JS中 原型模式与构造模式

function Blog(name, url) {
this.name = name;
this.url = url;
this.alertUrl = function() {
alert(this.url);
}
}

var blog = new Blog('wuyuchang', 'http://www.jb51.net/');
console.log(blog instanceof Blog);  // true， 判断blog是否是Blog的实例

function Blog() {
}

Blog.prototype.name = 'wuyuchang';
Blog.prototype.url = 'http://tools.jb51.net/';
Blog.prototype.friend = ['fr1', 'fr2', 'fr3', 'fr4'];
Blog.prototype.alertInfo = function() {
alert(this.name + this.url + this.friend );
}

// 以下为测试代码
var blog = new Blog(),
blog2 = new Blog();
blog.alertInfo();  // wuyuchanghttp://tools.jb51.net/fr1,fr2,fr3,fr4
blog2.alertInfo();  // wuyuchanghttp://tools.jb51.net/fr1,fr2,fr3,fr4