build处理背景图路径

资源里面的背景图片，不像index.html中加载资源一样，通过./static/js/app.js引用可以正常加载，图片资源是通过css加载的，如 background: url("../../assets/images/logo-index.png") no-repeat;被相对打包后变成了url(static/img/logo-index.2f00bf2.png) no-repeat所以我们要保留css引用图片的正常路径，即：url(../../static/img/logo-index.2f00bf2.png)no-repeat那么就需要修改build文件夹下的utils.js代码

---

// generate loader string to be used with extract text plugin

  function generateLoaders (loader, loaderOptions) {

    const loaders = options.usePostCSS ? [cssLoader, postcssLoader] : [cssLoader]

    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,

//      publicPath: 'https://sign-web.oss-cn-hangzhou.aliyuncs.com/',

        publicPath: '../../',

        fallback: 'vue-style-loader'

      })

    } else {

      return ['vue-style-loader'].concat(loaders)

    }

  }