babel knowledge

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Babel

1、Babel

• It is javascript compiler / decoder / transcoder / resolver

2, Configuration

• .babelrc

命令:
    babel ./index.js -o ./_index.js
下包：
    cnpm install --save-dev babel-cli babel-preset-env
    
    
{
    "presets": [
        "env"
    ]
}

babel-loader // es6转es5