Programmer Think

Reference material: http://boto3.readthedocs.io/en/latest/reference/services/dynamodb.html Recently, due to the need of work, we have studied the dynamoDB part of boto3, and have some experience. Here we summarize it. The first is the boto3 installation, which runs on a machine equipped with python and pip sudo pip install boto3   In the of ...

Requirements: Locally record what the user entered last time Using Key Technologies: Local Storage Step 1: Use jQuery's common notation 1. JS code // Obtain window Of localStorage object var localS = window.localStorage; // Obtain localStorage Value var getV = localS.getItem("value0"), getV2 = localS.getItem("value1"); // Assign the acquir ...

Sometimes, when doing static pages, we need to use pagination. Of course, in most cases, pagination is done in the background. When users request data, we will talk about the advantages and disadvantages of the two later. Therefore, we call it pseudo-paging here. This paging is divided into four parts, the first is the page layout. In order ...

WebApi Catalog (?)[-] A get request Base type parameters Entities as parameters Array as parameter Strange get request 1WebApi method name starts with get 2WebApi method name does not start with get Two post requests Base type parameters 1 Wrong Writing 1 Wrong Writing 2 correct usage 3 Recommended usage Tri p ...

1. Preface Because the company's recent projects are busy, there are not so many spare events to write articles, so this article was released a few days later. But it doesn't matter, but when it comes, it always comes.Well, let's not say much about the others. You should know when you develop, there are many common examples of operations. For e ...

Record Kotlin common problems and code. 4. Use when to express that multiple case s meet the criteria and the judgment should be complete. Using Kotlin's when expression to judge that multiple case s are eligible, Java is switch(x) { case 1: case 2: break; } There's a pit here. There's a way: fun check(value: Any?): String = when (value) { ...

Preliminary understanding brief introduction Electron lets you use pure JavaScript to call rich native APIs to create desktop applications. You can think of it as a variant of io.js that focuses on desktop applications rather than web servers.This does not mean that Electron is JavaScript bound to the GUI library. Instead, Electron uses web pag ...

Previous remarks ES5 contains five primitive types: Character string,number,Boolean value,null and undefined . ES6 introduces the sixth primitive type, Symbol The object attribute names of ES5 are strings, which can easily cause property name conflicts. For example, if you use an object provided by someone else and want to add a new method t ...

1. let const block-level scope Deconstructive Assignment of Variables 1. Deconstructive Assignment of Variables let [a, b, c] = [1, 2, 3]; Extract values from arrays and assign values to variables according to their corresponding locations let [foo] = []; let [bar, foo] = [1]; If the deconstruction is unsuccessful, the value of the vari ...

This paper focuses on the design and implementation of restful interface, using express and monogoose.Click on the express tutorialClick on the monogoose tutorialES6 Introduction Course - Ruan Yifeng's blog Noe4.x support for ES6 is not perfect and a higher version of node is recommended.In practical development, add'use strict'to the header of ...