There is no "script" used to build either one of those. Both are companies that have spent a lot of money to build and secure their infrastructure. AFAIK there aren't many open-source web wallets; an example of this would be
Coinbin.
as i want build something same features please ?
Start development from scratch, although I don't see why you'd want to do this.
Yea, I agree with you on the latter part. Because I dont see a reason why I should build a bank when there are banks around but what can I say everybody has his own right to his dream which op had. So I believe that evn the blockchain or coinbase started from someone somewhere dream. If you dream it you can achieve it so they say...