javascript - 如何在不使用 setTimeout 的情况下异步运行 javascript 函数？

Question

它是服务器端 Javascript(rhino 引擎)，因此 setTimeout 不可用。如何异步运行一个函数？

Answer 1

您可以使用 java.util.Timer和 java.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;

})()