創建從用戶輸入一個日期對象

Question

力圖打造從用戶的Date對象輸入出生日期，然後getDay自今日起他們進入：

MONTHS = 'JANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC'; //months 

var dateString = prompt('Enter your birth date in the form dd mmm yyyy','26 APR 1988'); //get users date of birth 
var substrings = dateString.split(' '); 
var day = substrings[0]; 
var month = substrings[1]; 
var year = substrings[2]; 

var pos = MONTHS.indexOf(MONTHS); 
if (pos >= 0) { 
} 

alert(MONTHS.indexOf(month)/3); 

var daysOfWeek = ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"]; 
var daysOfWeek = new Date('day','month','year'); 
document.writeln(daysOfWeek.getDay());{ 

我不知道要放什麼東西在新日期對象，我試了幾件事，我完全偏離軌道？

Answer 1

構造函數Date的語法有些不同。嘗試以下方法：

var MONTHS = ["JAN", "FEB", ..., "DEC"]; 
var monthNum = MONTHS.indexOf(month); 
var birthDate = new Date(year, monthNum, day); 

注意monthNum是零指數（即0 =一月，1 =二月，...，11 =分解）。