JS Date object undefined

Question

I've written a function in JavaScript that returns, each time you invoke it, a new instance of this Object. Among its properties, this instance has a date property, which is being initialized when 'starting' this object (it's a server object):

instance.startedTime = new Date();

Later on, I have a function that returns this server instance' properties. When calling it, it returns 'undefined' for the instance.startedTime property.
Why is that, and how can I pass the date properly?

Answer 1

为什么不只节省时间呢？

instance.startedTime = (new Date).getTime();