NodeJS：在多个模块中引用相同的变量

Question

在节点中，我正在创建一个通过websockets连接到slack的模块实例。我用$.ajax({ url: "data.json", //force to handle it as text dataType: "text", success: function(data) { //data downloaded so we call parseJSON function //and pass downloaded data var json = $.parseJSON(data); //Not sure what to do after this } }); 执行此操作。如何进行设置以便在几个不同的模块中引用相同的const slackbot = new SlackBot()？每次我想在模块中调用它时，最好的方法是将slackbot传递给模块函数吗？

slackbot

Answer 1

一种做法是

/** slacbot.js */
const slackbot = new SlackBot();

someModule.doThing(data, slackbot)
.then((response) => {
  otherModule.doAnotherThing(response, slackbot);
})
.then((response) => {
  someModule.wrapUp(response, slackbot);
});

// getter    
var getSlackBot = function(){
  if(slackBot) return slackBot
  else {
    slackbot = new SlackBot();
    return slackbot;
  }
}

module.exports.getSlackBot = getSlackBot;


/** consumer.js **/
var slackBot = require('slackBot').getSlackBot();