My work summary - 20091209

JSON-JavaScript Object Notation is a lightweight data-interchange format.It is easy for humans to read and write.It is easy for machines to parse and generate.It is based on a subset of JavaScript Language.

JSON is a text format that is completely language independent but uses convention that is familiar to the programmars of the c-family language,including c, c++, java,perl,python ,javascript and many others.These properties make the JSON an ideal data interchange language.

JSON is built on two structures:
  1. A collection of name/value pairs.
  2. A ordered list value.( List,Vector, ArrayList)

These are universal data structures. Virtually all modern programming languages support them in one form or another. It makes sense that a data format that is interchangable with programming languages also be based on these structures.

   var array = eval("[1,2,3]");
   array[0]; // 1
   array[1]; // 2
   array[2]; // 3


   function showJSON() {   
     var user =    
      {    
         "username":"andy",   
         "age":20,   
         "info": { "tel": "123456", "cellphone": "98765"},   
         "address":   
             [   
                 {"city":"beijing","postcode":"222333"},   
                 {"city":"newyork","postcode":"555666"}   
             ]   
      }   
        
     alert(user.username);   
     alert(user.age);   
     alert(user.info.cellphone);   
     alert(user.address[0].city);   
     alert(user.address[0].postcode);   }
 

will focus on the json for details