Developers console saying function is "undefined" but the function runs fine
I'm a web developer, and I've been working on creating a site ( http://mythicalslab.x10host.com/ ). On the site I have some javascript that handles displaying a div with a loading animation on it. In script html tags, I have two function defined, hideLoading() and showLoading() which respectively show and hide the loading animation.
If I go into the Javascript console in Firefox, and either type hideLoading() or showLoading(), the console says "undefined", but it still runs the function correctly.
If you want to check this put for yourself, go to my homepage ( http://mythicalslab.x10host.com/ ) and type showLoading() in the dev console, and you'll see it will run the function and show the loading animation, while saying it is undefined.
由Mythical于修改
被采纳的解决方案
Undefined is about the return value of a function call. You only see something useful when a function returns value. If nothing is returned then you see undefined.
- (function (){return("OK")})()
- (function (){})()
所有回复 (5)
http://mythicalslab.x10host.com/ I do not see any textbox on that page at all. I accessed the page with two completely different browsers. Where is this dev console?
选择的解决方案
Undefined is about the return value of a function call. You only see something useful when a function returns value. If nothing is returned then you see undefined.
- (function (){return("OK")})()
- (function (){})()
由cor-el于修改
cor-el said
Undefined is about the return value of a function call. You only see something useful when a function returns value. If nothing is returned then you see undefined.
- (function (){return("OK")})()
- (function (){})()
Oooh, okay, I thought it was saying whether the console ran the function correctly or not.
finitarry said
http://mythicalslab.x10host.com/ I do not see any textbox on that page at all. I accessed the page with two completely different browsers. Where is this dev console?
I'm talking about the developers console built-into Firefox in the developer tools window.
Right, I forgot about that. I do not use that very often. I see a lot of complaints about graphical settings such as: Expected declaration but found '/'.