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Teach you step by step how to use Vue2 code to change to Vue3 (detailed picture and text explanation)
Teach you step by step how to use Vue2 code to change to Vue3 (detailed picture and text explanation)
之前的文章《一招教你使用vscode中插件搞定整个项目的代码替换（收藏）》中，给大家介绍了怎么使用vscode中插件搞定整个项目的代码替换。下面本篇文章给大家介绍怎么使用Vue2代码改成Vue3，伙伴们过来看看吧。
Vue3已经出来有一段时间了，很多朋友早已熟读了文档，写了好几个Demo，馋Composition API等新特性已久了。无奈，在实际工作中，大部分朋友还是不得不守着成千上万行的Vue2老项目过日子，做一次框架升级就像给老房子装修——念头总是充沛，决心总是匮乏。
其实Vue团队已经尽可能地减少了破坏性更新，还提供了一份细致的迁移指南，条数不少，但定睛一看，大部分都是体力活，有些很简单，比如异步组件要多包上一层：
迁移指南的地址：https://v3.cn.vuejs.org/guide/migration/array-refs.html
还有一些就改起来有点麻烦，比如自定义指令生命周期的更名，和传入参数的一些细微变化：
看到这种变化后，作为厌恶重复的程序员，已经开始盘算着能不能写个代码帮我们把这些规则批量给改好了，当然，写转换代码的代码要比写网页难上不少，还好我们之前已经有了一个趁手的工具：GoGoCode的地址https://github.com/thx/gogocode
于是我们梳理了迁移指南里提到的，附带上vue-router \ vuex升级的一些API变化，配合GoGoCode书写了近30条转换逻辑，涵盖了Vue2到Vue3代码break change的大部分场景，这个程序可以帮助你一键把Vue2的代码转换成Vue3的代码。
迁移指南的地址：https://v3.cn.vuejs.org/guide/migration/array-refs.html
上面提到的两条Vue2到Vue3的差异对比中，右侧Vue3的代码就是通过这个工具根据左侧Vue2代码原片直出的，效果还不错吧 ^_^，我们来一起试一下！
尝试一下
全局安装gogocode-cli
npm install gogocode-cli -g
在终端（terminal）中跳转到需要升级的Vue项目路径。如果需要升级src路径下的Vue代码，执行如下命令
gogocode -s ./src -t gogocode-plugin-vue -o ./src-out
转换操作执行完毕后新的Vue3代码会被写入到src-out目录中
我们拿Vue2的官方示例项目vue-hackernews-2.0试了一下，发现在转换的基础上只要稍作改动再改一下构建流程就能跑起来了，一些转换的Diff如下：（查看完整Diff）
Vue2 的官方示例项目 vue-hackernews-2.0地址：https://github.com/vuejs/vue-hackernews-2.0
查看完整Diff地址：https://github.com/thx/gogocode/commit/6506a0e693aff1896da6c8863fa7e7c72d89610f?branch=6506a0e693aff1896da6c8863fa7e7c72d89610f&diff=split
这里只是简单地介绍，完整的方案请参考：https://gogocode.io/zh/docs/specification/vue2-to-vue3
实现比预想的要简单很多
为了达成转换目的，GoGoCode新增支持了对。vue文件的解析，我们可以轻松地获取到解析好的template和scirpt AST节点，并利用 GoGoCode方便的API进行处理。
一些简单的规则，比如前面介绍的异步组件转换直接进行类似字符串的替换即可，由于是基于AST的，所以无需关心代码格式，工作量是很小的：
script
.replace('() => import($_$)', 'Vue.defineAsyncComponent(() => import($_$))')
.replace(
`
() => ({
component: import($_$1),
$$$
})`,
`
Vue.defineAsyncComponent({
loader: () => import($_$1),
$$$
})
`
);这次项目也检验了GoGoCode对复杂情况的处理，就像前面提到的自定义指令生命周期的变化，也很轻松地做到！
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