One of the JavaScript class inheritance implementations

Online blog Forum appeared a lot of JavaScript class inheritance methods, browse some, not without comments, is not running effect, so I wrote a simple and understandable version, with the test code at the bottom.

The article has just been accidentally deleted, so it is re-made, and the example is strengthened.

(function () {

Function.prototype.extend = function (BaseClass) {

This is a function object.
var oldprototype = This.prototype, Newprototype = {}, _super = new BaseClass ();

Inherits all properties and methods.
for (var name in _super) {
Newprototype[name] = _super[name];
}

for (var name in Oldprototype) {
Only override the properties in this new Class.
if (Oldprototype.hasownproperty (name)) {
only function need _super.
if (typeof oldprototype[name] = = "function" && typeof _super[name] = = "function") {
Newprototype[name] = (function (name, FN) {
return function () {
var tmp = This._super;

Set Super method
This._super = _super[name];

var ret = fn.apply (this, arguments);

This._super = tmp;

return ret;
};
}) (name, Oldprototype[name]);
}
}
}

This.prototype = Newprototype;

return this;
};
})();

var A = function () {
This.hello = function () {
Console.log ("Hello, I ' m A");
}
};

var B = function () {};

B.prototype = {
Hello:function () {
This._super ();

Console.log ("Hello, I ' m B");
}
};

B.extend (A);

var C = function () {};

C.prototype = {
Hello:function () {
This._super ();

Console.log ("Hello, I ' m C");
}
};

C.extend (B);

var B = new B ();
var c = new C ();

B.hello ();
C.hello ();

One of the JavaScript class inheritance implementations