求助，给object的key值加一个前缀，如何用js或jq实现

问题描述：

var obj = {"a":1,"b":2}
var obj2 = {"qqq.a":1,"qqq.b":2}
想通过js方法，让obj的每个key值加一个前缀qqq，变成obj2？
求教各位大虾指点下

答

var obj = {"a":1,"b":2};
var obj2 = {};
Object.keys(obj).forEach(key => obj2['qqq.'+key] = obj[key]);
console.log(obj2)

答

var obj2 = { }
obj2.qqq = obj;

答

受1楼的启发，也可以这样实现：
var obj = {"a":1,"b":2};
var obj2 = {};
$.each(obj,function(key,value){
obj2["qqq."+key] = value
});
console.info(obj2)