小编hua*_*hui的帖子

在这段代码中:

var Fruit = function() {}

Fruit.prototype = {
    color: function () {
        console.log('Fruit color...')
    }
}

var Apple = function () {}

Apple.prototype = new Fruit()
Apple.prototype.constructor = Apple

var a = new Apple()
Apple.prototype = null // the question!!!
a.color()

何时Apple.prototype设置为null,为什么实例a仍然可以调用该color方法？