We'll learn how to take advantage of Ramda's automatic function currying and data-last argument order to combine a series of pure functions into a left-to-right composition, or pipeline, with Ramda's pipe function. A simple example will take 'teams'…

This article is an in-depth tutorial for using Kafka to move data from PostgreSQL to Hadoop HDFS via JDBC connections. Read this eGuide to discover the fundamental differences between iPaaS and dPaaS and how the innovative approach of dPaaS gets to t…

Javascript's Object.assign is shadow merge, loadsh's _.merge is deep merge, but has probem for array. const person = { name: { first: "Joe" }, age: , color: "green", pets: ["dog", "lizard"] }; const update = { name:…

本文系统讲解vue-cli脚手架build目录中的karma.conf.js配置文件 这个配置文件是命令 npm run unit 的入口配置文件,主要用于单元测试 这条命令的内容如下 "cross-env BABEL_ENV=test karma start test/unit/karma.conf.js --single-run" 这条命令中的 cross-env 是跨平台设置环境变量,你在命令行中设置环境变量加上这句话就是了 karma start test/unit/karma…

当同事使用vue-pdf来浏览pdf之后,就发现build之后一堆散乱的js文件,真可怕! 果然google之后是它的原因.参考:Vue-pdf create 168 excess bundles in webpack. 解决方案: 安装vue-pdf 3.0.1. $ npm install vue-pdf@ --save-dev 截图: 成功打包成单个文件! 成功打开PDF文件(图片已做模糊),上一页和下一页的功能正常!…

How to build a sortable table in native/vanilla js? H5 DnD https://developer.mozilla.org/zh-CN/docs/Web/API/HTML_Drag_and_Drop_API https://developer.mozilla.org/en-US/docs/Web/API/DataTransfer/setDragImage https://codepen.io/webgeeker/pen/mjoWqw http…

As a beginner of Crocks.js, it was a problem for we to figure out when to use .map() and when to use .chain(). Of course, using the docs help: map: State s a ~> (a -> b) -> State s b chain: State s a ~> (a -> State s b) -> State s b The…

因为刚学rails,试着做了一个小系统操作微信公共帐号, 之后部署的时候遇见了一个问题,整套系统在互联网端访问,非常的慢,而在手机端访问,10s后才会有响应, 打开chrome的调试工具,发现application-(xxxxdigestxxxxxx).js 这个文件有800多k 之后打开这个文件发现,里面包含有未压缩的jquery 注释版,以及重控件 ckeditor 的代码 于是,问题变成了 1. 如何将jquery 脱水压缩 2. 只在需要时候再加载其他重控件 比如 ckeditor 的j…

You can isolate parts of templates you want to re-use into components, but you can also reuse those components across pages using layouts. This lesson walks you through creation a navigation component then extracting it out into the default layout. l…

// 下面是引入nodejs的路径模块 var path = require('path') // 下面是utils工具配置文件,主要用来处理css类文件的loader var utils = require('./utils') // 下面引入webpack,来使用webpack内置插件 var webpack = require('webpack') // 下面是config目录下的index.js配置文件,主要用来定义了生产和开发环境的相关基础配置 var config = require…