标签: express

我一直试图找到一种在使用Node.js时写入文件的方法,但没有成功.我怎样才能做到这一点？

我们可以在Node.js中的查询字符串中获取变量,就像我们$_GET在PHP中获取它们一样吗？

我知道在Node.js中我们可以在请求中获取URL.有没有获取查询字符串参数的方法？

我使用以下命令安装了Express.js:

sudo npm install -g express

我收到以下警告:

npm WARN package.json range-parser@0.0.4 No repository field.
npm WARN package.json fresh@0.1.0 No repository field.
npm WARN package.json methods@0.0.1 No repository field.
npm WARN package.json methods@0.0.1 No readme data.
npm WARN package.json cookie-signature@1.0.1 No repository field.
npm WARN package.json send@0.1.0 No repository field.
npm WARN package.json pause@0.0.1 No repository field.
npm WARN package.json bytes@0.2.0 No repository field.
npm WARN package.json github-url-from-git@1.1.1 No repository field.
npm WARN package.json assert-plus@0.1.2 No repository field.
npm WARN package.json …

这是我的简单形式:

<form id="loginformA" action="userlogin" method="post">
    <div>
        <label for="email">Email: </label>
        <input type="text" id="email" name="email"></input>
    </div>
<input type="submit" value="Submit"></input>
</form>

这是我的Express.js /Node.js代码:

app.post('/userlogin', function(sReq, sRes){    
    var email = sReq.query.email.;   
}

我试过sReq.query.email或sReq.query['email']或sReq.params['email']等他们都没有工作.他们都回来了undefined.

当我改为Get电话时,它有效,所以..任何想法？

我是Node.js的新手,我遇到了一些问题.

我使用的是Node.js 4.10和Express 2.4.3.

当我尝试访问http://127.0.0.1:8888/auth/facebook时,我将被重定向到http://127.0.0.1:8888/auth/facebook_callback.

然后我收到以下错误:

Error: Can't render headers after they are sent to the client.
    at ServerResponse.<anonymous> (http.js:573:11)
    at ServerResponse._renderHeaders (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/patch.js:64:25)
    at ServerResponse.writeHead (http.js:813:20)
    at /home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect-auth/lib/auth.strategies/facebook.js:28:15
    at /home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect-auth/lib/index.js:113:13
    at next (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect-auth/lib/strategyExecutor.js:45:39)
    at [object Object].pass (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect-auth/lib/authExecutionScope.js:32:3)
    at [object Object].halt (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect-auth/lib/authExecutionScope.js:29:8)
    at [object Object].redirect (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect-auth/lib/authExecutionScope.js:16:8)
    at [object Object].<anonymous> (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect-auth/lib/auth.strategies/facebook.js:77:15)
Error: Can't set headers after they are sent.
    at ServerResponse.<anonymous> (http.js:527:11)
    at ServerResponse.setHeader (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/patch.js:50:20)
    at next (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:162:13)
    at next (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:195:11)
    at next (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:150:23)
    at param (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/middleware/router.js:189:13)
    at …

我试图在我的Node.js应用程序中支持使用Express.js Web框架的CORS.我已经阅读了有关如何处理此问题的Google小组讨论,并阅读了一些有关CORS如何工作的文章.首先,我这样做了(代码是用CoffeeScript语法编写的):

app.options "*", (req, res) ->
  res.header 'Access-Control-Allow-Origin', '*'
  res.header 'Access-Control-Allow-Credentials', true
  # try: 'POST, GET, PUT, DELETE, OPTIONS'
  res.header 'Access-Control-Allow-Methods', 'GET, OPTIONS'
  # try: 'X-Requested-With, X-HTTP-Method-Override, Content-Type, Accept'
  res.header 'Access-Control-Allow-Headers', 'Content-Type'
  # ...

它似乎不起作用.好像我的浏览器(Chrome)没有发送初始OPTIONS请求.当我刚刚更新资源块时,我需要将跨源GET请求提交到:

app.get "/somethingelse", (req, res) ->
  # ...
  res.header 'Access-Control-Allow-Origin', '*'
  res.header 'Access-Control-Allow-Credentials', true
  res.header 'Access-Control-Allow-Methods', 'POST, GET, PUT, DELETE, OPTIONS'
  res.header 'Access-Control-Allow-Headers', 'Content-Type'
  # ...

它有效(在Chrome中).这也适用于Safari.

我读过......

在实现CORS的浏览器中,每个跨源GET或POST请求前面都有一个OPTIONS请求,用于检查GET或POST是否正常.

