js websocket send函数An attempt was made to use an object that is not, or is no longer, usable

这个错误通常是由于在websocket连接关闭之后仍然尝试发送消息导致的。因此，确保在发送消息之前检查websocket连接的状态，以便在关闭连接后不再发送消息。

以下是示例代码：

if (webSocket.readyState === WebSocket.OPEN) {
  webSocket.send(message);
} else {
  console.error('WebSocket is not open. Cannot send message.');
}

在这个示例中，我们检查了WebSocket的状态，只有当其状态为OPEN时才发送消息。如果状态不是OPEN，我们会打印一个错误消息，表明WebSocket未开启，不能发送消息。这样就可以避免上述错误的发生。

相关问题

WebSocket is not defined

This error message typically appears in the console of a web browser when attempting to use WebSocket functionality without first declaring or importing the WebSocket object.

To resolve this error, ensure that you have properly declared and initialized the WebSocket object in your code. This may include importing the required libraries or modules, as well as properly instantiating the WebSocket object with the appropriate parameters.

Additionally, ensure that your web browser supports WebSocket functionality and that you are using a compatible version of the browser. Some older browsers may not support WebSocket, or may require additional configuration or setup to enable this feature.

WebSocket is already in CLOSING or CLOSED state.

As an AI language model, I don't have enough context to provide a specific answer to this error message. However, this error message is commonly encountered when using WebSocket technology in web development. It usually indicates that the WebSocket connection is already closed, and any attempt to send or receive data through the connection will fail.

Possible reasons for this error message include:

- The server or client explicitly closed the WebSocket connection.
- The WebSocket connection timed out due to inactivity.
- A network error or other issue caused the WebSocket connection to be lost.

To resolve this error, you may need to investigate the cause of the closed WebSocket connection and implement appropriate error handling in your code.