There is currently nothing stopping someone from changing the price in the shopping cart item using the web browsers Inspector. For this reason the script should send a request to the server to confirm the price first then proceed with the checkout process.
Clever hackers can change prices of simpleCart(js) items before checkout. This is a known security flaw that exists with ALL javascript shopping carts. It is highly recommended that all orders be checked upon receiving or backend security checks be put in place (View Tutorial.)"