Json相关

1. Json官方网站
   http://www.json.org/
2. JSON.parse
   http://msdn.microsoft.com/en-us/library/windows/apps/cc836466(v=vs.94).aspx      
        

    //layerjson字符串

   var obj = JSON.parse(layerjson); 
   

   //根据索引获得json的值
alert(obj.index); 
   
        

   var jsontext = '{"firstname":"Jesper","surname":"Aaberg","phone":["555-0100","555-0120"]}';
   var contact = JSON.parse(jsontext);
   var fullname = contact.surname + ", " + contact.firstname;
   // The value of fullname is "Aaberg, Jesper"
   
   
   var jsontext = '{ "hiredate": "2008-01-01T12:00:00Z", "birthdate": "2008-12-25T12:00:00Z" }';
   var dates = JSON.parse(jsontext, dateReviver);
   var string = dates.birthdate.toUTCString();
   // The value of string is "Thu, 25 Dec 2008 12:00:00 UTC"
   
   function dateReviver(key, value) {
       var a;
       if (typeof value === 'string') {
           a = /^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2}(?:\.\d*)?)Z$/.exec(value);
           if (a) {
               return new Date(Date.UTC(+a[1], +a[2] - 1, +a[3], +a[4],
                               +a[5], +a[6]));
           }
       }
       return value;
   };