小编Zec*_*ecc的帖子

为什么下面的代码真正起作用？

码

var firstDate = new Date();

// some time passing here

var secondDate = new Date();

// Difference seems to contain difference in miliseconds. 

var difference = secondDate - firstDate;

我相信，我得到的等同于secondDate.getTime() - firstDate.getTime()。唯一的问题是，在后台如何转换为毫秒数？这是某种运算符重载吗？