Lab 1 - Typos or minor bugs in the example JS code

[PengKuang]

In the file "lab1.html", on line 316 (the last block of the Loop section), the assignment code should be:
val = Math.random();

In the file "lab1.html", on line 556, the declaration of the manufacturer should be:
let manufacturer = 'Tesla';
so the setManufacturer(m) method will work.