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<!DOCTYPE html>
<html>
<body>
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<h1>JavaScript 对象</h1>
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<p>您不能将新属性添加到构造函数。</p>
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<p id="demo"></p>
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<script>
function Person(first, last, age, eye) {
  this.firstName = first;
  this.lastName = last;
  this.age = age;
  this.eyeColor = eye;
}
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Person.nationality = "English";
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var myFriend = new Person("Bill", "Gates", 62, "blue");
var myBrother = new Person("Steve", "Jobs", 48, "green");
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document.getElementById("demo").innerHTML =
"The nationality of my friend is " + myFriend.nationality; 
</script>
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</body>
</html>
​