feat(server.js): applyMiddleware API升级，现在允许用户调用多次绑定多个Middleware，它们将会按照绑定顺序依次执行。

Author: Ellery0924

lib/commands/server.js

@@ -1,6 +1,13 @@
 'use strict';
 
-function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
+function _defineProperty(obj, key, value) {
+    if (key in obj) {
+        Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true });
+    } else {
+        obj[key] = value;
+    }
+    return obj;
+}
 
 var connect = require('connect'),
     fs = require('fs'),
@@ -130,13 +137,17 @@ exports.run = function (options) {
         try {
             var projectInfo = getProjectInfo(req);
             var project = Manager.getProject(projectInfo.projectCwd, { cache: false });
-            var customMiddleware = project.config.getMiddleware();
+            var customMiddlewares = project.config.getMiddlewares();
+            var _next = () => {
+                if (customMiddlewares.length === 0) {
+                    next();
+                } else {
+                    const nextMw = customMiddlewares.shift();
+                    nextMw(req, res, _next);
+                }
+            };
 
-            if (typeof customMiddleware === 'function') {
-                customMiddleware(req, res, next);
-            } else {
-                next();
-            }
+            _next();
         } catch (e) {
             next();
         }

lib/models/Config.js

@@ -76,7 +76,7 @@ var Config = function () {
             },
             requireRules: [],
             devtool: 'cheap-source-map',
-            middleware: null
+            middleware: []
         };
     }
 
@@ -187,12 +187,12 @@ var Config = function () {
         key: 'applyMiddleware',
         value: function applyMiddleware(mw) {
             if (typeof mw === 'function') {
-                this._config.middleware = mw;
+                this._config.middleware.push(mw);
             }
         }
     }, {
-        key: 'getMiddleware',
-        value: function getMiddleware() {
+        key: 'getMiddlewares',
+        value: function getMiddlewares() {
             return this._config.middleware;
         }
     }, {

src/models/Config.js

@@ -72,7 +72,7 @@ class Config {
             },
             requireRules: [],
             devtool: 'cheap-source-map',
-            middleware: null
+            middleware: []
         };
     }
 
@@ -169,11 +169,11 @@ class Config {
 
     applyMiddleware(mw) {
         if (typeof mw === 'function') {
-            this._config.middleware = mw;
+            this._config.middleware.push(mw);
         }
     }
 
-    getMiddleware() {
+    getMiddlewares() {
         return this._config.middleware;
     }