• Analysis of asynchronous programming interview questions


    1. Interview questions async function async1() { console.log(“async1 start”); await async2(); console.log(“async1 end”); } async function async2() { console.log(“async2”); } console.log(“script start”); setTimeout(function () { console.log(“setTimeout”); }, 0); async1(); new Promise(function (resolve) { console.log(“promise1”); resolve(); }).then(function () { console.log(“promise2”); }); console.log(“script end”); Analysis: async function async1() { console.log(“async1 start”); //6. The console prints async1 start […]

  • Development of 3D application program based on. Net 5


      Finally wait until the release of. Net5, with an excited mood to experience: “fragrance” is a word. How to develop industrial software based on. Net5 is also the concern of the majority of 3D application developers. Our rapid SDK has been the first to support. Net5. It only needs three lines of code to […]

  • Some problems and solutions in the use of idea


    Summary of some common problems in the use of idea 1. When switching the input method, the global search is called up by pressing the CTRL key twice in succession? (1) Press and hold Ctrl + Shift + A, open the search box, and enter registry(2) Click OK to find ide.suppress.double . click.handler , select […]

  • Oracle implicit conversion


    When Oracle performs self implicit conversion: it always converts strings to numbers and strings to dates. When columns are converted, indexes are skipped and performance is reduced. Create a table, index three columns, and test. create table t1(n1 number, v1 varchar2(10), d1 date); insert into t1 select rownum n1 , rownum v1 , sysdate + […]

  • Bert generates a text summary


    By daulet nurmanbetovCompile | VKSource: toward Data Science Have you ever had to summarize a lengthy document? Or provide a summary of a document? As you know, this process is tedious and slow for us humans – we need to read the entire document, then focus on the important sentences, and finally rewrite the sentences […]

  • Understanding and introduction of some concepts in Lua


    1. Understanding and introduction of closure:http://blog.csdn.net/ym012/article/details/7208750 2. Sum up of recursion and tail recursionhttp://www.cnblogs.com/Anker/archive/2013/03/04/2943498.html 3. Metatable, multiple return values, iterator:http://www.cnblogs.com/apexaddon/articles/1461768.html

  • The usage of decode function in Oracle


    The first form: Decode (condition, value 1, return value 1, value 2, return value 2 Value n, return value n, default value)     ​ To achieve data aggregation: Source data:     ​ Summarized data: use the decode function to process the data and summarize the dName field.     ​ The second form: Decode (field or […]

  • JavaScript data structure series (3) stack


    Blog description Due to the practice of writing recently, the information involved in the article comes from the Internet arrangement and personal summary, which means personal learning and experience summary. If there is any infringement, please contact me to delete it! First, the stack constructor is implemented. The code is as follows export default class […]

  • IOS work notes 1


    I’ve been studying IOS for one year. I hope I can keep on developing in this line. I would like to summarize my previous work accumulation just for the convenience of future inquiry and technical summary. I hope you can see the mistakes in the summary and prompt you for correction. Uitextfield allows only numbers […]

  • 2015 technical summary – Preface


    order I haven’t updated this blog for a long time. I always wanted to build a blog with free domain name before, but the effect has not been satisfied. I will continue to complete it after completing this technical summary. After that, I will move the article here to a new blog. I hope you […]

  • Sum up a wave of mistakes


    After finishing the project, I would like to summarize the progress of the project, because I was used to summing up a lot of data in order to summarize the progress of the project The most difficult part this time is actually the evaluation of the whole module, because the data is really a bit […]

  • (1) Three implementations of – springboot2 – applicationcontextinitializer


    The first implementation methodMETA-INF/spring.factories step1: ImplementationApplicationContextInitializerInterfacestep2: resources create in the resource file directory:META-INF/spring.factories, configure key and value as: interface class = implementation class example:(1) . implement applicationcontextinitializer package com.niewj.fileman.initialized; import org.springframework.context.ApplicationContextInitializer; import org.springframework.context.ConfigurableApplicationContext; import org.springframework.core.annotation.Order; import org.springframework.core.env.ConfigurableEnvironment; import org.springframework.core.env.MapPropertySource; import java.util.HashMap; import java.util.Map; /** * @Author weijun.nie * @Date 2020/4/27 8:00 * @Version 1.0 */ […]