webpack Can't resolve 'style-loader'

ERROR in ./~/babel-loader/lib!./~/vue-loader/lib/selector.js?type=script&index=0

Module not found: Error: Can't resolve 'style-loader' in 

当报这个错时，要把：webpack.config.js

从

,{test: /\.css$/, loader: "style-loader!css-loader" }

改为：

,{ test: /\.css$/, loader: "vue-style-loader!css-loader"}