如何获取javascript websocket连接的当前状态

Question

有时当我重新启动服务器或网络出现故障时,websocket会关闭,我希望能够始终获得当前的连接状态.

我基本上得到以下错误,我希望能够预测它:

WebSocket is already in CLOSING or CLOSED state. 
    (anonymous function) 
    InjectedScript._evaluateOn 
    InjectedScript._evaluateAndWrap 
    InjectedScript.evaluate

Answer 1

这非常简单:readyStatewebsocket 的属性始终包含websocket的连接,如WebSocket API中指定的那样

它将是以下值之一:CONNECTING OPEN CLOSING或CLOSED

解决错误的方法是这样的:

if (yourWsObject.readyState === WebSocket.CLOSED) {
   // Do your stuff...
}