封面

npm模块分享

平时自己用的npm模块也不算少了,其实网上有很多牛人开发的npm模块都很好,希望不要被埋没了。

一、 实用的模块

1.thunder-vip

作用:获取最新可用的迅雷 vip 账号。
解决什么:不用每次打开网站去找号。。
用法: $ thunder or

var thunderVip = require('thunder-vip');

thunderVip(function (err, accounts) {
console.log(accounts);
});

截图

1

2. npm-user-downloads

npm-user-downloads

查看 npm 用户某个时间段内所有模块的下载量,按从高到低排名。

解决什么:起初是想看自己的那些模块下载量多,好重点维护。。

用法: $ nud hupengbest last-month --limit=20

截图:

1

二、koa开发模块

1. co

作用:异步控制

1 栗子

co(function* () {
var result = yield Promise.resolve(true);
return result;
}).then(function (value) {
console.log(value);
}, function (err) {
console.error(err.stack);
});

2 如果你想把一个 co-generator-function 转成真实的functionu并返回一个promise 可以使用co.wrap(fn*)

var fn = co.wrap(function* (val) {
return yield Promise.resolve(val);
});

fn(true).then(function (val) {

});

3 完整的example

var co = require('co');

co(function *(){
// yield any promise
var result = yield Promise.resolve(true);
}).catch(onerror);

co(function *(){
// resolve multiple promises in parallel
var a = Promise.resolve(1);
var b = Promise.resolve(2);
var c = Promise.resolve(3);
var res = yield [a, b, c];
console.log(res);
// => [1, 2, 3]
}).catch(onerror);

// errors can be try/catched
co(function *(){
try {
yield Promise.reject(new Error('boom'));
} catch (err) {
console.error(err.message); // "boom"
}
}).catch(onerror);

function onerror(err) {
// log any uncaught errors
// co will not throw any errors you do not handle!!!
// HANDLE ALL YOUR ERRORS!!!
console.error(err.stack);
}

4 api

co(fn*).then( val => )
解决一个generator然后返回一个promise

co(function* () {
return yield Promise.resolve(true);
}).then(function (val) {
console.log(val);
}, function (err) {
console.error(err.stack);
});

var fn = co.wrap(fn*)
将一个generator转成普通的function并返回一个promise

var fn = co.wrap(function* (val) {
return yield Promise.resolve(val);
});

fn(true).then(function (val) {

});

2、debug

npm install debug

  1. 使用方法
 //Example app.js
var debug = require('debug')('http')
, http = require('http')
, name = 'My App';

// fake app

debug('booting %s', name);

http.createServer(function(req, res){
debug(req.method + ' ' + req.url);
res.end('hello\n');
}).listen(3000, function(){
debug('listening');
});

// fake worker of some kind

require('./worker');
//Example worker.js:
var debug = require('debug')('worker');

setInterval(function(){
debug('doing some work');
}, 1000);

效果图
1

在windows环境下需要设置环境变量set DEBUG=*,-not_this 我这里使用的是idea的debug调试
1

windows 下启动方式
1

将debug日志转存到文件中
DEBUG_FD=3 node your-app.js 3> whatever.log

3、koa-bodyparser

使用方法

var koa = require('koa');
var bodyParser = require('koa-bodyparser');

var app = koa();
app.use(bodyParser());

app.use(function *() {
this.body = this.request.body;
});

在koa2中使用

npm install koa-bodyparser@next --save

4. koa-json

npm install koa-json --save

使用方法

var json = require('koa-json');
var Koa = require('koa');
var app = new Koa();

app.use(json());

app.use((ctx) => {
ctx.body = { foo: 'bar' };
});

4. koa-webpack-dev-middleware

使用方法

npm install --save-dev koa-webpack-dev-middleware

var app = require('koa')();
var webpackMiddleware = require("koa-webpack-dev-middleware");
app.use(webpackMiddleware(webpack({
// webpack options
// webpackMiddleware takes a Compiler object as first parameter
// which is returned by webpack(...) without callback.
entry: "...",
output: {
path: "/"
// no real path is required, just pass "/"
// but it will work with other paths too.
}
}), {
// all options optional

noInfo: false,
// display no info to console (only warnings and errors)

quiet: false,
// display nothing to the console

lazy: true,
// switch into lazy mode
// that means no watching, but recompilation on every request

watchDelay: 300,
// delay after change (only lazy: false)

publicPath: "/assets/",
// public path to bind the middleware to
// use the same as in webpack

headers: { "X-Custom-Header": "yes" },
// custom headers

stats: {
colors: true
}
// options for formating the statistics
}));
文章目录
  1. 1. 一、 实用的模块
    1. 1.1. 1.thunder-vip
    2. 1.2. 2. npm-user-downloads
  2. 2. 二、koa开发模块
    1. 2.1. 1. co
    2. 2.2. 2、debug
    3. 2.3. 3、koa-bodyparser
    4. 2.4. 4. koa-json
    5. 2.5. 4. koa-webpack-dev-middleware
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