Fawn提供了在mongoDB数据库上执行编辑的能力，作为一系列步骤。如果在任何步骤上发生错误，则数据库将返回其初始状态（事务开始之前的状态）。它基于MongoDB文档中描述的两阶段提交系统。 

安装

npm install fawn

用法

var task = Fawn.Task();

//assuming "Accounts" is the Accounts collection
task.update("Accounts", {firstName: "John", lastName: "Smith"}, {$inc: {balance: -20}})
  .update("Accounts", {firstName: "Broke", lastName: "Ass"}, {$inc: {balance: 20}})
  .run()
  .then(function(results){
    // task is complete 

    // result from first operation
    var firstUpdateResult = results[0];

    // result from second operation
    var secondUpdateResult = results[1];
  })
  .catch(function(err){
    // Everything has been rolled back.
    
    // log the error which caused the failure
    console.log(err);
  });

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