无法从Node.js提供的页面执行javascript函数

我正在编写一个Node.js应用程序，它正在呈现一个要显示的pug文件。在pug文件中，我尝试使用typeahead.js自动完成搜索字符串。外部javascript库（即typeahead）似乎加载良好，但在输入到搜索栏时不会被调用

我可能遗漏了一些与节点相关的内容。有什么能帮上忙的吗？下面是从电影数据库中提取查询的示例代码。执行是节点。/bin/www

views/index.pug

doctype html
html
   head
    script(src='../javascripts/jquery-3.2.1.min.js')
    script(src='../javascripts/typeahead.bundle.min.js')
    script(src='../javascripts/danielta.js')
    title= title
    link(rel='stylesheet', href='/stylesheets/style.css')
block content
    h1="Search"
        input(class="typeahead")

public/javascripts/danielta.js

   // Instantiate the Bloodhound suggestion engine
    var movies = new Bloodhound({
      datumTokenizer: function(datum) {
        return Bloodhound.tokenizers.whitespace(datum.value);
      },
      queryTokenizer: Bloodhound.tokenizers.whitespace,
      remote: {
        wildcard: '%QUERY',
        url: 'http://api.themoviedb.org/3/search/movie?query=%QUERY&api_key=f22e6ce68f5e5002e71c20bcba477e7d',
        transform: function(response) {
          // Map the remote source JSON array to a JavaScript object array
          return $.map(response.results, function(movie) {
            return {
              value: movie.original_title
            };
          });
        }
      }
    });

    movies.initialize();

    // Instantiate the Typeahead UI
    $('.typeahead').typeahead(null, {
      display: 'value',
      source: movies
    });

public/stylesheets/style.css

@font-face {
    font-family:"Prociono";
    src: url("../font/Prociono-Regular-webfont.ttf");
}
html {
    overflow-y: scroll;
}
.container {
    margin: 0 auto;
    max-width: 750px;
    text-align: center;
}
.tt-dropdown-menu, .gist {
    text-align: left;
}
html {
    color: #333333;
    font-family:"Helvetica Neue", Helvetica, Arial, sans-serif;
    font-size: 18px;
    line-height: 1.2;
}
.title, .example-name {
    font-family: Prociono;
}
p {
    margin: 0 0 10px;
}
.title {
    font-size: 64px;
    margin: 20px 0 0;
}
.example {
    padding: 30px 0;
}
.example-name {
    font-size: 32px;
    margin: 20px 0;
}
.demo {
    margin: 50px 0;
    position: relative;
}
.typeahead, .tt-query, .tt-hint {
    border: 2px solid #CCCCCC;
    border-radius: 8px 8px 8px 8px;
    font-size: 24px;
    height: 30px;
    line-height: 30px;
    outline: medium none;
    padding: 8px 12px;
    width: 396px;
}
.typeahead {
    background-color: #FFFFFF;
}
.typeahead:focus {
    border: 2px solid #0097CF;
}
.tt-query {
    box-shadow: 0 1px 1px rgba(0, 0, 0, 0.075) inset;
}
.tt-hint {
    color: #999999;
}
.tt-dropdown-menu {
    background-color: #FFFFFF;
    border: 1px solid rgba(0, 0, 0, 0.2);
    border-radius: 8px 8px 8px 8px;
    box-shadow: 0 5px 10px rgba(0, 0, 0, 0.2);
    margin-top: 12px;
    padding: 8px 0;
    width: 422px;
}
.tt-suggestion {
    font-size: 18px;
    line-height: 24px;
    padding: 3px 20px;
}
.tt-suggestion.tt-cursor {
    background-color: #0097CF;
    color: #FFFFFF;
}
.tt-suggestion p {
    margin: 0;
}
.gist {
    font-size: 14px;
}
.example-twitter-oss .tt-suggestion {
    padding: 8px 20px;
}
.example-twitter-oss .tt-suggestion + .tt-suggestion {
    border-top: 1px solid #CCCCCC;
}
.example-twitter-oss .repo-language {
    float: right;
    font-style: italic;
}
.example-twitter-oss .repo-name {
    font-weight: bold;
}
.example-twitter-oss .repo-description {
    font-size: 14px;
}
.example-sports .league-name {
    border-bottom: 1px solid #CCCCCC;
    margin: 0 20px 5px;
    padding: 3px 0;
}
.example-arabic .tt-dropdown-menu {
    text-align: right;
}

app.js

var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');

var index = require('./routes/index');
var users = require('./routes/users');

var app = express();

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'pug');

// uncomment after placing your favicon in /public
//app.use(favicon(path.join(__dirname, 'public', 'favicon.ico')));
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

app.use('/', index);
app.use('/users', users);

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  var err = new Error('Not Found');
  err.status = 404;
  next(err);
});

// error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

module.exports = app;

bin/www

#!/usr/bin/env node

/**
 * Module dependencies.
 */

var app = require('../app');
var debug = require('debug')('myapp:server');
var http = require('http');

/**
 * Get port from environment and store in Express.
 */

var port = normalizePort(process.env.PORT || '3000');
app.set('port', port);

/**
 * Create HTTP server.
 */

var server = http.createServer(app);

/**
 * Listen on provided port, on all network interfaces.
 */

server.listen(port);
server.on('error', onError);
server.on('listening', onListening);

/**
 * Normalize a port into a number, string, or false.
 */

function normalizePort(val) {
  var port = parseInt(val, 10);

  if (isNaN(port)) {
    // named pipe
    return val;
  }

  if (port >= 0) {
    // port number
    return port;
  }

  return false;
}

/**
 * Event listener for HTTP server "error" event.
 */

function onError(error) {
  if (error.syscall !== 'listen') {
    throw error;
  }

  var bind = typeof port === 'string'
    ? 'Pipe ' + port
    : 'Port ' + port;

  // handle specific listen errors with friendly messages
  switch (error.code) {
    case 'EACCES':
      console.error(bind + ' requires elevated privileges');
      process.exit(1);
      break;
    case 'EADDRINUSE':
      console.error(bind + ' is already in use');
      process.exit(1);
      break;
    default:
      throw error;
  }
}

/**
 * Event listener for HTTP server "listening" event.
 */

function onListening() {
  var addr = server.address();
  var bind = typeof addr === 'string'
    ? 'pipe ' + addr
    : 'port ' + addr.port;
  debug('Listening on ' + bind);
}

---

你确定这不是比赛条件吗？ 如果使用$document.ready怎么办

   $(function() {
       // Instantiate the Typeahead UI
       $('.typeahead').typeahead(null, {
          display: 'value',
          source: movies
       });
   });

---

如果没有看到相关代码粘贴到您的答案中，我们根本无法帮助您。此处有关代码的问题必须包括相关代码。我甚至无法从你的问题中判断问题是在网页中的Javascript中，还是在node.js服务器上的自动完成逻辑中。而且，一旦您知道是哪一个问题，我们将必须查看相关代码以提供解决方案。此外，请将您的问题的标题修改为更具体的问题。所有node.js编程都使用Javascript函数。您是否了解网页中的Javascript只能通过Ajax调用或webSocket连接与node.js服务器通信。不能直接从网页调用node.js服务器中的代码。node.js在您的服务器上运行。网页中的代码在浏览器中运行。他们在互联网的不同部分的不同电脑上。抱歉。我在问题中添加了代码并修改了标题。提前谢谢你的帮助，成功了！但不清楚为什么会这样。你能解释一下吗？哦，是的，对不起，你的javascript代码是在html页面呈现之前执行的。因此，当jquery选择器$'.typeahead'运行html标记时，找不到html标记，就没有要绑定到的typeahead类。使用jQueryDOM就绪包装器可以确保在运行js代码之前完全加载页面/html。