support array callback

Makefile

@@ -42,7 +42,7 @@ test-travis: install
 test-all: install jshint test cov
 
 autod: install
-	@./node_modules/.bin/autod -w --prefix "~"
+	@./node_modules/.bin/autod -w --prefix "~" -e demo.js
 	@$(MAKE) install
 
 contributors: install

index.js

@@ -24,8 +24,7 @@ function jsonp(app, options) {
 
   Object.defineProperty(app.context, 'jsonp', {
     set: function (obj) {
-      var cb = this.query[callback];
-      if (typeof cb !== 'string' || cb === '') {
+      if (!this.query[callback]) {
         return this.body = obj;
       }
 

package.json

@@ -21,6 +21,7 @@
     "istanbul-harmony": "*",
     "jshint": "*",
     "koa": "~0.8.1",
+    "koa-qs": "~1.0.0",
     "mocha": "*",
     "should": "~4.0.4",
     "supertest": "~0.13.0"

test/index.test.js

@@ -16,6 +16,7 @@
 
 var should = require('should');
 var koa = require('koa');
+var qs = require('koa-qs');
 var request = require('supertest');
 var jsonp = require('../');
 
@@ -63,6 +64,22 @@ describe('index.test.js', function () {
     .expect(200, done);
   });
 
+  it('should send jsonp response with array callback', function (done) {
+    var app = koa();
+    qs(app);
+    jsonp(app);
+    app.use(function* () {
+      this.jsonp = {foo: 'bar'};
+    });
+
+    request(app.listen())
+    .get('/foo.json?callback=fn&callback=cb')
+    .expect('Content-Type', 'application/javascript')
+    .expect('X-Content-Type-Options', 'nosniff')
+    .expect('/**/ typeof fn === \'function\' && fn({"foo":"bar"});')
+    .expect(200, done);
+  });
+
   it('should send number response', function (done) {
     var app = koa();
     jsonp(app);