Question

这段代码如何知道今天是星期二？

var today = new Date ();
var day = today.getDay();
var daylist = ["Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"];
console.log("Today is : " + daylist[day] + ".");

Answer 1

您应该阅读.getDay()的手册：

getDay()返回的值是与星期几对应的整数：星期日为0，星期一为1，星期二为2，依此类推

以上解释了所有。 Date对象从系统获取当前日期（和时间），这是基本的事情，然后包含有关日，月，年，周，周数等的所有详细信息。此外，调试您的代码，它具有以下内容：

var today = new Date();
// Returns `Tue Jan 05 2016 16:30:25 GMT+0000 (GMT Standard Time)`.
var day = today.getDay();
// Returns `2`, meaning it is Tuesday.
var daylist = ["Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"];
// Okay, your array.
console.log("Today is : " + daylist[day] + ".");
// This is translated to `daylist[2]`, and Daylist's `2` has Tuesday.

更好地理解JavaScript

1 个答案: