es6 如何使用装饰器

1.安装

npm i babel-plugin-transform-decorators-legacy --save-dev 

2.配置babel.config.js

[
      "@babel/plugin-proposal-decorators",
      {
        "legacy": true
      }
    ],
    ["@babel/plugin-proposal-class-properties", { "loose": true }]

// 完整如下
module.exports = {
  presets: [
    '@vue/cli-plugin-babel/preset',
    ["@babel/preset-env", { "modules": false }]
  ],
  plugins: [
    [
      "component",
      {
        "libraryName": "element-ui",
        "styleLibraryName": "theme-chalk"
      }
    ],
    [
      "@babel/plugin-proposal-decorators",
      {
        "legacy": true
      }
    ],
    ["@babel/plugin-proposal-class-properties", { "loose": true }]
  ]
}