小编Kie*_*606的帖子

在我的模态中我试图将Datatables放在那里,我遇到的问题是宽度不正确,它应该是模态的宽度,但它实际上是这样的

我的jQuery调用Datatables

function getValidTags(){
      var ruleID = $('.ruleID').val();

      var table = $('.valid-tags').DataTable({
      "ajax": {
          "url": "/ajax/getValidTags.php",
          "type": "POST",
          "data": {
            ruleID: ruleID
          },
      },
      "columnDefs": [{
         "targets": 2,
         "render": function(data, type, full, meta){
            return '<button class="btn btn-default btn-sm" type="button">Manage</button> <button class="btn btn-danger btn-sm">Delete</button>';
         }
      }]        
  });   
}

我的HTML

<!-- Modal where you will be able to add new rule -->
<div class="modal fade validation-list-modal" tabindex="-1" role="dialog" aria-labelledby="LargeModalLabel" aria-hidden="true" data-keyboard="false" data-backdrop="static">

    <div class="modal-dialog modal-wide">

        <div class="modal-content">

            <div class="modal-header modal-header-custom">
            <input class="ruleID" …

我试图在我的socket.io js(index.js)文件中使用jQuery.

每当我尝试做的时候

<script src="http://code.jquery.com/jquery-1.9.1.min.js"></script>
<script src="/socket.io/socket.io.js"></script> 
<script src="index.js"></script>
<script>
  var socket = io();
  $('form').submit(function(){
    socket.emit('chat message', $('#m').val());
    $('#m').val('');
    return false;
  });
  socket.on('chat message', function(msg){
    $('#messages').append($('<li>').text(msg));
  });
  socket.on('new user', function(data){
    $('#newUserMessage').text(data);
  });        
</script> 

我在控制台中收到此错误

GET http://localhost:3000/index.js 

ReferenceError: $ is not defined

我不确定为什么会这样？

但是如果我删除它,我不能在index.js中使用jQuery的函数？

我的index.js文件

var app = require('express')();
var http = require('http').Server(app);
var io = require('socket.io')(http);

var $usernameInput = $('.usernameInput');

app.get('/', function(req, res){
  res.sendFile(__dirname + '/index.html');
});

io.on('connection', function(socket){
  socket.broadcast.emit('new user', 'New User Joined, Say Hi :D');
  socket.on('chat message', function(msg){ …