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js 在控制台输出4行4列0，其中2个数字被2,4替代，且刷新一次，2,4数字会相应改变？

突然想到一个小练习，想在控制台输出类似 0 0 0 0 0 2 0 0 0 0 4 0 0 0 0 0 数组类型对的练习，图中2,4位置每刷新一次都会在4行4列中随意位置出现，分析思路如下： 1写初始化4行4列00000界面; 2写随机 ... 套，好久没练习，写不出来，请教！初始化界面如下： 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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学习做一个安卓视频播放器，有一些小问题！忘大家请教

最近在学习安卓开发，有一些JAVA基础，想做一个简单的视频播放器，现在卡到了获取视频文件路径这一点上，现在已经会用Mediaplay，video等控件，但是只能每一次在AS中输入程序路径，想能够在程序上去获取本地所有视频路径，然后可以选择播放，可 ... 也运行不起也看的不是很懂，所以希望大家能给一个思路，我好在去学习这个查了快一点了，也没有解决！谢谢大家...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ubuntu - Custom desktop launcher shows on picker but not dash in gnome shell

I have Ubuntu 20.10 installed and created an app (ruby/gtk3) and wrote a desktop file for in ... /resources/static/icon.png Terminal=false Type=Application Categories=Application...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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接口的mp4地址被后台java进行加密。但传过来的这种mp4加密过的rsa如何用js解密呢？

接口的mp4地址被后台java进行加密。但传过来的这种mp4加密过的rsa如何用js解密呢？...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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.net - Debugging Hello World

I'm learning C# and have write some very basics on the Microsoft Learn platform. I installed VSCode and .NET and when I ... clean output of my code in? I'm on macOs Catalina....

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Ionic在安卓版微信上遇到的问题（select很难选中）

ionic1.2.4版本在安卓版微信上，select标签很难点中，之前看到有人通过升级ionic版本至1.3.2解决了这个问题，但是由于目前app已经在生产环境中运行，担心升级ionic版本后会带来其他问题，有什么好的解决办法吗？...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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为什么node.js删除item.json删不掉，但是里面的数据会清掉，而且关掉服务的时候，又会自动删掉item.json?

exports.pushdata = function(req,res){ var isDelete = false; fs.readFile('./uploads/item.json','utf8',function(err,data){ if(err) throw err; var ... ({ "msg":"输入成功", }) } } }) }); }...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Twitter 发表内容的富文本框是什么原理制作的?

twitter 的发表框支持插入表情,网络上的教程都是使用 iframe 来创建的,他的没有 iframe 他是什么原理实现的? 我希望用 jquery 实现,如果可以,感谢....

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Is there a way to ask tox to run environments matching a name or by group?

I have a tox.ini with several envs, like this example: [tox] envlist = py37, py38, py39, lint-{foo,bar,baz} ... For ... handle this, but I'm searching for a built-in way to match....

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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pycharm运行python3.6突然出现R6034问题，请问如何处理？

我是win10系统，我试着在C:WindowsSystem32目录下删除所有含有msvcrXX.dll的文件，但是无法删除，然后我又把python3.6卸载了然后又重新安装了，也重启了多次，但是这个问题依然存在，请问如何处理？我发现pycharm只要是用python3.6编译的就出这个问题，如果用python2.7编译的项目没这个问题。...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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php - Yoast Plugin Won't Detect Content from Shortcode in a Custom Plugin

I have created a pretty simple shortcode that contains html and php and wrapped it between the following code and used the ... to the basic shortcode to get this to work? Thanks....

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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real time - Scheduling algorithm which minimizes maximum lateness is optimal (it finds a feasible schedule, if one exists)

I need to understand why if a scheduling algorithm A minimizes maximum lateness, then A is optimal (it finds a feasible ... that A is not able to minimize the maximum lateness....

