格式-未定义不是Date对象的函数

Question

I have following code:

 var actualDate=new Date();
 actualDate.format("YYYY-mm-dd HH-MM-ss.l");

My browser complains about second row:

Uncaught TypeError: undefined is not a function

How to fix this issue?

Answer 1

JavaScript Date objects don't have a format function built in. If you want one, you'll have to add it to Date.prototype , either directly or via a library.

It's not just a name thing, either: JavaScript's Date objects just don't have a formatting function at all. They have various functions you can use to build one, and they give you toString , toUTCString , toLocaleString , and toISOString , but those don't let you control the format.