怎么判断两个对象是否完全相等

function evalObj(obj1,obj2){
  let isEval = true;
  _next(obj1,obj2);
  //再反向next是 为了解决 形如evalObj({a:123},{a:123,b:{c:123}})返回true的问题
  _next(obj2,obj1);
  function _next(objx,objy){
    for(let item in objx){
        if(objx[item] instanceof Object){
            if(objy[item]){
                _next(objx[item],objy[item]);
            }else{
                isEval = false;
            }
        }else if(objx[item]!==objy[item]){
            isEval = false;
        }
    }
  }     
  return isEval;
}