QA Official

jQuery Countdown Settings Properties such as Days, Hours, Minutes, Seconds Only Need to Modify Expiration Time -20130724

https://qaofficial.com/post/2019/04/14/70185-jquery-countdown-settings-properties-such-as-days-hours-minutes-seconds-only-need-to-modify-expiration-time-20130724.html 2019-04-14
1、效果及功能说明 通过对时间的控制来告诉用户一个活动还剩多少时间,精确到秒2、实现原理 首先定义活动的截至的时间,要重年份精确到毫秒,在获得当

jquery Sends Mobile Phone Verification Code Countdown Plug-in Supports Page Refresh

https://qaofficial.com/post/2019/04/14/70182-jquery-sends-mobile-phone-verification-code-countdown-plug-in-supports-page-refresh.html 2019-04-14
In the latest project, we need to use SMS Verification Code to send short messages. After searching the Internet for half a day, we couldn't find a satisfactory one, so we wrote one ourselves. jquery's packaged countdown plug-in for sending mobile phone verification codes uses cookie to prevent page refresh. 实现思路: 1.实现点击按钮,对手机号进行

pip virtualenv requirements

https://qaofficial.com/post/2019/04/14/70146-pip-virtualenv-requirements.html 2019-04-14
pip can easily install, uninstall and manage Python packages. virtualenv can establish multiple independent virtual environments, each with its own python interpreter and its own package package, which do not affect each other. pip and virtualenv can work together well, and it is very convenient to use both tools at the same time.pip is usually installed first. After installation, pip install virtualenvcan automatically download and install virtualenv from the internet.

Cross Validation

https://qaofficial.com/post/2019/04/14/70196-cross-validation.html 2019-04-14
form of cross-validation K-fold cross-validation, the initial sample is divided into K sub-samples, a single sub-sample is retained as the data of the validation model, and the other K-1 samples are used for training.Cross-validation is repeated for k times, and each sub-sample is verified once. The results of average k times or other combination methods are used to finally obtain a single estimation.The advantage of this method is that randomly

Introduction of VirtualBox Network Connection Mode

https://qaofficial.com/post/2019/04/14/70145-introduction-of-virtualbox-network-connection-mode.html 2019-04-14
VirtualBox is a very excellent virtual machine program produced by SUN. The version is also very complete. You can find the version suitable for various operating system platforms on the official website.Here I will give you a general explanation of the network configuration and application of VBox.VirtualBox provides four network access modes, which are:1. NAT,Network Address Translation Mode (NAT)2. Bridged Adapter Bridge pattern3. Internal internal network mode4.

Machine Learning -CrossValidation Cross-Validate Python Implementation

https://qaofficial.com/post/2019/04/14/70198-machine-learning-crossvalidation-cross-validate-python-implementation.html 2019-04-14
Copyright Statement: This article is original. Please indicate the source for reprinting. 1. Principle 1.1 concept Cross-validation is mainly used in model training or modeling applications, such as classification prediction, PCR, PLS regression modeling, etc.In a given sample space, most samples are taken as training sets to train the model, and the remaining small samples are predicted using the newly established model, and the prediction error or prediction accuracy of

Priorities and Combinations of Operators and Various Operators in Java and Arrangement of Precautions

https://qaofficial.com/post/2019/04/14/70078-priorities-and-combinations-of-operators-and-various-operators-in-java-and-arrangement-of-precautions.html 2019-04-14
(1) Arithmetic Operator Java运算符 算术运算符 代数表达式 Java表达式 加 + a+1 a+1 减 - a-b a-b 乘 * ab a*b 除 / a/b a/b 求模/余 % a mod b a%b Note: 1 > there is no power arithmetic operator in Java 2 > there are no operators in

Start and shut down Oracle rac database cluster

https://qaofficial.com/post/2019/04/14/70088-start-and-shut-down-oracle-rac-database-cluster.html 2019-04-14
Just like learning the operating system, after installing rac clusters, the first thing to do is to learn how to start and shut down rac. Generally, there are three ways to start and shut down RAC: sqlplus,srvctl, dbconsole or oracle grid control. This section briefly introduces the use of srvctl to start and shut down RAC database clusters! Use crs_stat command to query whether asm instance, listener, Global Service Daemon,

System Skills and Fault Handling

https://qaofficial.com/post/2019/04/14/70092-system-skills-and-fault-handling.html 2019-04-14
Modify the right-click menu of the file (such as adding an opening method)运行注册表编辑器,打开“我的电脑/HKEY_CLASSES_ROOT/*/shellex/ Contex

Which folders in Windows system can be deleted

https://qaofficial.com/post/2019/04/14/70091-which-folders-in-windows-system-can-be-deleted.html 2019-04-14
windows文件夹中的哪些文件可以删除 经过以下的设置后,你的系统会更加清爽、简洁、高效! 1.打开“我的电脑”-“工具”-“文件夹选项”-“