NodeJS模块导出

时间:2015-11-10 00:04:25

标签: javascript node.js httpclient

我有一个简单的http客户端模块(api.js),它返回一个承诺,如下所示:

 exports.endpoint = '';

        exports.GET =  function(args){
            args.method = 'GET';
            args.uri = this.endpoint + args.uri;
            return asyncApiCall(args);
        };
        exports.POST =  function(args){
            args.method = 'POST';
            args.uri = this.endpoint + args.uri;
            return asyncApiCall(args);
        };
        exports.PUT =  function(args){
            args.method = 'PUT';
            args.uri = this.endpoint + args.uri;
            return asyncApiCall(args);
        };
        exports.DELETE= function(args){
            args.method = 'DELETE';
            args.uri = this.endpoint + args.uri;
            return asyncApiCall(args);
        };

        var asyncApiCall = function(args){
            var rp = require('request-promise');
            var options = {
            method: args.method,
            uri: args.uri,
            body : args.body,
            json: args.json
        }

        return rp(options);

        };

我使用这样的模块:

var api = require('./api.js');
var args = {
    uri : '/posts'

}
api.endpoint = 'http://localhost:3000';
api.GET(args)
    .then(function(res){
                console.log(res);
            }, function(err){
                console.log(err);
            });

现在,我想尽可能地改进模块。有没有办法不重复export.functionName?我在NodeJS中找到了module.exports,但在这种情况下我不确定如何使用它。如何在asyncApiCall函数中设置一次端点变量,而不是所有返回asyncApiCall的其他函数?

3 个答案:

答案 0 :(得分:2)

很多人选择将他们的导出方法放在一个新对象上并通过module.exports导出,例如

var myExports = {
   get: function () {},
   post: function () {}
}
module.exports = myExports;

As for module.exports vs exports

看起来设置一个完整的构造函数可能是合适的,你的方法与它绑在一起,如下所示:

var requests = function (endpoint) {
   this.endpoint = endpoint;
}

requests.prototype.GET = function (args) {
    args.method = 'GET';
    args.uri = this.endpoint + args.uri;
    return asyncApiCall(args);
}

// And so on

module.exports = requests;

然后这样称呼它:

var api = require('./api.js');
var endpoint = new api("http://localhost:3000");

endpoint.GET()

答案 1 :(得分:2)

只是另一种风格:

var rp = require('request-promise'); // Put it here so you don't have to require 1 module so many times.

var asyncApiCall = function(args) {
  var options = {
    method: args.method,
    uri: args.uri,
    body : args.body,
    json: args.json
  };
  return rp(options);
};

// Let's hack it.
var endpoint = '';
var apis = {};
['GET', 'POST', 'PUT', 'DELETE'].forEach(function(method) {
  apis[method] = function(args) {
    args.method = method;
    args.uri = endpoint + args.uri;
    return asyncApiCall(args);
  }
});

module.exports = apis;
module.exports.endpoint = '';

答案 2 :(得分:1)

将其包装在一个类中并导出一个新的实例

function Module() {

}

Module.prototype.GET = function () {}

module.export = new Module()
// or
module.export = Module
// to call the constructor for your endpoint variable.