JavaScript implements a simple example of inheritance _javascript tips

As an object-oriented language, then the inheritance of nature is a big feature, the following is a very simple code example, it demonstrates the rationale for inheritance, interested or just want to learn this aspect of friends can refer to, hope to be able to help the group.

Inherited
function Person (name,sex)
{
 this.name=name;
 this.sex=sex;
}
Person.prototype.sayname=function ()
{
 alert (this.name);
}
Person.prototype.saysex=function ()
{
 alert (this.sex);
}
function Worker (name,sex,job)
{
 //Inherit person class 
 Person.call (this,name,sex)//Here This refers to an instance of the Worker class, As in the following ' W ', the W is passed into the person constructor, and W is disguised as this
 this.job=job
in the person constructor. worker.prototype=person.prototype;//if such a negative stereotype is used, the subclass's Sayjob method person parent class also has a Sayjob method, because the subclass does not affect the parent class because it is a reference pass
//change to the following way: For
(var i in Person.prototype)
{
 worker.prototype[i]=person.prototype[i];
}
Worker.prototype.sayjob=function ()
{
 alert (this.job);
}
var p=new person (' Lisi ', ' Male ');
alert (p.sayjob);
var w=new Worker (' Zhangsan ', ' male ', ' soy sauce ');
W.sayname ();
W.saysex ();
W.sayjob ();

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