npm安裝react-dom...

npm install webpack webpack-dev-server  react react-dom babel-preset-react babel-preset-es2015 babel-loader babel-core babel-preset-stage-0 babel-preset-stage-1 babel-preset-stage-2 babel-preset-stage-3 postcss-cli autoprefixer style-loader css-loader autoprefixer-loader extract-text-webpack-plugin webpack-encoding-plugin -g