Question

我正在尝试使用node.js，html和js创建注册页面。我的登录命令有效，但我尝试复制和修改相同的代码，但无法注册。它在浏览器中显示“类型错误”。服务器工作正常。我尝试使用curl发送命令，它也可以正常工作。

curl -XPOST -H 'Content_Type: application/json' --data '{"username":"rkmenon235","password":"rkm235"}' http://eorlundgraymane.imad.hasura-app.io/create-user

我使用网页发布时收到的错误是

TypeError: Not a buffer
   at TypeError (native)
   at pbkdf2 (crypto.js:562:20)
   at Object.exports.pbkdf2Sync (crypto.js:553:10)
   at hash (/home/rkm/Desktop/webapp/imad-2016-app/server.js:22:22)
   at /home/rkm/Desktop/webapp/imad-2016-app/server.js:62:17
   at Layer.handle [as handle_request] (/home/rkm/Desktop/webapp/imad-2016-app/node_modules/express/lib/router/layer.js:95:5)
   at next (/home/rkm/Desktop/webapp/imad-2016-app/node_modules/express/lib/router/route.js:131:13)
   at Route.dispatch (/home/rkm/Desktop/webapp/imad-2016-app/node_modules/express/lib/router/route.js:112:3)
   at Layer.handle [as handle_request] (/home/rkm/Desktop/webapp/imad-2016-app/node_modules/express/lib/router/layer.js:95:5)
   at /home/rkm/Desktop/webapp/imad-2016-app/node_modules/express/lib/router/index.js:277:22

这是我用于注册命令的Javascript代码（main.js）。

var regy = document.getElementById('signupbutton');
regy.onclick = function(){
    var request = new XMLHttpRequest();
    request.onreadystatechange = function(){
        if(request.readyState === XMLHttpRequest.DONE){
            if(request.status === 200)
                {
                    console.log("user created");
                    alert("Creates Account successfully");      
                }
            else if(request.status === 403){
                alert('Something is 404');
            }
            else if(request.status === 500){
                alert('Something is wrong on the server 500');
            }
        }
    };
var username = document.getElementById('username').value;
var password = document.getElementById('password').value;
console.log(username);
console.log(password);
request.open('POST','http://localhost:8080/create-user',true);
request.setRequestHeader('Content-Type', 'application/json');
request.send(JSON.stringify({username:username,password:password}));
};

这是我的服务器代码（server.js），它响应POST请求

我的服务器代码顶部有

var express = require('express');
var morgan = require('morgan');
var path = require('path');
var Pool = require('pg').Pool;//Postgres connetion pool
var crypto = require('crypto');
var bodyParser = require('body-parser');

var app = express();
app.use(morgan('combined'));
app.use(bodyParser.json());

然后我有这个特定的请求处理程序（也是server.js的一部分）

app.post('/create-user',function(req,res){

    var username = req.body.username;
    var password = req.body.password;
    var salt = crypto.randomBytes(128).toString('hex');
    var dbString = hash(password,salt);
    pool.query('INSERT INTO users (username,passwordhash) VALUES ($1,$2)',[username,dbString],function(err,result){
            if(err){
            res.status(500).send(err.toString());
        }
        else
            {
                    res.send('User Successfully created !'+username);
            }
    });
});

这是HTML代码

<html>
    <link href = "/loginstyle.css" rel="stylesheet">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
    <script type = "text/javascript" src = "/scripts/coderider"></script>
    <body id = "bodyback">
        <div id = "container">
        <div id = "loginpane">
            <form action = "/create-user" method = "POST">
            <input type = "text" name = "username" id = "username" placeholder = "Username"/><br>
            <input type = "password" name = "password" id = "password" placeholder = "Password"/>
            <br>
            <input type = "submit"  id = "signupbutton" name = "signupbutton" value = "Sign Up"/>
            <br>
            </form>
        </div>
        </div>
    </body>
</html>
    <script type = "text/javascript" src = "/main.js"></script>

我在终端使用CURL时重复代码工作正常但我无法使用javascript从html页面使用POST调用注册。

感谢您提供的任何帮助。

Answer 1

我认为您遇到跨域请求问题。尝试将标头添加到Node.js

res.header("Access-Control-Allow-Origin", "*");
res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept, Authorization");

Answer 2

问题在于我已将登录和提交页面的脚本链接指定给同一文件。文本元素是在同一个脚本中创建的，但是有两个不同的文件。这不是一个保证的任务，因为元素不能使用document.getElementbyId（）;

进行调用。

所以我为每个页面创建了一个单独的脚本并调用了document元素。这次我测试使用console.lo进行调试，它就像一个魅力

JS中的POST请求没有正确读取JSON字符串值

2 个答案: