视频请戳: http://www.tudou.com/programs/view/6Lo4HXWXh9M/?phd=3 里边涉及的代码在这里: https://gitcafe.com/jiyinyiyong/less-sourcemap
Google 开发者文档里关于 CSS SoureMap 的描述看这里: https://developers.google.com/chrome-developer-tools/docs/css-preprocessors 关于 LESS SourceMap 的话, 网上随便搜就是了