Node.js Expressjs+；猫鼬-此网页不可用？

为什么猫鼬会破坏expressjs网站

下面是我的代码：

var express = require('express');
var mongoose = require('mongoose');
var app = express();

// Connect to mongodb
mongoose.connect("mongodb://localhost/testdb", function(err) {
    if (err) throw err;
    console.log("Successfully connected to mongodb");

    // Start the application after the database connection is ready
    app.listen(3000);
    console.log("Listening on port 3000");
});

// With Mongoose, everything is derived from a Schema. Let's get a reference to it and define our users.
var userSchema = mongoose.Schema({
    name: String,
    username: { type: String, required: true, unique: true },
    password: { type: String, required: true },
    admin: Boolean,
    location: String,
    meta: {
      age: Number,
      website: String
    },
    created_at: Date,
    updated_at: Date
});

// The next step is compiling our schema into a Model.
var User = mongoose.model('User', userSchema);

// Set route.
app.get("/", function(req, res) {

  //  We can access all of the user documents through our User model.
  User.find(function (err, users) {
    if (err) return console.error(err);
    console.log(users);
  })
});

我在浏览器上看到：

This webpage is not available

但在我的终端，我得到的结果是：

Successfully connected to mongodb
Listening on port 3000

[ { _id: 57682f69feaf405c51fdf144,
    username: 'testuser1',
    email: 'testuser1@testdomain.com' },
  { _id: 57683009feaf405c51fdf145,
    username: 'testuser2',
    email: 'testuser2@testdomain.com' },
  { _id: 57683009feaf405c51fdf146,
    username: 'testuser3',
    email: 'testuser3@testdomain.com' }]

---

您知道我遗漏了什么吗？

问题是您没有在请求处理程序的响应对象中写入任何内容。因此，浏览器会一直等待请求完成，并以超时结束。在app.get（）中，您可以如下方式更新响应：

// Set route.
app.get("/", function(req, res) {

  //  We can access all of the user documents through our User model.
  User.find(function (err, users) {
    if (err) {
        console.error(err);
        // some simple error handling, maybe form a proper error object for response.
        res.status(500).json(err);
    }
    console.log(users);
    res.status(200).json(users);  // setting the object as json response

    //OR

    // res.end();   if you don't want to send anything to the client
  })
});

或者类似的东西

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有关更多详细信息，请参阅Express文档：

很高兴能为您提供帮助！：）当发生错误时，也应该发送响应。是的，我同意罗伯特的观点。编辑。