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var firstName = 'Hoang', lastName = 'Pham';
// 2 biến này nằm trong object window
function showName()
console.log(this.firstName + ' '+ this.lastName);
window.showName(); // Hoang Pham. this trỏ tới object window
showName(); //Hoang Pham. Object gọi hàm showName vẫn là object window
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