js原生继承之——原型式继承实例

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   <meta charset="UTF-8">
   <title>prototypeInherit</title>
   <script type="text/javascript">
   //原型式继承：实质上就是类式继承的函数封装(但有缺陷)
   function inheritObject(obj){
       //声明一个过渡函数对象
       function _f(){}
       _f.prototype = obj;
       return new _f();
   }
   var book = {
       name:'js book',
       alike:['css','html']
   }
   var newbook = inheritObject(book);
   newbook.name = 'ajax book';
   console.log(newbook.name);      //'ajax book'
   newbook.alike.push('js');
   console.log(newbook.alike);     //["css", "html", "js"]

   var combook = inheritObject(book);
   console.log(combook.name);      //'js book'
   console.log(combook.alike);     //["css", "html", "js"]newbook中修改加入的'js'元素，combook中也共享了
   //小结：原型继承中——父对象的直接属性被分别拷贝，数组类结构属性会被共用。(推荐使用类式继承，继承的比较完美，每个实例都是独立对象，又都继承了父类的直接属性和原型prototype属性)
   //本例已经通过验证
   </script>
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