vue打包elementUI的时候，小图标变成小方框

在vue的build文件夹找到utils.js文件，然后在下面这个位置添加

publicPath: '../../'

function generateLoaders (loader, loaderOptions) {
    const loaders = options.usePostCSS ? [cssLoader, postcssLoader] : [cssLoader,px2remLoader]

    if (loader) {
      loaders.push({
        loader: loader + '-loader',
        options: Object.assign({}, loaderOptions, {
          sourceMap: options.sourceMap
        })
      })
    }

    // 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: '../../'
      })
    } else {
      return ['vue-style-loader'].concat(loaders)
    }
  }