Jquery is having inbuilt function called  extend,
 which can be used to merge two objects values in a single object.

var data1 = {
   duration: 100
};
    
var data2 = {
   duration: 110
};

console.log("Before Data1 " + JSON.stringify(data1));
console.log("Before Data2 " + JSON.stringify(data2));

/* merge data2 into data1 */
    $.extend(data1, data2);

console.log("After Data1 " + JSON.stringify(data1));


console.log("After Data2 " + JSON.stringify(data2));

OUTPUT : 

  
  

Happy Coding :)