1. It's a text, so it's very easy for network transmission. -- faster.
- get JSON Data String from server: request.reponseText
2. It could also be easily converted into an object, which is very convenient for data manipulation. --convenient.
- var itemDeatils = eval( '(' + JSON_DATA_STRING + ')'); //JavaScript's build-in function eval() could easily turn JSON Data String that you got from server into an object.
- now you could use dot notaion on "itemDetails" now.
