HTML 5 ShareWorker

ShareWorker和Worker区别

worker:专属线程,只针对当前运行环境(HTML 5 Web Workers

sharedWorker:共享线程,同源策略下,多个运行环境共用同一个线程,包括数据。

方法

  • start:开启连接
  • connect:连接
  • postMessage:发送数据
  • onmessage:接收数据

页面通信举例

页面

<body>
    <input type="text" id="input">
    <button id="submit">提交</button>
    <p id="news"></p>
</body>
<script>
    let work = new SharedWorker('work.js');
    let port = work.port;
    //开启
    port.start();
    //通知所有人
    port.postMessage({ type: "start" });
    //点击触发事件
    submit.onclick = function (e) {
        port.postMessage({
            type: "msg",
            value: input.value
        });
        input.value = "";
    }
    //接收数据
    port.onmessage = function (e) {
        console.log(e.data)
        if (Array.isArray(e.data)) {
            let html = "";
            e.data.forEach(msg => {
                html += `<p>${msg}</p>`;
            });
            news.innerHTML = html;
        } else {
            news.innerHTML = e.data;
        }
    }
</script>

work.js

let connectList = [], msgList = [];
self.onconnect = function (w) {
    // 开启
    let port = w.ports[0];
    port.start();
    // 监听
    port.onmessage = function (e) {
        let worker = e.currentTarget, data = e.data;
        // 加入到列表
        if (connectList.indexOf(worker) === -1) {
            connectList.push(worker);
        }
        //新用户进入 
        if (data.type === "start") {
            connectList.forEach(item => {
                if (item === worker)
                    item.postMessage("你已进入");
                else
                    item.postMessage("新用户进入");
            })
        }
        //新消息
        if (data.type === "msg") {
            msgList.push(data.value);
            connectList.forEach(item => {
                item.postMessage(msgList);
            })
        }
    }
}

posted @ 2020-06-23 23:13  aeipyuan  阅读(377)  评论(0编辑  收藏  举报