Question

我有以下代码：

return requestAsync({
     method: 'GET',
     url: 'https://' + servers[num - 1] + ':8033/version.txt'
}).then().catch()

我尝试在当时的处理程序中抛出一个错误但是没有用

如果在then处理程序中没有满足条件，我想抛出catch处理程序处理的错误。我该怎么做呢？

代码：

var P = require('bluebird');
var defer = function () {
    var resolve, reject;
    var promise = new P(function () {
        resolve = arguments[0];
        reject = arguments[1];
    });
    return {
        resolve: function () {
            resolve.apply(null, arguments);
            return promise;
        },
        reject: function () {
            reject.apply(null, arguments);
            return promise;
        },
        promise: promise
    };
};

var pool = {maxSockets: Infinity};
var requestAsync = function (options) {
    options.pool = pool;
    options.timeout = 60000;
    options.rejectUnauthorized = false;
    options.strictSSL = false;
    var deferred = defer();
    var r = request(options, function (err, res, body) {
        if (err) {
            return deferred.reject(err);
        }
        deferred.resolve(res, body);
    });

    deferred.promise.req = r;

    return deferred.promise;
};

return requestAsync({
     method: 'GET',
     url: 'https://' + servers[num - 1] + ':8033/version.txt'
}).then(function (response) {
     throw new Error('Server is not taken');
}).catch(function (err) { });

Answer 1

您可以手动throw错误：

requestAsync({
 method: 'GET',
 url: 'https://' + servers[num - 1] + ':8033/version.txt'
})
.then(function () { 
  throw new Error("Catch me")
}))
.catch(function (error) {
  console.error(error)
})

jsbin：https://jsbin.com/dewiqafaca/edit?html,js,console,output

Answer 2

只需使用package threadpool; import java.util.logging.Level; import java.util.logging.Logger; class ThreadPoolsThread extends Thread { private BlockingQueueCustom<Runnable> taskQueue; private ThreadPool threadPool; public ThreadPoolsThread(BlockingQueueCustom<Runnable> queue, ThreadPool threadPool) { this.taskQueue = queue; this.threadPool = threadPool; } public void run() { for (;;) { Runnable runnable = null; while ((!this.threadPool.isPoolShutDownInitiated()) && (this.taskQueue.size() == 0)) { } if ((this.threadPool.isPoolShutDownInitiated()) && (this.taskQueue.size() == 0)) { break; } try { runnable = (Runnable) this.taskQueue.take(); } catch (InterruptedException ex) { Logger.getLogger(ThreadPoolsThread.class.getName()).log(Level.SEVERE, null, ex); break; } if (runnable == null) { break; } runnable.run(); if ((this.threadPool.isPoolShutDownInitiated()) && (this.taskQueue.size() == 0)) { interrupt(); try { Thread.sleep(1L); } catch (InterruptedException ex) { Logger.getLogger(ThreadPoolsThread.class.getName()).log(Level.SEVERE, null, ex); break; } } } } }在throw函数中生成标准JavaScript exception，它应该使用您提供的任何值作为参数调用catch块中的函数。

然后承诺/捕获

2 个答案: