为什么JS Date Difference Script中缺少大约30天 [英] Why is there an about 30 days missing in JS Date Difference Script

问题描述

我目前正在学习JavaScript和Jquery，我遇到了一个解决方案，可以相互减去2个日期。但结果是短短30天。怎么会？我做错了什么？另外，什么是最佳做法？

I am currently learning JavaScript and Jquery and I came across a solution to subtract 2 dates from each other. However, the result is short of 30 days. How come? What am I doing incorrectly? Also, what would be best practice?

<script>
    var d1 = new Date(); // todays date
    var d2 = new Date(2011,12,27);
    var msPerDay = 1000*60*60*24;
    document.write( ((d1 - d2) / msPerDay).toFixed(0) + " days");
</script>

提前致谢

推荐答案

Javascript月份从零开始。

Javascript months are zero-based.

12月 11 。

12 将环绕并成为明年的1月。

December is 11.
12 will wrap around and become January of the next year.

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