[HMR] Update check failed: Error: Failed to execute 'open' on 'XMLHttpRequest': Invalid URL

console 2017-10-15 下午5.02.13.png

package.config.js

module.exports = {
  output: {
    publicPath: 'http://localhost:3001'
  }
}

纠错：

publicPath路径那里丢失了一个语法斜杠

module.exports = {
  output: {
    path: path.join(__dirname,'/dist/'),
    filename: '[name].js',
    publicPath: 'http://localhost:3001/'
  }
}