• 用js写的WebSocketHeartBeat，心跳检测
• 代码

<script>

    var ws;//websocket实例
    var lockReconnect = false;//避免重复连接
    var wsUrl = 'ws://localhost:8811';

    function createWebSocket(url) {
        try {
            ws = new WebSocket(url);
            initEventHandle();
        } catch (e) {
            reconnect(url);
        }
    }

    function initEventHandle() {
        //连接关闭 - 重连
        ws.onclose = function (event) {
            console.log('onclose：' + event.data)
            reconnect(wsUrl);
        };
        //连接异常 - 重连
        ws.onerror = function (event) {
            console.log('onerror：' + event.data);
            reconnect(wsUrl);
        };
        //连接成功 - 发送心跳消息
        ws.onopen = function () {
            //保持连接：每60秒发送一个消息
            setInterval(function () {
                ws.send('{"user_id": 0,"cmd_type":0,"content":"HeartBeat Message"}');
            }, 60000);
        };
        ws.onmessage = function(event){
            try {
                let obj = JSON.parse(event.data);
                if (typeof obj == 'object' && obj) {
                    //处理服务端返回的数据对象 obj：弹出消息框，内容支持点击...
                }
            } catch (e) {
                console.log('catch - error event：' + event.data + ' parse json error !!!' + e);
            }

        }.bind(this);
    }

    //重连操作
    function reconnect(url) {
        if(lockReconnect){
            return;
        }
        lockReconnect = true;
        //没连接上会一直重连，设置延迟避免请求过多
        setTimeout(function () {
            createWebSocket(url);
            lockReconnect = false;
        }, 10000); //10秒后重连
    }


    //调用websocket
    createWebSocket(wsUrl);

</script>