node.js - 如何在不使用 for 循环的情况下将变量传递给请求回调？

Question

例如，如果我喜欢这样做:

var request = require('request');

function callback(error, response, body) {
  if (num) {
    console.log(num);
  }
  console.log(body);
}

var cookie = {
  '74358942795': 'abd7fce573c2-18c2c0de-037f-4aef-9235',
  '58942743795': 'e3101e9a0e28-b596998e-e879-4003-a724'
}

function options(num) {
  return {
    url: 'http://.../.../',
    method: 'POST',
    headers: {
      ...
      'Cookie': cookie[num]
    },
    body: '...=' + Date.now()
  };
}

(function(num){
  request(options(num), callback);
})('74358942795');

在回调中，它将返回 num undefined 并抛出错误。

Answer 1

Igor 的回答几乎是正确的。应该是:

function callback(error, response, body) {
  var that = this;
  if (that.num) {
    console.log(that.num);
  }
  console.log(body);
}

(function(num){
  request(options(num), callback.bind({num}));
})('74358942795');