[{"_1":2,"_3":-5,"_4":-5},"loaderData",{"_5":6,"_7":8},"actionData","errors","root",{"_11":-5},"routes/user.$name.topics",{"_9":10,"_11":12,"_13":14,"_15":16,"_17":18,"_19":16},"topics",[35],"user",{"_20":21,"_13":14,"_22":23,"_24":25,"_26":27,"_28":29,"_30":16,"_31":32,"_33":34},"loginname","mozatt","page",1,"limit",20,"total","id","3328","avatar_url","http://www.gravatar.com/avatar/c279b4285c09f18d955202e7ba6ac4b0?size=48","githubUsername","","create_at","2012-04-06 06:52:13.289","score",35,"topic_count","reply_count",6,"is_star",false,{"_20":36,"_37":21,"_38":-5,"_39":40,"_41":42,"_43":44,"_45":34,"_46":34,"_31":47,"_48":49,"_26":50,"_51":52},"1461","author_id","tab","content","我是新手。最近下载了Mixus Node Book这篇pdf文档。试着执行文档内的例程。在试验Simple Messaging application一节的例子时，遇到了问题。发出来请高手帮看看。\r\n这是一个简单的消息推送服务器。发布消息使用：http://192.168.77.159:7778/msg/这里是消息内容。页面获取消息采用jQuery的long polling方式。在一台CentOS虚拟机下测试，用这台虚拟机的FireFox访问。\r\n\r\n服务端代码：\r\nvar http = require('http'),\r\n url = require('url'),\r\n fs = require('fs');\r\nvar messages = [\"testing\"];\r\nvar clients = [];\r\n\r\nhttp.createServer(function(req, res)\r\n {\r\n var url_parts = url.parse(req.url);\r\n console.log(url_parts);\r\n if ( url_parts.pathname.substr(0, 5) == '/poll' )\r\n {\r\n console.log('request /poll');\r\n var count = url_parts.pathname.replace(/[^0-9]*/, '');\r\n console.log(count);\r\n if ( messages.length > count )\r\n {\r\n console.log('send response');\r\n res.end(JSON.stringify({\r\n count:messages.length,\r\n append:messages.slice(count).join(\"\\n\")+\"\\n\"\r\n }));\r\n }\r\n else\r\n {\r\n console.log('appending the client');\r\n clients.push(res);\r\n }\r\n }\r\n else if ( url_parts.pathname.substr(0, 5) == '/msg/' )\r\n {\r\n console.log('request /msg/');\r\n var msg = unescape(url_parts.pathname.substr(5));\r\n console.log(msg);\r\n messages.push(msg);\r\n while ( clients.length > 0 )\r\n {\r\n var client = clients.pop();\r\n client.end(JSON.stringify({\r\n count:messages.length,\r\n append:msg+\"\\n\"}));\r\n }\r\n res.end();\r\n }\r\n }).listen(7778, '192.168.77.159');\r\nconsole.log('Server running.');\r\n\r\n客户端发送消息不需要编写代码，在浏览器的地址栏内直接输入url外加消息内容即可。\r\n这是消息获取页面客户端代码：\r\n\r\n\r\n\t\r\n\t\r\n\r\n\r\n\t\r\nw\r\n\r\n\r\n\r\n现在遇到的问题是，获取消息的页面始终无法显示出任何消息内容。但如果在浏览器的地址栏内直接输入这样的地址，就能看到json格式字串：http://192.168.77.159:7778/poll/0。\r\n\r\n我曾试着将客户端代码换成手写的ajax调用代码，不知为何req.status的值却是0。还望高手指点一二！","title","试验一篇教程上的例子，得不到应有的效果。","last_reply_at","2012-08-29 15:23:40.108","good","top",3,"visit_count",4522,"2012-08-29 07:45:10.068","author",{"_13":14,"_22":23}]