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<!DOCTYPE html>
<html>
<body>
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<h1>JavaScript <b>this</b> 关键词</h1>
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<p>在本例中，<strong>this</strong> 引用 person2，即使它是 person1 的方法：</p>
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<p id="demo"></p>
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<script>
var person1 = {
  fullName: function() {
    return this.firstName + " " + this.lastName;
  }
}
var person2 = {
  firstName:"Bill",
  lastName: "Gates",
}
var x = person1.fullName.call(person2); 
document.getElementById("demo").innerHTML = x; 
</script>
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</body>
</html>
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