use extend
var object = $.extend({}, object1, object2);
by passing an empty object as the target(first) argument you can preserve both the objects if however you want to merge the second object you can do it like
$.extend(object1, object2);
DEMO
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…