this

function foo() {
  console.log(this);
}
var obj1 = {
  name: 'obj1',
  foo: foo,
};
var obj2 = {
  name: 'obj2',
  obj1: obj1,
};
obj2.obj1.foo();

function foo() {
  console.log(this);
}
var obj1 = {
  name: 'obj1',
  foo: foo,
};

var bar = obj1.foo;
bar();

var obj = {
  bar: function () {
    var x = () => this;
    return x;
  },
};

var fn = obj.bar();

console.log(fn() === obj);

var fn2 = obj.bar;
console.log(fn2()() == window);

var name = 'window';
var obj = {
  name: 'hello',
  getName() {
    console.log(this.name);
  },
};
function getName() {
  var objGetName = obj.getName;
  objGetName();
  obj.getName();
  obj.getName();
  (true && obj.getName)();
}
getName();

var name = 'window';
var obj = {
  name: 'obj',
  getName1() {
    console.log(this.name);
  },
  getName2: () => console.log(this.name),
  getName3() {
    return function () {
      console.log(this.name);
    };
  },
  getName4() {
    return () => {
      console.log(this.name);
    };
  },
};
var obj2 = { name: 'obj2' };
obj.getName1(); // obj
obj.getName1.call(obj2); // obj2
obj.getName2(); // window
obj.getName2.call(obj2); // obj2  xxxxxxxxxxxxxxxxxxxxxxx window
obj.getName3()(); // window
obj.getName3.call(obj2)(); // window
obj.getName3().call(obj2); // obj2
obj.getName4()(); // obj
obj.getName4.call(obj2)(); // obj2
obj.getName4().call(obj2); // obj2  xxxxxxxxxxxxxxxxxxxxxxx obj