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理解 Vue 的生命周期是尤为重要的，不仅是在于对 Vue 的理解，或者是实际项目中，对 Vue 的使用，都离不开 Vue 的生命周期。
Vue 生命周期首先，先来看看Vue官网这张图（ Vue 2.x 生命周期）
一切都是从创建 Vue 的实例开始的，实例创建完成后，进行数据响应、模板编译、指
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Node 事件循环（Event-Loop）
Node.js 是通过事件驱动来服务 I/O 的，而事件循环是 Node 实现异步非阻塞 I/O 的基础
Node 事件循环是基于 libuv 实现的，而内部实现，其实就是一个 while 语句块Node 程序启动时，则会初始化事件循环
这里需要说明下，
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前言：在 JavaScript 中，数组是很重要的数据类型，在日常工作中也必不可少，但是对于数组的各种方法 API 却了解不多，或者是只知其名，不知其何用。本文主要是归纳总结各种数组方法，包括 ES5 和 ES6 中新增的
数组数组对象是一个有序的数据（数据可以是 原始类型 或 对象类型）集合。
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原型每一个对象都有一个显式原型（prototype）和一个隐式原型（proto）。隐式原型引用了创建这个对象的函数的原型 prototype
1fn.__proto__ === Fn.prototype
一个对象实例的 proto 和 创建这个对象实例的函数的 prototype 是一样的
123t
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React 生命周期主要有三个过程：装载（Mount）过程、更新（Update）过程、卸载（Unmount）过程
首次装载组件时，执行 constructor、getDefaultProps、getInitialState、componentWillMount、render、componentD
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