日期:2014-05-16 浏览次数:20391 次
1.单继承,使用call()方法
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//父类
function Father(name,age)
{
this.Name = name;
this.Age = age;
this.Intro = function()
{
alert("hello, I am" + this.Name);
}
}
//子类
function Child(name,age)
{
Father.call(this,name,age);//实现继承!并且调用父类的构造方法,this是当前对象
// Father.apply(this, new Array(name,age)); //跟call一样的功能
this.Code = function()
{
alert("I am coding");
}
}
var father = new Father("father",50);
var child = new Child("child",23);
father.Intro();
child.Intro(); //子类调用继承自父类的方法
child.Code(); //子类调用自己的方法
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2.单继承?
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//父类
function Father(name,age)
{
this.Name = name;
this.Age = age;
this.Intro = function()
{
alert("hello, I am" + this.Name);
}
}
//子类
function Child(name,age)
{
this.Constructer = Father; //指定方法为上面那个父类的那个方法,跟下面的方法合起来实现继承
this.Constructer(name,age); //调用该方法:注意调用的时候,是Child对象调用,那么调用完,Child的2个属性也就赋值了,而且多了1个方法
delete this.constructor; // 删除这个方法,是因为不想覆盖父类的相关方法和属性?
this.Code = function()
{
alert("I am coding");
}
}
var father = new Father("father",50);
var child = new Child("child",23);
father.Intro();
child.Intro(); //子类调用继承自父类的方法
child.Code(); //子类调用自己的方法
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3.多继承
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//父类1
function Father(name,age)
{
this.Name = name;
this.Age = age;
this.Intro = function()
{
alert("hello, I am" + this.Name);
}
}
//父类2
function Father_2(pay)
{
this.Pay = pay;
this.showPay = function()
{
alert("your pay is " + this.Pay);
}
}
//子类
function Child(name,age,pay)
{
this.Constructer = Father; //指定方法为上面那个父类的那个方法
this.Constructer(name,age); //调用该方法:注意调用的时候,是Child对象调用,那么调用完,Child的2个属性也就赋值了,而且多了1个方法
delete this.Constructor; // 删除这个方法,是因为不想覆盖父类的相关方法和属性?
this.Constructer2 = Father_2;
this.Constructer2(pay);
delete this.Constructer2;
this.Code = function()
{
alert("I am coding");
}
}
var father = new Father("father_1",50);
var fater_2 = new Father_2(5000);
var child = new Child("zxh",23,10000); //I am coding.
father.Intro(); //hello, I am father'_1
child.Intro(); //调用从第一个父类继承的方法 hello,I am zxh.
child.Code(); //I am coding
child.showPay(); //调用从第二个父类继承的方法 your pay is 10000
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4.多继承2
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//父类构造方法
function Father(name,age)
{
this.Name = name;
this.Age = age;
}
//父类的方法
Father.prototype.Intro = function()
{
alert("I am father");
}
//子类构造方法
function Child(name,age)
{
Father.call(this,name,age); //调用父类构造方法,得到各个属性
}
Child.prototype = new Father(); //实现继承
//定义子类自己的方法
Child.prototype.Code = function()
{
alert("I am coding !");
}
//覆盖父类的方法[如果不指定上面的继承,其实也就相当与自己新定义一个一样]
Child.prototype.Intro = function()
{
alert("I am " + this.Name);
}
var father = new Father();
var child = new Child("zxh",23);
father.Intro(); //父类调用自身方法
child.Intro(); //子类调用覆盖父类的方法
child.Code(); //子类调用自己定义的方法
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