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345 views

1 answer

python - I drew a Ball from class and It's stuck in the same place (python3/pygame)

I have a Ball class and I drew a ball from that class. No matter what coordinates I put the ball is either ... 8,red) while loop: ball.Draw(window) pygame.display.flip screenshot...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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375 views

1 answer

比较年份，用substr截取前4位快，还是date('Y')快?

1问题描述：根据始末日期查询数据，由于数据库数据量大，用between and很慢，就添加了year,month,day字段，在比较年月日的时候有substr和date两种方法，两种都尝试过每次加 ... "; } }else{ $str = " where log_date between '$startTime' and '$endTime' "; }...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

447 views

1 answer

toast在iOS模拟器上兼容性不好，无法显示出来

在真机上跑modal.toast()，能够正常显示。在iOS模拟器中却蹩脚了。...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

722 views

1 answer

npm安装全局包时Error: EPERM: operation not permitted

安装命令： cnpm install vue -g 错误如下: Error: EPERM: operation not permitted, mkdir 'C:ProgramFiles odejs ode_modulesvue_tmp' at Error (native) ... org vue -g 是全局安装包的问题？还是cnpm本身的问题？...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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298 views

1 answer

algorithm - How, do I select the best match for a string in multiple documents, where the score is equal for both?

I have implemented an algorithm in Elm, where I compare a sentence (user input) to other multiple sentences (data ... similar? which methods are used to retrieve this similarity?...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

376 views

1 answer

mysql无法保存emoji表情

mysql版本为5.7，已经将数据库字符集设置为utf8mb4了，如图：字段的字符集也已经改了： `content` text COLLATE utf8mb4_unicode_ci NOT NULL COMMENT '评论内容' 但是页面提交过来 ... content' 页面上的编码用的UTF-8，框架用的是laravel，请大神指点哪里的配置还有问题？...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

289 views

1 answer

请问这个model类是自动生成的，还是手写的？

这是SSH框架的项目下，一个用户的实体model...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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428 views

1 answer

同一账号，如何实现另一用户登陆后，之前用户自动下线

如题，如何实现？...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

330 views

1 answer

node.js - Heroku Discord.js ffmpeg

I wrote a discord music bot, and i used ffmpeg so that i put the executable in the botfolder, now i ... .1]: at processTicksAndRejections (internal/process/task_queues.js:97:5)...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

1.3k views

1 answer

need advice with passing a javascript value into html format so i can show a grade screen of correct answers instead of 'document.write'

below is the code for the check function that will store the value of the 'c' variable and the document.write ... Torvalds Kohsuke Kawaguchi previous Back to Question 1 {{/each}}...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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255 views

1 answer

r - How to write to csv files using specific column data from txt files using loop in python?

I have 167 (genes) X 26 (population) files with data as follows in each file. (Number of columns in each file is ... my first time using R. Is it possible to attach some files?...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

314 views

1 answer

所谓的量化交易程序，其目的是帮助股民或者基金公司的投资者选股票对吗？

所谓的量化交易，到底是给基金公司的投资顾问或者基金经理使用的呢？还是给广大股民看股市数据，便于炒股的？本人没买过股票，只在支付宝买过一些基金和定投，赚了几毛几块钱对基金的了解只限于，其实就是多买几只股票，所谓的不要把鸡蛋放到一个篮 ... 估计，基金投资经理可能会有一般人看不到指标，而不仅仅我上面说的这些普通人容易理解的数据我说的对吗？请大神指教 ...