Question

我正在尝试在节点js中实现一个队列。我有一个包含元素的数组，我希望每1秒插入一个新的。我想每次只返回队列中的两个元素（每5秒一次）我希望队列继续从遗留的地方返回值。例如。我有一个数组[1,2,3,4]。每2秒我在数组中插入一个新元素。我每5秒从数组中返回2个元素。有谁知道如何使这项工作？这是我的代码：

var queue = require('queue');
var posts=["aaa","bbbb","ccc",'ddd'];
var n=posts.length;
function populateQueue(q) {
  for (var i = 0; i < posts.length; i++) {
    (function(index) {
      q.push(function(done) {
        console.log('done', posts[index]);
        setTimeout(done, 5000);
  posts.splice(0,2);
      });
    })(i);
  }
}

function insert() {
    posts.push({"name":haiku()});
    cxc();
}


function cxc() {
populateQueue(q2);
}



setInterval(insert,2000);

var q2 = queue({concurrency: 2});
populateQueue(q2);
q2.start();


    function haiku(){

    var adjs = ["autumn", "hidden", "bitter", "misty", "silent", "empty", "dry",
  "dark", "summer", "icy", "delicate", "quiet", "white", "cool", "spring",
  "winter", "patient", "twilight", "dawn", "crimson", "wispy", "weathered",
  "blue", "billowing", "broken", "cold", "damp", "falling", "frosty", "green",
  "long", "late", "lingering", "bold", "little", "morning", "muddy", "old",
  "red", "rough", "still", "small", "sparkling", "throbbing", "shy",
  "wandering", "withered", "wild", "black", "young", "holy", "solitary",
  "fragrant", "aged", "snowy", "proud", "floral", "restless", "divine",
  "polished", "ancient", "purple", "lively", "nameless"]

  , nouns = ["waterfall", "river", "breeze", "moon", "rain", "wind", "sea",
  "morning", "snow", "lake", "sunset", "pine", "shadow", "leaf", "dawn",
  "glitter", "forest", "hill", "cloud", "meadow", "sun", "glade", "bird",
  "brook", "butterfly", "bush", "dew", "dust", "field", "fire", "flower",
  "firefly", "feather", "grass", "haze", "mountain", "night", "pond",
  "darkness", "snowflake", "silence", "sound", "sky", "shape", "surf",
  "thunder", "violet", "water", "wildflower", "wave", "water", "resonance",
  "sun", "wood", "dream", "cherry", "tree", "fog", "frost", "voice", "paper",
  "frog", "smoke", "star"];

  return adjs[Math.floor(Math.random()*(adjs.length-1))]+"_"+nouns[Math.floor(Math.random()*(nouns.length-1))];
}

Answer 1

我快速回答这个问题。特别涉及您的问题，但不涉及您的代码。你必须告诉我你的代码是做什么的，否则我无法帮助你。但是关于你的问题，我有这个：

首先，设置初始队列和索引。

let queue = [1, 2, 3, 4, 5],
    index = 0;

现在你必须声明两个函数，（1）在数组中排列值的函数。就我而言，我将一个随机数排队

enqueue = () => {
    queue.push(Math.floor(Math.random()*10));
    console.log(queue);
}

另一个在当前索引处获取两个值，并在存储完成后将索引递增2。然后返回值。

get_two_elements = () => {
    let pointed_slice = queue.slice(index, index + 2);
    index += 2;
    console.log(pointed_slice);
    return pointed_slice;
};

最后，为了让装置工作，你必须像这样对它们施加超时

setInterval(enqueue, 2000);
setInterval(get_two_elements, 5000);

设置间隔是非阻塞的，因此两者都将在几乎相同的时间发生，差异在纳秒和毫秒之间。这将成功地完成您的问题听起来对我的意见。

作为参考，我在这里为您提供了整个代码的要点：

https://gist.github.com/jekku/012eed5ea9c356f8fa29

节点js队列返回数组

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