原型链继承跟构造函数继承的区别

/*
       借用构造函数
     */

    //Article
    function Article(){
        this.tags = ["js", "css"];
    }
    Article.prototype.getTags = function(){
        return this.tags;
    };

    var article = new Article();

    //BlogPost
    function BlogPost(){}

    BlogPost.prototype = article;//原型继承
    var blog = new BlogPost();

    //StaticPage
    function StaticPage(){
        Article.call(this);//不能继承已经添加到原型中的成员
    }
    var page = new StaticPage();

    console.log(article.hasOwnProperty("tags"));//true
    console.log(blog.hasOwnProperty("tags"));//false
    console.log(blog.hasOwnProperty("getTags"));//false
    console.log(blog.getTags());//["js","css"]
    console.log(page.hasOwnProperty("tags"));//true
    console.log(page.hasOwnProperty("getTags"));//false
    //console.log(page.getTags());//报错