title: What is the difference between add and put in indexeddb?
body: <p>I am just starting to use indexeddb and transforming Web SQL. </p>
  
  <p>I tried to use add and put to add some data in data store. I could not really see what is/are the difference/s of using these two functions. </p>
  
  <p>I think I have to know the difference so I could use them appropriately. </p>
  
  <p>Thanks forward</p>