js如何實現繼承及其優缺點

//父類  

function person()  
}  //子類  
function man()  
man.prototype = new person();  
var one = new man();  
console.log(one.feature); //['beard','strong']  
console.log(one.hair); //black  
console.log(one.eye); //black  
console.log(one.skin); //yellow  
console.log(one.view()); //black,black,yellow

//父類  

function person()  
}  //子類  
function man()  
var one = new man();  
console.log(one.feature); //['beard','strong']  
console.log(one.hair); //black  
console.log(one.eye); //black  
console.log(one.skin); //yellow  
console.log(one.view()); //black,black,yellow

//父類  

function person()  
}  //子類  
function man()  
man.prototype = new person();  
var one = new man();  
console.log(one.feature); //['beard','strong']  
console.log(one.hair); //black  
console.log(one.eye); //black  
console.log(one.skin); //yellow  
console.log(one.view()); //black,black,yellow

//父類  

function person(hair,eye,skin)  
}

function man(hair,eye,skin)

//call方式

//子類

function man(hair,eye,skin)

經此種種，最好的繼承方式就是call+prototype方式了，之後你可以試一下(one instanceof baseclass)的值是否為true。 

第三種繼承方式也有缺陷：子類new物件時要傳一遍父類所需的引數，而且會重現父類中的屬性和方法，下面這種繼承方式才是完善的：

function person(name)  

person.prototype.getname = function()   
function chinese(name, nation)   
//繼承方法  
function inherit(subclass, superclass)   
f.prototype = superclass.prototype;  
subclass.prototype = new f();  
subclass.prototype.constructor = subclass.constructor;  
}  inherit(chinese, person);  
chinese.prototype.getnation = function() ;  
var p = new person('shijun');  
var c = new chinese("liyatang", "china");  
console.log(p); // person   
console.log(c); // chinese   
console.log(p.constructor); // function person(name){}  
console.log(c.constructor); // function chinese(){}  
console.log(c instanceof chinese); // true  
console.log(c instanceof person); // true

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