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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关于npm的几个问题

我fork了一个项目，然后这个项目可能就是作者很少去维护了然后他当初在构建项目的时候使用的插件和包是比较老的版本问题如下：装完依赖以后，提示（deprecate=反对）这个更新！！问题是： 1.我手动在package.json里面去修 ... 修改以后如果插件的api修改以后那么原先构建的代码就会有问题！ 2.你们是怎么解决上面这个报错的？...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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How to replace mutliple values in a list in c#?

If I have a list of 100 integers, how would I assign the values at index 20 to 50 to a different set of values in ... without looping but am unsure if it is possible to do in c#....

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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在echarts3中怎么使用echarts2中的wordCloud

1.问题项目中需要用到字符云我在项目中导入的是echarts3 echarts3中没有wordCloud 的api 同时下载的echarts3中也没有wordCloud.js 只有2中有wordCloud.js 不知道在echarts3中怎么使用echarts2中的 ... 吧 2.报错 3.希望希望可以在这方面有经验的大神可以给个解决方法谢过...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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新手求助；一个函数

想写一个入口函数只要调用这个入口函数之前没有执行完毕的函数都不再执行缓存也要清掉不知道咋弄...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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node.js 运行报错

在mac下运行就没问题，再windows下面运行就报错。...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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我仿了一个网页，其中像素是固定大小的，但是在手机端打开，却是布局没被破坏，而是成比例缩小，这是为什么？

<head> <meta charset="UTF-8"> <meta name="keywords" content="云班课,班课,翻转课堂,移动教学,智能设备教学,教学,JiTT,互动,即时互动,签到,大学,手机应用,经验值,积分"> ... teach.js"></script> </head> 这是在手机端打开的，布局是缩小了，但是没被破坏？为什么...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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stackexchange.redis - StackExchange Redis TTL Notification

When using the Stack Exchange Redis Cache in an MVC application, Is there any way to be notified when a TTL expires....

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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261 views

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React Native 安卓运行报错 java.lang.NullPointerException

$ ./gradlew installDebug --stacktrace --info 130 ? Starting Build Settings evaluated using settings file ' ... (DependencyManager.java:155) at com.android.build.gradl...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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CENTOS7下编译安装PHP5.3时候遇到错误

CENTOS7.2 编译安装 PHP 5.3.28 配置命令如下： ./configure --prefix=/usr/local/php5 --with-config-file-path=/usr/local/php5/etc --with-config-file-scan- ... ，该怎么更正？多谢！ --更新--------------------...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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我在仿一个网页，源代码是把像素写成固定的，但是在手机上浏览，但是却不被破坏,这是为什么？

我最近在仿一个网站的首页，右键查看源代码的时候，发现最外层盒子都是固定成960px,然后margin:0 auto;按道理在手机上打开的时候是产生滚动条的，但是整个页面却缩放成与手机一样大小，是因为引用了什么插件吗？还是什么原因？...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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v4l2 - Google chrome cannot detect v4l2loopback device

I'm trying to transmit my screen using ffmpeg and v4l2loopback, more when running the commands: sudo modprobe v4l2loopback devices ... If anyone can help me, thank you in advance!....

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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apache spark - Can I use a trained model of MLlib in Scikit-learn?

I have a project where I train on big data, but I predict on one sample. I want to train the model using ... trained model in Scikit-learn or any other library out of PySpark?...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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swift - ARKit and ResNet 50

I made recognition using ResNet 50. How do I add the ability to find out the distance from one object to another using ARKit ... not using SwiftUI. I want to do as in the picture....

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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305 views

1 answer

MySQL substract first row from last row of a group

I'm working on creating Google Charts from MySQL datasource. This works fine so far. Now I want to count how many blocks of ... its not a stupid question. I'm kinda new to this....

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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318 views

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sql - Cumulative Calculation - Based on Sample Data

Hi I am providing Sample Data below: Based on Sample data I want result output as per screenshot .. create table mytable ... insert into mytable values ('Nancy',6640,1500,2020,3);...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1 answer

document.addEventListener('click',()=>{console.log(this)})

document.addEventListener('click',()=>{console.log(this)})这个this为什么指向window？...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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