js hook

JSON

var my_stringify= JSON.stringify;
JSON.stringify = function (params){
     console.log("xxx",params);
      return my_stringify(params);  
};

var my_parse = JSON.parse;
JSON.parse = function (params){
     console.log("xxx",params);
      return my_parse(params);  
};

cookie

var cookie_cache = document.cookie;
Object.defineProperty(document,'cookie',{
     get:function(){
         console.log('Getting cookie');
         return cookie_cache;
     }, 
     set : function(val){
         console.log('Setting cookie',val);
         var cookie = val.split(';')[0];
         var ncookie = cookie.split("=");
         var flag = false;
         var cache = cookie_cache.split("; ");
         cache = cache.map(function(a){
                 if (a.split("=")[0] === ncookie[0]){
                        flag = true;
                        return cookie;
                  }
                return a;
          })

           cookie_cache = cache.join("; ");
          if (!flag){
               cookie_cache += cookie + "; ";

          }
          this._value = val;
          return cookie_cache;


     }
})