支持 cssnano

 'use strict';
 const css = require('../css');
+const co = require('bluebird').coroutine;
 
-const detail = (req, res) => {
-    res.render('guang/detail', {
-        css: css('guang/detail.css'),
-        msg: 'xxxxxxx'
-    });
+const detail = (req, res, next) => {
+    co(function* () {
+        return res.render('guang/detail', {
+            css: yield css('guang/detail.css'),
+            msg: 'xxxxxxx'
+        });
+    })().catch(next);
 };
 
 module.exports = {

 const fs = require('fs');
 const path = require('path');
+const cssnano = require('cssnano');
 
+const logger = global.yoho.logger;
 const css = {};
 
 module.exports = (file) => {
-    if (css[file]) {
-        return css[file];
+    const isDev = process.env.NODE_ENV === 'production' || process.env.NODE_ENV === 'test';
+
+    if (css[file] && !isDev) {
+        return Promise.resolve(css[file]);
     }
 
     const cssPath = path.join(__dirname, 'css', file);
     const cssfile = fs.readFileSync(cssPath).toString();
 
-    css[file] = cssfile;
-
-    return css[file];
+    return cssnano.process(cssfile, {
+        safe: true,
+        autoprefixer: {
+            add: true,
+            browsers: ['> 1%', 'android >=4', 'ios >=8']
+        }
+    }).then(function(result) {
+        if (result && result.css) {
+            css[file] = result.css;
+            return css[file];
+        }
+        return '';
+    }).catch(err => {
+        logger.error(err);
+        return '';
+    });
 };

 body {
+    display: flex;
 
+    a {
+        display: none;
+    }
 }

@@ -26,6 +26,7 @@
     "body-parser": "^1.16.1",
     "captchapng": "0.0.1",
     "cheerio": "^0.22.0",
+    "cssnano": "^3.10.0",
     "client-sessions": "^0.8.0",
     "compression": "^1.6.2",
     "connect-memcached": "^0.2.0",
@@ -62,7 +63,6 @@
     "babel-polyfill": "^6.23.0",
     "babel-preset-env": "^1.4.0",
     "css-loader": "^0.28.1",
-    "cssnano": "^3.10.0",
     "eslint": "^3.19.0",
     "eslint-config-yoho": "^1.0.1",
     "eslint-loader": "^1.7.1",