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如何在节点js中执行多个Post请求

post node.js javascript

1

user1hjgjhgjhggjhg · 技术社区 · 7 年前

你好,我想根据一些条件做多个post请求。我正在尝试,但我的代码不起作用。我有一个在线数据库(Firebase)。我要做的是从联机获取数据并保存到localdb中,然后删除联机数据。

这就是我目前所做的

request('http://my-url here', function (error, response, body) {
    console.log('error:', error);
    console.log('statusCode:', response && response.statusCode); Print the response status code if a response was received

    var data = [];
    var parse = JSON.parse(body);

    var ids =  Object.keys(parse);
     var i = 0;

   ids.forEach(function(id) {
   var unique_keys =  Object.keys(parse[id]);
        unique_keys.forEach(function(unique_key) {

            data[i] = [

                    parse[id][unique_key]["lat"],
                    parse[id][unique_key]["long"],



                ];
                i++;
   });

 });

    saveHistory(data, function (result) {

        console.log("successfully save into local db");
        removeDataFromOnlineDatabase
        process.exit();

    });





}); 

function removeHistoryFromOnlineDatabase(){

    var request = require("request");

   console.log("function get called");
    var options = { method: 'DELETE',
        url: 'url here',
        headers:
            { 'Postman-Token': '4a126ab8-9b3e-465d-b827-d4dd83923610',
                'Cache-Control': 'no-cache',
                'Content-Type': 'application/json' } };

    request(options, function (error, response, body) {
        if (error) throw new Error(error);

        console.log("history has been removed" + body);
    });

}

我试过上面的代码,但是这个函数 removeHistoryFromOnlineDatabase 后请求不起作用

函数get called并打印“function get called”,但它不打印“history has been remove”

2 回复 | 直到 7 年前

1

0

bharath 7 年前

移动 process.exit(); 在下面 console.log("history has been removed" + body);

2

0

Hardik Shah 7 年前

因为您正在调用函数,然后立即行退出进程。 process.exit() 在你的 removeHistoryFromOnlineDatabase 函数执行。

请注意:- 我已经删除了较小代码的JSON数据选项。

方式1: (使用 Callback ) (仅回拨)

saveHistory(data, function (result) {

    console.log("successfully save into local db");
    removeDataFromOnlineDatabase(function(error, response){
       process.exit();
    })

});

function removeHistoryFromOnlineDatabase(callback){
  var request = require("request");
  console.log("function get called");
  var options = options;

  request(options, function (error, response, body) {
    if (error){
     callback(error, null); 
    } else {
     console.log("history has been removed" + body);
     callback(null, response) 
    }
  });
}

方式2: (使用 Promise ) (仅承诺)

var Q = require("q");

saveHistory(data, function (result) {
    console.log("successfully save into local db");
    removeDataFromOnlineDatabase()
    .then(function(){
      process.exit();
    }).catch(function(){
       console.log("ERROR IN REQUEST");
    });
});

function removeHistoryFromOnlineDatabase(){
  var request = require("request");
  console.log("function get called");
  var options = options;

  return Q.promise(function(resolve, reject){
    request(options, function (error, response, body) {
      if (error){
        reject(error);
      } else {
        console.log("history has been removed" + body);
        resolve(response) 
      }
    });
  });

}

方式3: (使用 promise - Q.nfcall ) (回拨+承诺)

var Q = require("q");

saveHistory(data, function (result) {
    console.log("successfully save into local db");
    Q.nfcall(removeDataFromOnlineDatabase)
    .then(function(){
      process.exit();
    }).catch(function(){
       console.log("ERROR IN REQUEST");
    });
});

function removeHistoryFromOnlineDatabase(callback){
  var request = require("request");
  console.log("function get called");
  var options = options;

  request(options, function (error, response, body) {
    if (error){
     callback(error, null); 
    } else {
     console.log("history has been removed" + body);
     callback(null, response) 
    }
  });

}