如何关闭所有websocket连接

Question

I'm trying to close all websocket connections. Unfortunately I get allways the error:

TypeError: s.close is not a function

I am using javascript rarely, and I can't find the error...

var sockets = [];

function addClient() {

    var socket = new WebSocket("ws://localhost:8080/WebsocketHome/notification");
    socket.onmessage = function (event){
        [...]
    };

    sockets.push(socket);
}


function removeAllClients(){
    for(var s in sockets){
        s.close();
    }
}

Answer 1

for gives you the keys (which are: array indices in this case), not the values; you need:

for(s in sockets)
    sockets[s].close();

Answer 2

incredible, but this code:

function removeAllClients(){
    for(var s in sockets){
        s.close();
    }
}

iterate over indexes. So I do it now in this way:

function removeAllClients(){

    sockets.forEach(function(s) {
        s.close();
    });

}

and it works. I'm really surprised...