Question

a=[]的原型是什么，原型的原型是什么

Answer 1

var a = [];
var protoOfA = Object.getPrototypeOf(a);
console.log(protoOfA  === Array.prototype) // true

var protoOfProtoOfA = Object.getPrototypeOf(protoOfA);
console.log(protoOfProtoOfA === Object.prototype) // true