18

它是服务器端 Javascript(犀牛引擎),因此 setTimeout 不可用。如何异步运行函数?

4

3 回答 3

41

您可以使用java.util.Timerjava.util.TimerTask滚动您自己的设置/清除超时和设置/清除间隔功能:

var setTimeout,
    clearTimeout,
    setInterval,
    clearInterval;

(function () {
    var timer = new java.util.Timer();
    var counter = 1; 
    var ids = {};

    setTimeout = function (fn,delay) {
        var id = counter++;
        ids[id] = new JavaAdapter(java.util.TimerTask,{run: fn});
        timer.schedule(ids[id],delay);
        return id;
    }

    clearTimeout = function (id) {
        ids[id].cancel();
        timer.purge();
        delete ids[id];
    }

    setInterval = function (fn,delay) {
        var id = counter++; 
        ids[id] = new JavaAdapter(java.util.TimerTask,{run: fn});
        timer.schedule(ids[id],delay,delay);
        return id;
    }

    clearInterval = clearTimeout;

})()
于 2011-04-24T00:32:53.917 回答
5

查看Rhino 示例页面Multithreaded Script Execution上的示例。基本上,JavaScript 不直接支持线程,但您可以使用 Java 线程来实现您正在寻找的东西。

于 2010-02-14T16:42:48.570 回答
3

另一个使用ScheduledThreadPoolExecutor的版本,与 Rhino 1.7R4 兼容,由@Nikita-Beloglazov提出:

var setTimeout, clearTimeout, setInterval, clearInterval;

(function () {
    var executor = new java.util.concurrent.Executors.newScheduledThreadPool(1);
    var counter = 1;
    var ids = {};

    setTimeout = function (fn,delay) {
        var id = counter++;
        var runnable = new JavaAdapter(java.lang.Runnable, {run: fn});
        ids[id] = executor.schedule(runnable, delay, 
            java.util.concurrent.TimeUnit.MILLISECONDS);
        return id;
    }

    clearTimeout = function (id) {
        ids[id].cancel(false);
        executor.purge();
        delete ids[id];
    }

    setInterval = function (fn,delay) {
        var id = counter++;
        var runnable = new JavaAdapter(java.lang.Runnable, {run: fn});
        ids[id] = executor.scheduleAtFixedRate(runnable, delay, delay, 
            java.util.concurrent.TimeUnit.MILLISECONDS);
        return id;
    }

    clearInterval = clearTimeout;

})()

参考:https ://gist.github.com/nbeloglazov/9633318

于 2014-03-19T08:17:27.310 回答