this

this是什么？this是指针？指针指向实例化的对象？都太抽象，this其实就是一个变量，是一个对象

var that = {
Animal: function (name) {
this.name = name
this.sayName = function () {
console.log(this.name)
}
}
}
that.Animal(‘Black Cat’)
that.sayName() // Black Cat