I am new to suitescript. And I have a suitelet which is bind to a client script , I want to save the data when click submit.
You probably want to explain this better, I cant tell if you have a client script calling a suitelet, or if you have a suitelet with a client script. Its always best to include your code in your question. You should also explain what your data is and what you want to save it as.
Suitelets are stateless code executions. If you need to save data you need to write to a record of some sort. Could be a custom record, could be a JSON file, could be transaction… really depends on what your situation is.