vue.js学习笔记之prototype

javascript中有prototype属性，我了解到的有两种用法：

一、prototype可以给对象动态的添加属性或者方法，如：

<script>    function student(stuname,age,classname){        this.stuname = stuname;        this.age = age;        this.classname = classname;    }    var stu1 = new student("yovan",21,"软件七班");//实例化学生对象    student.prototype.php_score = null;//利用prototype给student中添加一个php_score属性    stu1.php_score = 99;    console.log(stu1.php_sorce);//99</script>

二、prototype可以做到类似Java继承那样，如：

<script>    function mytest1(parameter){        this.testNum = parameter;   };   function mytest2(parameter){        this.testString = parameter;   };    //用mytest2的prototype去实例化mytest1，继承了mytest1里面的testNum属性    mytest2.prototype = new mytest1(2017);     var objectTest2 = new mytest2("hello");    console.log(objectTest2.testString+","+objectTest2.testNum);//hello,2017</script>