种方式,冒充对象
方式.(利用js里每个思路方法名都是个Function对象) Java代码function Parent(username){
this.username = username;
this.say = function
{alert(this.username);
}
}
function Child(username,password){
this.temp = Parent;//temp指向Parent所指向
地方 
利用js里每个思路方法名都是个Function对象,指向个思路方法this.temp(username);//
化思路方法里内容delete this.temp;//temp没有用了
可以直接删除掉.this不可以丢了//Parent(username);//这样写表面看起来是正确
其实是
只有
出来对象才有this,所以
Parent里this就没有值了 this.password = password;
this.hello = function
{alert(this.password);
}
}
var parent =
Parent("zhangsan");parent.say
;//zhangsanvar child =
Child("lisi","123456");child.say
;//lisichild.hello
;//123456//第
种方式,冒充对象方式.(利用js里每个思路方法名都是个Function对象)function Parent(username){
this.username = username;
this.say = function
{alert(this.username);
}
}
function Child(username,password){
this.temp = Parent;//temp指向Parent所指向
地方 利用js里每个思路方法名都是个Function对象,指向个思路方法this.temp(username);//
化思路方法里内容delete this.temp;//temp没有用了
可以直接删除掉.this不可以丢了//Parent(username);//这样写表面看起来是正确
其实是只有出来对象才有this,所以Parent里this就没有值了this.password = password;
this.hello = function
{alert(this.password);
}
}
var parent =
Parent("zhangsan");parent.say
;//zhangsanvar child =
Child("lisi","123456");child.say
;//lisichild.hello
;//123456 2.第 2种方式:call
方式 call是Function对象个具体使用方法如下 Java代码
//call
是Function对象个//具体使用方法如
function test(str){
alert(this.username + "," + str);
}
var o =
Object;o.username = "zhangsan";
test.call(o,"123456");//zhangsan,123456 .
每个Function 对象都有个call思路方法而名就是个Function对象.call第个参数是test里this.//call
是Function对象个//具体使用方法如
function test(str){
alert(this.username + "," + str);
}
var o =
Object;o.username = "zhangsan";
test.call(o,"123456");//zhangsan,123456 .
每个Function 对象都有个call思路方法而名就是个Function对象.call第个参数是test里this.Java代码
function Parent(username){
this.username = username;
this.say = function
{alert(this.username);
}
}
function Child(username,password){
Parent.call(this,username);
this.password = password;
this.hello = function
{alert(this.password);
}
}
var parent =
Parent("zhangsan");parent.say
;//zhangsanvar child =
Child("lisi","123456");child.say
;//lisichild.hello
;//123456function Parent(username){
this.username = username;
this.say = function
{alert(this.username);
}
}
function Child(username,password){
Parent.call(this,username);
this.password = password;
this.hello = function
{alert(this.password);
}
}
var parent =
Parent("zhangsan");parent.say
;//zhangsanvar child =
Child("lisi","123456");child.say
;//lisichild.hello
;//1234563.第 3种实现方式:apply
方式apply
和call是样只不过参数传递区别而已,apply参数为
Java代码//第 3种实现方式:apply
方式apply和call是样只不过参数传递区别而已,apply参数为//所以继承可以这样实现
function Parent(username){
this.username = username;
this.say = function
{alert(this.username);
}
}
function Child(username,password){
Parent.apply(this,
Array(username));this.password = password;
this.hello = function
{alert(this.password);
}
}
var parent =
Parent("zhangsan");parent.say
;//zhangsanvar child =
Child("lisi","123456");child.say
;//lisichild.hello
;//123456
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