说明:Vue2
初始化流程
初始化属性,变量方法,监听事件等等=> $mount => mountComponent => new Watcher和_update
数据响应式
observe => new Observer => dep => setter最终触发watcher._update
枚举:方法变异
批量初步更新
watcher.update => queueWatcher => queue.push(watcher) + nextTick (
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