vue项目启动执行时报错找不到图片，error in ./src/assets/images/logo.png 解决： 先卸载再重新安装image-webpack-loader
npm uninstall image-webpack-loader
cnpm install image-webpack-loader --save-dev
更新： 如果安装image-webpack-loader依然报错pngquant failed to build, make sure that libpng-dev is installed 那就需要安装imagemin-pngquant
cnpm install imagemin-pngquant --save-dev
安装成功，再安装 image-webpack-loader
cnpm install image-webpack-loader --save-dev
