Learn to use console.time with console.timeEnd to get accurate timings of operations in javascript. This tool can help with javascript profiling and performance optimization, and knowing how to use the console to do it means you don't have to pollute…

ERROR StatusLogger No log4j2 configuration file found. Using default configuration: logging only errors to the console. log4j版本:log4j-core-2.7.jar   log4j-api-2.7.jar log4j2只支持xml和json两种格式的配置,所以配置log4j.properties时,是没有作用的. log4j 2.0与以往的1.x有一个明显的不同,其配置…

Learn how to use console.table to render arrays and objects in a tabular format for easy scanning over the values. We'll create some mock data and then render it to the log in various ways to explore console.table's API. function Character(name, powe…

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace datatable { public class ConsoleTable { /// <summary> /// This will hold the header of the table. /// </summary> priv…

配置 log 信息传输到控制台 参考官网:https://docs.djangoproject.com/en/2.1/topics/logging/ By default, this config only sends messages of level INFO or higher to the console (same as Django’s default logging config, except that the default only displays log records…

1.1shelve模块 shelve 模块比pickle模块简单,只有一个open函数,返回类似字典对象,可读可写:key必须为字符串, 而值可以是python所支持的数据类型. shelve模块主要用来存储一个简单的数据, shelve最重要的函数是open,在调用它的时候,使用文件名作为参数,它会返回一个架子(shelf)对象,可以用它来存储类容. f = shelve.open(r"shelve_test.txt") # aa = {"stu1":{"…

by Anthony Vallone How long does it take to find the root cause of a failure in your system? Five minutes? Five days? If you answered close to five minutes, it’s very likely that your production system and tests have great logging. All too often, see…

iOS 本地数据持久化存储: 1.plist 2.归档 3.NSUserDefaults 4.NSFileManager 5.数据库 一.CoreData概述 CoreData是苹果自带的管理数据库的工具.使用Core Data有很多原因,其中最简单的一条就是:它能让你为Model层写的代码的行数减少为原来的50%到70%. 这归功于之前提到的Core Data的特性.更妙的是,对于上述特性你也既不用去测试,也不用花功夫去优化. Core Data拥有成熟的代码,这些代码通过单元测试来保证品质.…

废话少说,先上代码 File:logger.conf [formatters] keys=default [formatter_default] format=%(asctime)s - %(name)s - %(levelname)s - %(message)s class=logging.Formatter [handlers] keys=console, error_file [handler_console] class=logging.StreamHandler formatter=d…

我们经常使用隐藏控件或者是js全局变量来临时存储数据,全局变量容易导致命名污染,隐藏控件导致经常读写dom浪费性能.jQuery提供了自己的数据缓存方案,能够达到和隐藏控件.全局变量相同的效果,但是jQuery实现方式更优雅.为了更好地使用jQuery数据缓存方案,我们需要掌握$.data().$.cache.$.expando.$.hasData().$.removeData(). $.hasData()用来判断某个对象是否有附加的属性,可以给任何JavaScript对象和HTMLElemen…