Why I get error?

Question

This code is not working:

var c,
var w = c.width = window.innerWidth,
h = c.height = window.innerHeight;

Answer 1

Because the declaration for c is ambiguous unless you specify it explicitly as an object with the corresponding attribute like following:-

var c = { width: null, height: null };

Anyway it's still a little bit strange to me to have more than one assignment in a single statement although it's working fine.

Answer 2

Андрей Назаров sorry but that is wrong,if you say
c=document.querySelector("canvas");
c already automatically has width and height properties
so by saying
c={width:null,height:null}
youre changing c value completely making line1 useless.We all make mistakes,youll have to choose between both

Answer 3

ive seen your code,after 5 minutes of adjustment,ive repaired it:

https://code.sololearn.com/WF1E2fJ9CWbn/?ref=app

Answer 4

because c doesnt have any width or height properties but from no where you just decided c should have one.
var c={
width:5,height:10 }
or perhaps c is an html dom element
like
c=document.querySelector("canvas");
//now try your code

Answer 5

thank you gays i'll trying

Answer 6

correct code:
var c = document.querySelector("canvas");
var c = { width: null, height: null };

var w = c.width = window.innerWidth,
h = c.height = window.innerHeight;

Answer 7

it works!
Thank you for help!😁