修改方式：在build/utils的ExtractTextPlugin.extract里加上 publicPath: ‘../../‘：
// Extract CSS when that option is specified
// (which is the case during production build)
if (options.extract) {
return ExtractTextPlugin.extract({
use: loaders,
fallback: ‘vue-style-loader‘,
publicPath: ‘../../‘ //加这里
})
} else {
return [‘vue-style-loader‘].concat(loaders)
｝
原文：https://www.cnblogs.com/peter-web/p/12889005.html