继承

/** * 原型继承 * @param {Object} o */var create = Object.create || function(o){ var T = function(){}; T.prototype = o; return new T(); };/** * 寄生组合式继承 * @param {Object} subType * @param {Object} superType */var inheritPrototype = function(subType, superType){var proto = create(superType.prototype);proto.constructor = subType;subType.prototype = proto;};//------------------范例----------------------var SuperType = function(name){this.name = name;this.colors = ['a', 'b'];};SuperType.prototype.sayName = function(){alert(this.name);};var SubType = function(name, age){//调用父类构造函数，实现成员初始化SuperType.call(this, name);this.age = age;};//继承父类SuperTypeinheritPrototype(SubType, SuperType);SubType.prototype.sayAge = function(){alert(this.age);};