所以我的主要问题是,为什么在我的案例中似乎没有发生这种情况？为什么我的app.options块没有被调用？为什么我需要在主app.get块中设置标题？

我正在使用NodeJS的ExpressJS Web框架.

使用ExpressJS的人将他们的环境(开发,生产,测试......),他们的路线等放在了app.js.我认为这不是一个很好的方式,因为当你有一个很大的应用程序时,app.js太大了!

我想有这个目录结构:

| my-application
| -- app.js
| -- config/
     | -- environment.js
     | -- routes.js

这是我的代码:

app.js

var express = require('express');
var app = module.exports = express.createServer();

require('./config/environment.js')(app, express);
require('./config/routes.js')(app);

app.listen(3000);

配置/ environment.js

module.exports = function(app, express){
    app.configure(function() {
    app.use(express.logger());
    });

    app.configure('development', function() {
    app.use(express.errorHandler({
        dumpExceptions: true,
        showStack: true
    }));
    });

    app.configure('production', function() {
    app.use(express.errorHandler());
    });
};

配置/ routes.js

module.exports = function(app) {
    app.get('/', function(req, res) {
    res.send('Hello world !');
    });
};

我的代码运行良好,我认为目录的结构很漂亮.但是,代码必须进行调整,我不确定它是好还是漂亮.

使用我的目录结构并调整代码或只使用一个文件(app.js)更好吗？

谢谢你的建议!

我知道如何获得这样的查询的参数:

app.get('/sample/:id', routes.sample);

在这种情况下,我可以req.params.id用来获取参数(例如2in /sample/2).

但是,对于url来说/sample/2?color=red,如何访问变量color？

我试过req.params.color但它没用.

假设我的样本网址是

http://example.com/one/two

我说我有以下路线

app.get('/one/two', function (req, res) {
    var url = req.url;
}

价值url将是/one/two.

如何在Express中获取完整的URL？例如,在上面的情况下,我想收到http://example.com/one/two.

我收到以下错误快递:

Error: request entity too large
    at module.exports (/Users/michaeljames/Documents/Projects/Proj/mean/node_modules/express/node_modules/connect/node_modules/raw-body/index.js:16:15)
    at json (/Users/michaeljames/Documents/Projects/Proj/mean/node_modules/express/node_modules/connect/lib/middleware/json.js:60:5)
    at Object.bodyParser [as handle] (/Users/michaeljames/Documents/Projects/Proj/mean/node_modules/express/node_modules/connect/lib/middleware/bodyParser.js:53:5)
    at next (/Users/michaeljames/Documents/Projects/Proj/mean/node_modules/express/node_modules/connect/lib/proto.js:193:15)
    at Object.cookieParser [as handle] (/Users/michaeljames/Documents/Projects/Proj/mean/node_modules/express/node_modules/connect/lib/middleware/cookieParser.js:60:5)
    at next (/Users/michaeljames/Documents/Projects/Proj/mean/node_modules/express/node_modules/connect/lib/proto.js:193:15)
    at Object.logger (/Users/michaeljames/Documents/Projects/Proj/mean/node_modules/express/node_modules/connect/lib/middleware/logger.js:158:5)
    at next (/Users/michaeljames/Documents/Projects/Proj/mean/node_modules/express/node_modules/connect/lib/proto.js:193:15)
    at Object.staticMiddleware [as handle] (/Users/michaeljames/Documents/Projects/Proj/mean/node_modules/express/node_modules/connect/lib/middleware/static.js:55:61)
    at next (/Users/michaeljames/Documents/Projects/Proj/mean/node_modules/express/node_modules/connect/lib/proto.js:193:15)
TypeError: /Users/michaeljames/Documents/Projects/Proj/mean/app/views/includes/foot.jade:31
    29| script(type="text/javascript", src="/js/socketio/connect.js")
    30| 
  > 31| if (req.host='localhost')
    32|     //Livereload script rendered 
    33|     script(type='text/javascript', src='http://localhost:35729/livereload.js')  
    34| 

Cannot set property 'host' of undefined
    at eval (eval at <anonymous> (/Users/michaeljames/Documents/Projects/Proj/mean/node_modules/jade/lib/jade.js:152:8), <anonymous>:273:15)
    at /Users/michaeljames/Documents/Projects/Proj/mean/node_modules/jade/lib/jade.js:153:35
    at Object.exports.render (/Users/michaeljames/Documents/Projects/Proj/mean/node_modules/jade/lib/jade.js:197:10)
    at Object.exports.renderFile …