当我尝试使用“new”实例化该类时,我得到“HttpHandlers不是构造函数”错误.
正在实例化的类(../lib/restifyHandlers/HttpHandlers)：
var config = require('config');
module.exports.config = config;
var util = require('util');
var _ = require('underscore');
var EventEmitter = require("events").EventEmitter;
var HttpHandlers = function(eventHandlers) {
var _self = this;
this.name = "HttpHandlers";
if (!(this instanceof HttpHandlers)) {
return new HttpHandlers(eventHandlers);
}
}
util.inherits(HttpHandlers,EventEmitter);
HttpHandlers.prototype.extractHttpHandlersRequest = function(req,res,next) {
var _self = this;
req.locals = {};
res.locals = {};
}
module.exports.HttpHandlers = HttpHandlers;
拨打电话的代码：
var HttpHandlers = require('../lib/restifyHandlers/HttpHandlers');
var obj = new HttpHandlers(oneRouteConfig.eventHandlers);
堆栈跟踪：
2016-09-10T23:44:41.571-04:00 - [31merror[39m: Sun,11 Sep 2016 03:44:41 GMT Worker #master: exiting from error: TypeError: HttpHandlers is not a constructor
TypeError: HttpHandlers is not a constructor
at setupRestifyRoute (/usr/apps/das/src/myrepo/nodejs/myapp/lib/router.js:78:14)
at Router.setup_routes (/usr/apps/das/src/myrepo/nodejs/myapp/lib/router.js:40:3)
at /usr/apps/das/src/myrepo/nodejs/myapp/bin/server.js:222:14
at initialize (/usr/apps/das/src/myrepo/nodejs/myapp/bin/server.js:38:9)
at setup_server (/usr/apps/das/src/myrepo/nodejs/myapp/bin/server.js:107:4)
at /usr/apps/das/src/myrepo/nodejs/myapp/bin/server.js:275:4
at /usr/apps/das/src/myrepo/nodejs/myapp/node_modules/temp/lib/temp.js:231:7
at FSReqWrap.oncomplete (fs.js:123:15)
解决方法
当你分配这个时：
exports.HttpHandlers = HttpHandlers;
您需要将其与此匹配：
var HttpHandlers = require('../lib/restifyHandlers/HttpHandlers').HttpHandlers;
您将模块的属性指定为.HttpHandlers,而不是分配整个模块,因此如果您需要该属性,则必须引用该属性.如果您希望它以其他方式工作,您可以更改为：
exports = HttpHandlers;
然后,你的require()可以按照你这样做的方式工作：
var HttpHandlers = require('../lib/restifyHandlers/HttpHandlers');