[英]How to do prototypal inheritance in JavaScript?
I've tried several ways but I couldn't do it.我尝试了几种方法,但我做不到。
On the next example I want the Soldier gets all properties of Person, and allowing to add more properties.在下一个示例中,我希望士兵获得 Person 的所有属性,并允许添加更多属性。 How to do it correctly?
如何正确地做到这一点?
function Person(name, age) {
this.name = name;
this.age = age;
}
Person.prototype.hi = function (message) {
console.log(message + "!!!");
};
var Soldier = new(Person); // it is not the way to do it
Soldier.prototype.good_hi = function (message) {
console.log("Sir! " + message + ", sir!");
};
You don't have a Soldier
constructor.你没有一个
Soldier
构造函数。 You need to make that first.你需要先做到这一点。 Then you'd apply the
Person
constructor to new Soldier
instances.然后将
Person
构造函数应用于新的Soldier
实例。
function Person(name, age) {
this.name = name;
this.age = age;
}
Person.prototype.hi = function (message) {
console.log(message + "!!!");
};
function Soldier(name, age) {
Person.apply(this, arguments);
}
Soldier.prototype = Object.create(Person.prototype); // is better
Soldier.prototype.constructor = Soldier;
Soldier.prototype.good_hi = function (message) {
console.log("Sir! " + message + ", sir!");
};
Then use it like this:然后像这样使用它:
var s = new Soldier("Bob", 23);
s.good_hi("Hello");
DEMO: http://jsfiddle.net/3kGGA/演示: http : //jsfiddle.net/3kGGA/
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