underscore中对于对象相等判断

Question

var aCtor = a.constructor, bCtor = b.constructor;
  if (aCtor !== bCtor && !(_.isFunction(aCtor) && aCtor instanceof aCtor &&
                           _.isFunction(bCtor) && bCtor instanceof bCtor)
                      && ('constructor' in a && 'constructor' in b)) {
    return false;
  }
 

这里为什么要这么判断两个对象是否相等？ 代码来自underscore中的Equal函数
这里的a，b待判断的对象

Answer 1

推荐看看这篇 干活