javascript类继承

function extend(subClass, superClass) {

    var f = function() {};

    f.prototype = superClass.prototype;

    subClass.prototype = new f();

    subClass.superClass = superClass.prototype;

}

var parent = function (name, age) {

    this._name = name;

    this._age = age;

};
parent.prototype.show = function () {

    console.info(this._name + " : " + this._age);

};
var son = function(name,age,height) {

    this._height  = height;

    son.superClass.constructor.call(this,name,age);

};
extend(son, parent);

//这里没有重写父类也就是parent的show方法

son.prototype.show=function() {
console.info(this._name + " : " + this._age+" : "+this._height);

};

var s1 = new son("jack",12,120);
s1.show();
var p1 = new parent("father",40);

p1.show();

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