Javascript Date.UTC（）函数关闭一个月？ [英] Javascript Date.UTC() function is off by a month?

问题描述

  var a = new，我在玩JavaScript，创建一个简单的倒计时时钟Date（），
 now = a.getTime（），
 then = Date.UTC（2009,10,31），
 diff = then  -  now，
 daysleft = parseInt （diff /（24 * 60 * 60 * 1000））; 
 console.log（daysleft）; 
  

剩下的时间是30天前关闭。

此代码有什么问题？

编辑：我更改了变量名，使之更加清晰。

解决方案

这个月是基于零的JavaScript。

年份为一个。

Go figure。

更新 p>

原因是这样的，从 JavaScript的创建者，是

JS不得不像Java那样看起来像Java的笨蛋兄弟或男孩人质的sidekick。此外，我必须在十天内完成，或者比JS更糟糕的事情。

http://www.jwz.org/ blog / 2010/10 / every-day-i-learn-something-new-and-stupid /＃comment-1021

I was playing around with Javascript creating a simple countdown clock when I came across this strange behavior:

var a = new Date(), 
now = a.getTime(),
then = Date.UTC(2009,10,31),
diff = then - now,
daysleft = parseInt(diff/(24*60*60*1000));
console.log(daysleft );

The days left is off by 30 days.

What is wrong with this code?

Edit: I changed the variable names to make it more clear.

解决方案

The month is zero-based for JavaScript.

Days and years are one-based.

Go figure.

UPDATE

The reason this is so, from the creator of JavaScript, is

JS had to "look like Java" only less so, be Java's dumb kid brother or boy-hostage sidekick. Plus, I had to be done in ten days or something worse than JS would have happened.

http://www.jwz.org/blog/2010/10/every-day-i-learn-something-new-and-stupid/#comment-1021

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