Ninety-nine cans of pineapple jucie

To declare a variable in Javascript, use "var" and then the name of the variable after it along with what it will be assigned to, ex. var cheese = "cake".
The python equivalent of a colon (:), to Javascript are brackets ({}) you use a open bracket to start the indentation and a closed bracket to end it.
A while loop in Javascript looks like this: while (cans > 0) {