What did new do in JavaScript, and how did it relate to the prototype chain?

Original text: https://legacy.ofcrab.com/press/javascript-new.html If we talk about JavaScript's new in an object-oriented way, it's still hard to understand. We can understand it in another direction. You humans I am a programmer and a person. I may: There's a loud name. Born on a certain day It's a man. I can walk. I can still run. Still hop ...

Posted by greencoin on Sat, 18 May 2019 19:07:21 +0200

Detailed parsing of I/O operations

I/O operations Article Directory I/O operations 1: File operation 1. Determine whether the file exists 2. Determine whether it is a file 3. Create and delete files 4. Create a directory 2: I\O Flow Operation 1. (1) OutputStream with byte streams 1. (2) Write using a character output stream (Writer) 2. Read data using by ...

Posted by illzz on Sat, 18 May 2019 13:23:52 +0200

Java Develop - MySQL-based SQL protocol/optimized record

1.SQL protocol 1. Statute of Forms Required three fields: create table `demo` ( `id` bigint(32) not null auto_increment comment 'Primary key', `gmt_create` timestamp not null default current_timestamp comment 'Active Creation Time', `gmt_modified` timestamp not null default current_timestamp on update current_timestamp comment 'Passiv ...

Posted by AndyB on Sat, 18 May 2019 13:07:56 +0200

Operations and Maintenance Management Platform Development Ideas

1 Application Technology back-end Python3.7 Django2.x Celery4.x Saltstack Restful Mysql Redis Front end jquery bootstrap bootstrap-table bootstrap-fileinput 2 Implementation process 2.1 CMDB Asset Management 2.1.1 Asset Input Fill in the form on the front page. Submit data to Django background. Write to Mysql database through Django Orm o ...

Posted by herbal_lavender on Sat, 18 May 2019 08:39:29 +0200

php Source Building Blog 4--Implementing MVC Architecture Mini-Framework

Mainly: Constant optimization path Automatic loading class Optimizing entry files Secure Access Project Directory File structure: ----------------------------------------------------------------------------------------------------------------------------------------------------- blog├─App_-Model ModelUserModel.class.php User Model Cl ...

Posted by jeremy_brooks on Sat, 18 May 2019 05:54:25 +0200

ORA-01779: Cannot modify columns corresponding to non-key saved tables

Today, Zhongshan company lets the dispatching arrangement batch be seen remotely, because it is the same source program, making the formal library will not report errors, making the test library will report errors, thinking of the problem of data or database settings, so it debugs the source program, and the program will report errors when it c ...

Posted by RedRasper on Sat, 18 May 2019 05:25:08 +0200

Analysis of Superdetailed Guava Rate Limiter Current Limiting Principle

Current limiting is one of the three powerful tools to protect high concurrent systems, and the other two are cache and degradation. Current limitation is used to limit concurrency and requests in many scenarios, such as second-kill snap-up, protection of their own systems and downstream systems from being overwhelmed by huge traff ...

Posted by Tux-e-do on Sat, 18 May 2019 05:21:07 +0200

Summary of adb utility commands

For Android programmers, adb is frequently used in their daily work. Now, we summarize the commonly used adb commands in their work, which is convenient for inquiry and also for your reference. Viewing application memory usage, power consumption, startup time, wakelock, running monkey commands played a small role in previous application per ...

Posted by plasmahba on Sat, 18 May 2019 05:02:03 +0200

Redis deep shallow - hash, set

I. Hash 1.1 Introduction The dictionary in Redis is implemented using a hash table as the underlying implementation, where a hash table has multiple nodes and each node holds a key-value pair. In Redis source files, the implementation code for the dictionary is in dict.c and dict.h files. Redis's database is implemented ...

Posted by randomfool on Fri, 17 May 2019 22:33:11 +0200

golang foundation (33) exception handling

golang_real.jpg Beginners tend to ignore exception handling in the program, thinking that the program is always running in a cared-for environment, without any wind or rain, because we are the most knowledgeable people of our program. So we know what he likes, what he can eat and what he can't eat. But one day he returned to ...

Posted by spartan789 on Fri, 17 May 2019 14:49:32 +0200