8-12.txt

开发王代码 代码

function Person(myName, myAge) {
	this.name = myName;
	this.age = myAge;
}
Person.prototype.showInfo = function() {
	return ("嗨！我的名字是"+this.name+"，我现在"+this.age+"岁了。");
};
//=================================================
function Child(myName, myAge) {
	this.$super = Person;
	this.$super(myName, myAge);
	//下面覆盖showInfo方法
	this.showInfo = function() {
	  return ("嗨！我是一个小孩，我的名字是"+this.name+"，我现在"+this.age+"岁了。");
	};
}
Child.prototype = new Person();
var child_1 = new Child("Jane", 8);
document.write(child_1.showInfo());