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var Person = function(name, age) {
this.name = name;
this.age = age;
};
//Now create three instances of Person with data you make up
var p1 = new Person('Aaron', 32);
var p2 = new Person('Casey', 30);
var p3 = new Person('Greg',31);
//Now add a sayName method on your Person class that will alert the name of whatever Person instance called it.
我不确定如何向现有类添加方法。我是 JavaScript 的新手。我了解如何添加新属性而不是新功能。