jsonToString

function jsonToString(obj){  
  var THIS = this;   
  switch(typeof(obj)){  
      case 'string':  
          return '"' + obj.replace(/(["\\])/g, '\\$1') + '"';  
      case 'array':  
          return '[' + obj.map(THIS.jsonToString).join(',') + ']';  
      case 'object':  
           if(obj instanceof Array){  
              var strArr = [];  
              var len = obj.length;  
              for(var i=0; i<len; i++){  
                  strArr.push(THIS.jsonToString(obj[i]));  
              }  
              return '[' + strArr.join(',') + ']';  
          }else if(obj==null){  
              return 'null';  

          }else{  
              var string = [];  
              for (var property in obj) string.push(THIS.jsonToString(property) + ':' + THIS.jsonToString(obj[property]));  
              return '{' + string.join(',') + '}';  
          }  
      case 'number':  
          return obj;  
      case false:  
          return obj;  
  }  
}