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1.项目目录结构
vue-cli2.0与3.0在目录结构方面,有明显的不同
vue-cli3.0移除了配置文件目录,config 和 build 文件夹
同时移除了 static 静态文件夹,新增了 public 文件夹,打开层级目录还会发现, index.html 移动到 public 中
2.配置项
3.0 config文件已经被移除,但是多了.env.production和env.development文件,除了文件位置,实际配置起来和2.0没什么不同
没了config文件,跨域需要配置域名时,从config/index.js 挪到了vue.config.js中,配置方法不变
3.渲染
Vue2.x使用的Virtual Dom实现的渲染
Vue3.0不论是原生的html标签还是vue组件,他们都会通过h函数来判断,如果是原生html标签,在运行时直接通过Virtual
Dom来直接渲染,同样如果是组件会直接生成组件代码
4.数据监听
Vue2.x大家都知道使用的是es5的object.defineproperties中getter和setter实现的,而vue3.0的版本,是基于Proxy进行监听的,其实基于proxy监听就是所谓的lazy
by default,什么意思呢,就是只要你用到了才会监听,可以理解为‘按需监听’,官方给出的诠释是:速度加倍,同时内存占用还减半。
4.按需引入
Vue2.x中new出的实例对象,所有的东西都在这个vue对象上,这样其实无论你用到还是没用到,都会跑一变。而vue3.0中可以用ES module
imports按需引入,如:keep-alive内置组件、v-model指令,等等。