座。
function getAstro(month,day){
  var s="魔羯水瓶双鱼牡羊金牛双子巨蟹狮子处女天秤天蝎射手魔羯";
  var arr=[20,19,21,21,21,22,23,23,23,23,22,22];
  return s.substr(month*2-(day<arr[month-1]?2:0),2);
}
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If you search for "date constellation function" on the Internet, except for mine or reprinted my code, almost all of them are long codes. I am afraid that you cannot find any more concise code than the above.

However, the above 3 lines of code can still be further streamlined. Let’s improve it again:

// 根据生日的月份和日期,计算星座。
function getAstro(m,d){
  return "魔羯水瓶双鱼牡羊金牛双子巨蟹狮子处女天秤天蝎射手魔羯".substr(m*2-(d<"102223444433".charAt(m-1)- -19)*2,2);
}
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Isn’t it cool? There is only one line of code, and it is streamlined to the maximum extent.

A substr function and a charAt function are used above. If IE is not considered, then .charAt(m-1) can even be simplified to [m-1]

If you do not need to output the constellation name but only need the constellation numerical index, The previous string can also be omitted, it looks like this:

// 根据生日的月份和日期,计算星座。
function getAstro(m,d){
  return m-(d<"102223444433".charAt(m-1)- -19);  //输出0~12的数字,0表示摩羯,1表示水瓶,依此类推,...,11是射手,12是摩羯。
}
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Write a test code below to verify:

// 根据生日的月份和日期,计算星座。
function getAstro(m,d){
  return "魔羯水瓶双鱼牡羊金牛双子巨蟹狮子处女天秤天蝎射手魔羯".substr(m*2-(d<"102223444433".charAt(m-1)- -19)*2,2);
}
//下面写一个测试函数
function test(m,d){
document.writeln(m+"月"+d+"日 "+getAstro(m,d));
}
//测试
test(12,21); //输出: 12月21日 射手
test(12,22); //输出: 12月22日 魔羯
test(1,1);   //输出: 1月1日 魔羯
test(2,18);  //输出: 2月18日 水瓶
test(2,19);  //输出: 2月19日 双鱼
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Attached is the date comparison of the twelve zodiac signs:

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)


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