If e.RowIndex < 0 AndAlso e.ColumnIndex < 0 Then
e.Graphics.FillRectangle(Brushes.Transparent, e.CellBounds)
e.Handled = True
End If
我收到错误（尝试运行服务器时）var express = require('express');
var app = express();
var middleware = {
requireAuthentication: function(req, res, next){
console.log("private route hit");
next();
}
};
app.use(middleware.requireAuthentication());
app.get('/about',
function(req, res){
res.send('You clicked on about!');
}
);
var projectDir = __dirname + '/public';
app.use(express.static(projectDir));
app.listen(3000), function(){
console.log('Static service started');
};
不是函数。我一直在关注Nodejs的教程，它对他们来说效果很好。我在这里遇到的问题是什么？
答案 0 :(得分：8)
这一行：
Auto 调用您的方法，并将其返回值传递给double.NaN。你没有用任何参数调用它，所以<!--
Lincense: Public Domain
-->
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Sample of web_socket.js</title>
<script src="js/websocket.js"></script>
<!-- Include these three JS files: -->
<script type="text/javascript">
function WebSocketTest()
{
if ("WebSocket" in window)
{
alert("WebSocket is supported by your Browser!");
// Let us open a web socket
var ws = new WebSocket("ws://localhost:9777");
ws.onopen = function()
{
// Web Socket is connected, send data using send()
ws.send("message");
alert("Message is sent...");
};
ws.onmessage = function (evt)
{
alert("Message is received...");
};
ws.onclose = function()
{
// websocket is closed.
alert("Connection is closed...");
};
}
else
{
// The browser doesn't support WebSocket
alert("WebSocket NOT supported by your Browser!");
}
}
</script>
</head>
<body>
<div id="sse">
<a href="javascript:WebSocketTest()">Run WebSocket</a>
</div>
</body></html>参数自然是app.use(middleware.requireAuthentication());
摆脱app.use所以你将函数而不是结果传递给next：
undefined.