// this指向问题
var name = 'window'
var obj1 = {
    name: 'obj1',
    foo1: function () {
        console.log()
        return () => {
            console.log()
        }
    },
    foo2: () => {
        console.log()
        return function () {
            console.log()
        }
    }
}
var obj2 = {
    name: 'obj2'
}
// 写出以下执行结果
obj1.foo1.call(obj2)()//obj2 obj2
obj1.foo1().call(obj2)// obj1 obj1
obj1.foo2.call(obj2)()// window window
obj1.foo2().call(obj2)// window obj2