keep-alive 新增的两个函数 activated deactivated，以及include exclude

include：缓存；
exclude：不缓存；
<keep-alive include="test-keep-alive"><!-- 将缓存name为test-keep-alive的组件 --><component></component>
</keep-alive><keep-alive include="demoA,demoB"><!-- 将缓存name为a或者b的组件，结合动态组件使用 --><component :is="view"></component>
</keep-alive><!-- 使用正则表达式，需使用v-bind -->
<keep-alive :include="/demoA|demoB/"><component :is="view"></component>
</keep-alive><!-- 动态判断 -->
<keep-alive :include="includedComponents"><router-view></router-view>
</keep-alive><keep-alive exclude="test-keep-alive"><!-- 将不缓存name为test-keep-alive的组件 --><component></component>模块缓存后悔新增两个方法activated （进入页面时调用）deactivated（离开页面时调用），主要实现方式是监听路由变化