我需要知道有多少天，但我不确定数学。这是我到目前为止所做的：
var birthYear = parseInt(prompt ('Enter your birth year:'));
var birthMonth = prompt ('Enter the name of the month of birth:');
var birthDay = parseInt(prompt ('Enter your day of birth as an integer:'));
var milliDay = 1000*60*60*24; //Milliseconds in a day
monthAbb = 'janfebmaraprmayjunjulaugsepoctnovdec';
chineseZod = 12;
zodCycle = 1924; //Chinese Zodiac Cycle
var zodAnimal = new Array('Rat','Ox','Tiger','Rabbit','Dragon','Snake','Horse','Goat','Monkey','Rooster','Dog','Pig');
var zodAnimalD = new Array('Forthright, tenacious, intense, meticulous, charismatic, sensitive, intellectual, industrious, charming, eloquent, sociable, artistic, and shrewd. Can be manipulative, vindictive, self-destructive, envious, mendacious, venal, obstinate, critical, over-ambitious, ruthless, intolerant, and scheming.','Dependable, ambitious, calm, methodical, born leader, patient, hardworking, conventional, steady, modest, logical, resolute, and tenacious. Can be stubborn, dogmatic, hot-tempered, narrow-minded, materialistic, rigid, and demanding.','Unpredictable, rebellious, colorful, powerful, passionate, daring, impulsive, vigorous, stimulating, sincere, affectionate, humanitarian, and generous. Can be restless, reckless, impatient, quick-tempered, obstinate, selfish, aggressive, and moody.','Gracious, good friend, kind, sensitive, soft-spoken, amiable, elegant, reserved, cautious, artistic, thorough, tender, self-assured, shy, astute, compassionate, lucky, and flexible. Can be moody, detached, superficial, self-indulgent, opportunistic, and stubborn.','Magnanimous, stately, vigorous, strong, self-assured, proud, noble, direct, dignified, eccentric, intellectual, fiery, passionate, decisive, pioneering, artistic, generous, and loyal. Can be tactless, arrogant, imperious, tyrannical, demanding, intolerant, dogmatic, violent, impetuous, and brash.','Deep thinker, wise, mystic, graceful, soft-spoken, sensual, creative, prudent, shrewd, elegant, cautious, responsible, calm, strong, constant, and purposeful. Can be a loner, bad communicator, possessive, hedonistic, self-doubting, distrustful, mendacious, suffocating, and cold.','Cheerful, popular, quick-witted, changeable, earthy, perceptive, talkative, agile, magnetic, intelligent, astute, flexible, and open-minded. Can be fickle, arrogant, childish, anxious, rude, gullible, and stubborn.','Righteous, sincere, sympathetic, mild-mannered, observant, artistic, intellectual, ingenious, innovative, creative, mothering, peaceful, and generous. Can be indecisive, over-passive, worrier, pessimistic, sensitive, shy, and weak-willed.','Inventor, motivator, improviser, quick-witted, inquisitive, flexible, innovative, problem solver, self-assured, sociable, artistic, polite, dignified, competitive, objective, and factual. Can be egotistical, vain, arrogant, selfish, reckless, snobbish, deceptive, manipulative, cunning, jealous, suspicious, and stubborn.',' Acute, neat, meticulous, organized, self-assured, decisive, conservative, critical, perfectionist, alert, zealous, practical, scientific, and responsible. Can be over zealous and critical, puritanical, egotistical, abrasive, proud, opinionated, and gives into empty bravado.','Honest, intelligent, straightforward, loyal, sense of justice and fair play, attractive, amicable, unpretentious, sociable, open-minded, idealistic, moralistic, practical, affectionate, sensitive, and easy going. Can be cynical, lazy, cold, judgmental, pessimistic, worrier, stubborn, and quarrelsome.','Honest, gallant, sturdy, sociable, peace-loving, patient, loyal, hard-working, trusting, sincere, calm, understanding, thoughtful, scrupulous, passionate, and intelligent. Can be naive, over-reliant, self-indulgent, gullible, fatalistic, and materialistic.');
var monthArr = new Array(11);
monthArr [0] = "jan";
monthArr [1] = "feb";
monthArr [2] = "mar";
monthArr [3] = "apr";
monthArr [4] = "may";
monthArr [5] = "jun";
monthArr [6] = "jul";
monthArr [7] = "aug";
monthArr [8] = "sep";
monthArr [9] = "oct";
monthArr [10] = "nov";
monthArr [11] = "dec";
var monthNum = monthAbb.indexOf(birthMonth.slice(0, 3).toLowerCase()) / 3;
alert(monthNum);
var d = new Date (birthYear, monthNum, birthDay);
alert(d);
var dCurrent = new Date();
dCurrent = dCurrent.getTime(); //Grabs the time of the current date in milliseconds.
var dTotal = dCurrent - d;
alert(dTotal);
dTotal = dTotal / milliDay;
dTotal = Math.floor(dTotal); //7193
alert(dTotal + ' is after division');
dTotal = dTotal / 365.25;
dTotal = Math.floor(dTotal);
alert(dTotal + ' is how old you are!');
dTotal = birthYear - zodCycle;
dTotal = dTotal % chineseZod;
alert(dTotal);
alert(d);
var testS;
testS = dCurrent - d;
testS = testS / milliDay;
testS = testS * 365.25;
document.write("<span style=\"color: red;\">" + 'Your birthday is ' + d.toDateString() + "</span>");
alert(testS);
答案 0 :(得分：2)
这实际上要比这容易得多。一旦你有两个日期（他们的生日和“现在”），你只需这样做：
var days = Math.floor((now - birthDate) / 86400000);
这是因为在JavaScript中，Date objects保持自The Epoch以来的毫秒时间以及对它们进行数学运算时，它们使用该毫秒值（结果是毫秒数）。并且JavaScript假设每天正好86,400,000毫秒。
一旦你有birthYear，monthNum和birthDay：
var birthDate = new Date(birthYear, monthNum, birthDay);
var days = Math.floor((new Date() - birthdate) / 86400000);
答案 1 :(得分：0)
我不确定如何在JavaScript中实现这一点，但为什么不根据用户的出生日期生成时间戳，从当前时间戳中减去它，然后（假设时间戳以秒为单位） ）除以一天中的秒数？