5.es6转es5

1.安装依赖

cnpm i -D babel-core@6 babel-loader@7 babel-plugin-transform-runtime@6 babel-preset-env@1 babel-preset-stage-0@6 babel-preset-react@6 2.新增文件.babelrc`

{
    "presets":["env","stage-0","react"],
    "plugins":["transform-runtime"]
}