$ npm install html-loader --save-dev 安装成功后执行webpack

 <%= require('html-loader!./html-header.html') % 这个语句的<%=%>是失效的

ERROR in   Error: Child compilation failed:
  Cannot find module 'clean-css'

Child html-webpack-plugin for "view\login.html":
        + 3 hidden modules
Child html-webpack-plugin for "view\index.html":
        + 4 hidden modules

    ERROR in Cannot find module 'clean-css'
     @ ./~/html-webpack-plugin/lib/loader.js!./src/view/index.html 4:10-56
Child extract-text-webpack-plugin:
        + 2 hidden modules