奇日期行爲

Question

使用下面的代碼，直到這個星期，對象是返回一個下拉式的「正確」的周，即36周爲37年9月5日爲9月12日，等

由於這個月已經變成了十月，現在這些星期正在被錯誤地返回。從LEAP.Schedule對象

代碼：

/* --- LEAP Namespace --- */ 
    var LEAP = {}; 

/* --- LEAP.Schedule Object --- */ 
    LEAP.Schedule = function(){//init 
     this.weeks = []; 
     this.calculateWeeks(); 
    }; 

    LEAP.Schedule.prototype.calculateWeeks = function(){ 
     this.date = new Date (2011, 8, 5); // First week of new school year 
     this.num = 36; // Calendar number of this week 
     this.weeks.push(new LEAP.Schedule.week(this.date, this.num)); 

     for (var i = 1; i < 51; i++) { 
      var week = i * 7; 
      var updated_date = new Date(); 
      updated_date.setDate(this.date.getDate() + week); 

      if (this.num > 51) { 
       this.num = 0; 
      } 
      this.num++; 

      this.weeks.push(new LEAP.Schedule.week(updated_date, this.num)); 
     } 
    }; 

    LEAP.Schedule.prototype.getWeeks = function(){ 
     return this.weeks; 
    }; 


/* --- LEAP.Schedule.week Object --- */ 
    LEAP.Schedule.week = function(n_date, n_week){ 
     this.week = n_week; 
     this.date = n_date; 

     this.year = this.date.getFullYear(); 
     this.month = this.date.getMonth(); 
     this.month += 1; 
     this.day = this.date.getDate(); 

     var mydate = new Date(this.date); 
     this.end_date = mydate.setDate(mydate.getDate() + 6); 
    }; 

    LEAP.Schedule.week.prototype.getJSDate = function(){ 
     return this.date; 
    }; 

    LEAP.Schedule.week.prototype.getStartDate = function(){ 
     return this.year + "-" + pad(this.month) + "-" + pad(this.day); 
    }; 

    LEAP.Schedule.week.prototype.getEndDate = function(){ 
     end_of_week = new Date(this.end_date); 

     var year = end_of_week.getFullYear(); 
     var month = pad(end_of_week.getMonth() + 1); 
     var day = pad(end_of_week.getDate()); 

     return year + "-" + month + "-" + day; 
    }; 

    LEAP.Schedule.week.prototype.getLabel = function(){ 
     return "Week " + this.week + ": " + this.day + (this.day==1||this.day==21||this.day==31?"st":this.day==2||this.day==22?"nd":this.day==3||this.day==23?"rd":"th") + " " + ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"][this.month-1] + " " + this.year; 
    }; 

pad = function (n) { 
    return n>9 ? n : "0"+n; 
}; 

代碼初始化/顯示該對象：

WeeklyUpdate.init = function() { 
    var Scheduleobject = new LEAP.Schedule(); 
    var weeks = Scheduleobject.getWeeks(); 

    var dispHTML = '<p>weeks.length: ' + weeks.length + '</p>'; 

    for (var i = 0; i < weeks.length; i++) { 
     if (i % 2 > 0) { 
      dispHTML += '<div style="background:#ccc;">'; 
     } else { 
      dispHTML += '<div style="background:#fff;">'; 
     } 
     dispHTML += '<p>i: ' + i + '</p>'; 
     dispHTML += '<p>getJSDate: ' + weeks[i].getJSDate() + '</p>'; 
     dispHTML += '<p>getStartDate: ' + weeks[i].getStartDate() + '</p>'; 
     dispHTML += '<p>getEndDate: ' + weeks[i].getEndDate() + '</p>'; 
     dispHTML += '<p>getLabel: ' + weeks[i].getLabel() + '</p>'; 
     dispHTML += '</div>'; 
    } 

    $('div#wrapper').html(dispHTML); 

    //WeeklyUpdate.displayWeekFilter(weeks); 
} 

輸出（三週後修整）：

weeks.length: 51 

i: 0 

getJSDate: Mon Sep 05 2011 00:00:00 GMT+0100 (GMT Daylight Time) 

getStartDate: 2011-09-05 

getEndDate: 2011-09-11 

getLabel: Week 36: 5th Sep 2011 

i: 1 

getJSDate: Wed Oct 12 2011 13:58:02 GMT+0100 (GMT Daylight Time) 

getStartDate: 2011-10-12 

getEndDate: 2011-10-18 

getLabel: Week 37: 12th Oct 2011 

i: 2 

getJSDate: Wed Oct 19 2011 13:58:02 GMT+0100 (GMT Daylight Time) 

getStartDate: 2011-10-19 

getEndDate: 2011-10-25 

getLabel: Week 38: 19th Oct 2011 

我已經看了這幾次，但我越來越困惑！有任何想法嗎？我相信這是非常明顯的。

乾杯

Answer 1

使用該代碼，並改變基準日到this.week變量。

我也對代碼的一部分應用了一個更改，它決定了一個新的一週。否則，你會回到接近這個歷年年底，問爲什麼你的代碼被打破;）

LEAP.Schedule.prototype.calculateWeeks = function(){ 
    this.date = new Date (2011, 8, 5); // First week of new school year 
    this.num = 36; // Calendar number of this week 
    this.weeks.push(new LEAP.Schedule.week(this.date, this.num)); 

    var not_new = true; 
    for (var i = 1; i < 51; i++) { 
     var week = i * 7; 
     var updated_date = new Date(this.date); 
     updated_date.setDate(this.date.getDate() + week); 

     if (not_new && updated_date.getYear() > this.date.getYear()) { 
      not_new = this.num = 0; 
     } 
     this.num++; 

     this.weeks.push(new LEAP.Schedule.week(updated_date, this.num)); 
    } 
}; 

Answer 2

當你初始化new Date()則默認爲當前日期。 getDate僅指日期，而不是月份或年份。你的代碼在九月份工作，因爲它與開始的月份一樣，但現在是十月份，所以你從錯誤的月份抵消了。

var updated_date = new Date(); 

應該

var updated_date = new Date (2011, 8, 5); 

您是從本學年開始，就沒有今天抵消的方式。

演示：http://jsfiddle.net/aXgk6/