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问题描述

我只是从NodeJS开始.我尝试使用NodeJS进行循环,然后才将循环:将我的结果发送到快速模板.

I'm just starting with NodeJS. I try to do with NodeJS a loop and only then : send my result to an express template.

我尝试了许多lib和诺言,但没有一个奏效.节点在结束循环之前先执行然后"操作.

I tried many lib and promises but none of them worked. Node do "then" before ending the loop...

这是我的最后一次尝试,您可以帮我吗?非常感谢.

Here's my last try, can you help me with? Thanks a lot.

[...]
//pveIds contains list of dailies id (object)
var pveIds = body.pve;
//init tab, will contain dailies title
var pveNames = [];

Promise.map(pveIds, function(pveId) {
    // Promise.map awaits for returned promises as well.
    request.get({
        url: 'https://api.guildwars2.com/v2/achievements?id=' + pveId.id,
        json: true
      },
      function(error, response, body) {
        console.log('log 1: ' + body.name);
        if (response.statusCode == 200) {
          return body.name;
        }
      }).on('data', function(v) {
      console.log('log 2: ' + v);
      return v;
    });
  }).then(function(results) {
    console.log("done");
    console.log(results);
    console.log("names tab:" + pveNames);
    res.render('pve.ejs', {
      names: pveNames
    });
  });

推荐答案

您需要return request.get({...而不只是request.get({

现在,函数(pveId)返回的状态不确定,因此Promise.map只会注册一堆未定义的内容,而不是实际的承诺.

The way you have it now your function(pveId) returns undefined so your Promise.map just registers a bunch of undefined's instead of actual promises.

您也不应将promise与回调混合使用,而应使用request-promise而不是request.

You should also not mix promises with callbacks, use request-promise instead of request.

这篇关于nodejs请求,循环和处理承诺的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!

09-05 11:17
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