JavaScript中的“ / 1 /”是什么意思？

Question

I was reading a piece of code on the internet. I saw this line in the javascript code. What is "/1/" and "/0/" used for in the following code statements??

    var firstDate = new Date(String(monthNum) + "/1/" + String(yearNum));
    var lastDate = new Date(String(monthNum + 1) + "/0/" + String(yearNum));

Answer 1

"/1/" and "/0/" are nothing except string literals.

You are concatenating these two strings with your month and year string (formed by calling String() , although I think they are not needed) to construct a particular date string.