我在研究如何使用Google Chrome扩展程序显示桌面通知时,发现了以下代码:
var time = /(..)(:..)/(Date()); // The prettyprinted time.
var hour = time[1] % 12 || 12; // The prettyprinted hour.
var period = time[1] < 12 ? 'a.m.' : 'p.m.'; // The period of the day.
这到底是干什么的?