this指向面试题总结

var name = 222
var a = {
name: 111,
say: function () {
console.log(this.name)
}
};
var fun = a.say; 
fun();
a.say();
var b = {
  name: 333,
say: function (fun) {fun()}
}
b.say(a.say)
b.say = a.say
b.say()