试图创建一个信号R聊天应用程序，但给出一个错误，说$未定义 [英] Trying to create a signal R chat application but gives an error saying $ is undefined
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问题描述
<!DOCTYPE html>
<html>
<head>
<title>SignalR Simple Chat</title>
<style type="text/css">
.container {
background-color: #99CCFF;
border: thick solid #808080;
padding: 20px;
margin: 20px;
}
</style>
</head>
<body>
<div class="container">
<input type="text" id="message" />
<input type="button" id="sendmessage" value="Send" />
<input type="hidden" id="displayname" />
<ul id="discussion"></ul>
</div>
<!--Script references. -->
<!--Reference the jQuery library. -->
<script src="Scripts/jquery-3.1.1.min.js"></script>
<!--Reference the SignalR library. -->
<script src="Scripts/jquery.signalR-2.2.1.min.js"></script>
<!--Reference the autogenerated SignalR hub script. -->
<script src="signalr/hubs"></script>
<!--Add script to update the page and send messages.-->
<script type="text/javascript">
$(function () {
// Declare a proxy to reference the hub.
var chat = $.connection.chatHub;
// Create a function that the hub can call to broadcast messages.
chat.client.broadcastMessage = function (name, message) {
// Html encode display name and message.
var encodedName = $('<div />').text(name).html();
var encodedMsg = $('<div />').text(message).html();
// Add the message to the page.
$('#discussion').append('<li><strong>' + encodedName
+ '</strong>: ' + encodedMsg + '</li>');
};
// Get the user name and store it to prepend to messages.
$('#displayname').val(prompt('Enter your name:', ''));
// Set initial focus to message input box.
$('#message').focus();
// Start the connection.
$.connection.hub.start().done(function () {
$('#sendmessage').click(function () {
// Call the Send method on the hub.
chat.server.send($('#displayname').val(), $('#message').val());
// Clear text box and reset focus for next comment.
$('#message').val('').focus();
});
});
});
</script>
</body>
</html>
我尝试了什么：
我不知道我在哪里定义它，但j查询之一被引用为jquery.signalR-2.2.1.min .js当文件是jquery.signalR-2.2.2.min.js我试图改变它，但它然后说没有找到jQuery。请确保在SignalR客户端JavaScript文件之前引用jQuery。
What I have tried:
I'm not sure where I have to define it but one of the j query is referenced as jquery.signalR-2.2.1.min.js when the file is jquery.signalR-2.2.2.min.js I've tried to change it but it then says jQuery was not found. Please ensure jQuery is referenced before the SignalR client JavaScript file.
推荐答案
（ function （）{
// 声明代理以引用集线器。
var chat =
(function () { // Declare a proxy to reference the hub. var chat =
.connection.chatHub;
// 创建集线器可以调用广播消息的函数。
chat.client.broadcastMessage = function （名称，消息）{
// Html编码显示名称和消息。
< span class =code-keyword> var encodedName =
.connection.chatHub; // Create a function that the hub can call to broadcast messages. chat.client.broadcastMessage = function (name, message) { // Html encode display name and message. var encodedName =
（' < div />').text(nam E）的.html（）;
var encodedMsg =
('<div />').text(name).html(); var encodedMsg =
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