JavaScript 的继承

//定义 People 对象
var People = function () { };
People.prototype = {
Height: 175,
Walk: function () {
alert("People are walking...");
}
}
//定义 Me 对象
var Me = function () { };
//设置 Me 的 prototype 属性为 People 对象
Me.prototype = new People();
//将创建 Me 对象的引用指回给 Me
Me.prototype.constructor = Me;
//修改 Height 属性
Me.prototype.SetHeight = function (v) {
Me.prototype.Height = v;
}
//新增 Stop 动作
Me.prototype.Stop = function () {
alert("I'm Stop.");
}
var m = new Me();
//结果为 People are 175cm tall.
alert("People are " + m.Height + "cm tall.");
m.SetHeight(185);
//结果为 I'm 185cm tall.
alert("I'm " + m.Height + "cm tall.");
//结果为 People are walking...
m.Walk();
//结果为 I'm Stop.
m.Stop();
var y = new Me();
//结果为 You're 185cm tall.
alert("You're " + y.Height + "cm tall.");