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Question

＆＃13;

var exports = module.exports = {};
var http = require('http');

exports.get = function(key, app, vari) {
    http.get('<url here>/?key='+key+'&app='+app+'&var='+vari+'&req=0', function (response) {
        response.setEncoding('utf8');
        response.on('data', function(body) {
            console.log(body);
            return body;
        });
    });
};

＆＃13;

我的代码（见上文）会很好地将响应输出到控制台，但是当尝试在导出中使用该函数时，它会返回＆＃39; undefined＆＃39;无论。它收到的回复是一行，并且是＆＃34; application / json＆＃34;的内容类型。它有什么用？（不，它不是＆＃34; url在这里＆＃34;，我出于隐私原因删除了网址。如果有帮助，我可以提供。）

Answer 1

exports.get = function(key, app, vari) {

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    http.get('<url here>/?key='+key+'&app='+app+'&var='+vari+'&req=0', function (response) {
        response.setEncoding('utf8');
        response.on('data', function(body) {
            console.log(body);
            return body;
        });
    });
};

Answer 2

reference，你需要听取结束事件并返回一个承诺，就像：

var exports = module.exports = {};
var http = require('http');

exports.get = function(key, app, vari) {
    return new Promise(function(resolve) {
        http.get('<url here>/?     key='+key+'&app='+app+'&var='+vari+'&req=0', function (response) {
      response.setEncoding('utf8');
      var data = '';
      response.on('data', function(chunk) {
          console.log(chunk);
          data += chunk;
      });
      response.on('end', function() {
          resolve(JSON.parse(data));
      });
  });
})

}

Answer 3

我明白了，我只需要一个回答的电话。

＆＃13;

var exports = module.exports = {};
var http = require('http');

exports.get = function(key, app, vari, answ) {
http.get('http://<url here>/?key='+key+'&app='+app+'&var='+vari+'&req=0', function (response) {
        response.setEncoding('utf8');
        response.on('data', function(body) {
            answ(body);
        });
    });
};

＆＃13;

Node.js http.get返回＆＃34; undefined＆＃34;在功能上

3 个答案:

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