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vue2中是通过Object.definedProperty()来实现数组的劫持，
* 当vue初始化数据上的对象之后，在控制台打印可以看到有get和set方法，get是在读取属性值触发的函数，set是设置属性值触发的函数。 var
Book = {} var name = ''; Object.defineProperty(Book, 'name', { set: function
(value) { name = value; console.log('你取了一个书名叫做' + value); }, get: function () {
return '《' + name + '》' } }) Book.name = 'vue权威指南'; // 你取了一个书名叫做vue权威指南
console.log(Book.name); // 《vue权威指南》 -- set设置name属性值时触发，get读取name值时触发
* 实现简易版的数据绑定
*
通过Object.definedProperty()对属性设置一个set函数，当数据改变时就触发这个函数，自定义一些需要更新的方法放在set函数中即可实现data更新view
* 实现的思路
自定义双向绑定的实现过程
* 首先对数据进行劫持监听，设置一个监听器Observer，来监听所有的属性。-- 当属性发生变化时，告诉订阅者Watcher来查看是否需要更新。
* 此时订阅者Watcher接收到相应的属性变化，就可以执行对应的更新函数来更新视图。
* 之后我们需要一个指令解析器Compile，对每个节点元素进行扫描和解析，将相关指令对应初始化成一个订阅者Watcher，并替换模板数据或绑定相应的函数。
* 订阅者不是一个，是多个，这种情况下需要一个消息订阅器Dep来专门的收集订阅者们，然后在监听器Observer和订阅者Watcher之间进行统一的管理。
Observer、Watcher、Dep、Compile之间的关系图
