babel 转es5
"@babel/core": "^7.0.0",
"@babel/plugin-transform-runtime": "^7.3.4",
"@babel/preset-env": "^7.3.4",
"@babel/runtime": "^7.3.4",
"babel-loader": "^8.0.5"
.babelrc:
{
"presets":[
["@babel/preset-env",{
"targets":{
"browsers":[">1%","last 2 versions"]
}
}]
],
"plugins": ["@babel/transform-runtime"]
}
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