Question

我正在尝试创建两个node.js文件。我正在使用事件发射器模块。当我尝试搜索数据时，我想发出一个事件，以便在从对象数组返回数据之前引发事件。

// event emitter file:
 var EventEmitter = require('events').EventEmitter;
 var inherits = require('util').inherits;
  var _ = require('underscore');

  // Custom class 
  function EmployeeEmitter(args) {
  this.data = args;
  EventEmitter.call(this);
  }
  inherits(EmployeeEmitter, EventEmitter);

  EmployeeEmitter.prototype.lookupByLastName = function (name) {

         this.emit('lookupByLastName',name);

         if( _.where(data, {lastName:name}))
         {
           return _.where(data, {lastName:name})
         }

        else{

                return;
              }
            };
   module.exports.EmployeeEmitter = EmployeeEmitter;

现在这是我的事件发射器，我想在用户搜索数据时触发lookupbylastName。为了测试它，我创建了另一个文件，我使用event.on方法。不幸的是它'没有运行它给我错误我不知道Wats出错了。

      //Test file:
         var colors = require('colors');

         var EmployeeEmitter = require('./employeeEmitter').EmployeeEmitter;

          // Usage
       var data = [
        {id:1, firstName:'John',lastName:'Smith'},
        {id:2, firstName:'Jane',lastName:'Smith'},
         {id:3, firstName:'John',lastName:'Doe'}
        ];

      var employees = new EmployeeEmitter(data);
      employees.on('lookupByLastName', function (args) {
     });

     console.log("\nLookup by last name (Smith)".red);
     console.log(employees.lookupByLastName('Smith'));

尝试获取数据时发生的事件

0 个答案: