代码示例：（标识：jsck_object_prototype）
<!DOCTYPE html>
<html>
<body>
<h1>JavaScript 对象</h1>
<h2>prototype 属性</h2>
<p id="demo"></p>
<script>
function Person(first, last, age, eye) {
this.firstName = first;
this.lastName = last;
this.eyeColor = eye;
}
const myFather = new Person("Bill", "Gates", "blue");
const myMother = new Person("Steve", "Jobs", "green");
Person.prototype.nationality = "English";
document.getElementById("demo").innerHTML =
"My father is " + myFather.nationality + "<br>" +
"My mother is " + myMother.nationality;
</script>
</body>
</html>
