1、运行一下代码，哪一句断言通过？

function Ninja() {this.whoAmI = () => this;
}
var ninja1 = new Ninja();
var ninja2 = {whoAmI: ninja1.whoAmI
}// 通过
console.assert(ninja1.whoAmI() === ninja1, "ninja1 here?")// 不通过
console.assert(ninja2.whoAmI() === ninja2, "ninja2 here?")
// 声明失败：ninja2 here?// 通过
console.assert(ninja2.whoAmI() === ninja1, "ninja1 here?")

2、运行一下代码，哪一句断言通过？

function Ninja() {this.whoAmI = function() {return this;}.bind(this);
}
var ninja1 = new Ninja();
var ninja2 = {whoAmI: ninja1.whoAmI
}// 通过
console.assert(ninja1.whoAmI() === ninja1, "ninja1 here?")// 不通过
console.assert(ninja2.whoAmI() === ninja2, "ninja2 here?")
// 声明失败：ninja2 here?// 通过
console.assert(ninja2.whoAmI() === ninja1, "ninja1 here?")