Recent questions in Technique[技术]

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如图父组件中，修改了hightQuery的值然后调用子组件函数（传参是hightQuery），发现立面的值没有修改为空子组件中打印：测试以后发现只有子组件重加载以后才会获得最新的父组件传来的值，想知道有没有办法能随时监听到并渲染的办法吗？...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Continue writing to a file with max size in C++

I want to write to a text file with limited size (1KB for example) and when the file reaches the maximum size I want the first half ... ,9] the new file will look like: 4 5 6 7 8 9...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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724 views

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TypeScript中enum枚举类型的实现原理？

ts中的代码： // 数字枚举 enum PostStatus { Draft = 0, baidu = 1, sougou = 2, } 上述编译为js代码： var PostStatus; (function (PostStatus) { PostStatus[ ... 1, sougou: 2} 对上述js代码的执行顺序不是很明白，求解答，十分感谢 ...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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722 views

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DolphinDB是否支持创建空表

login("admin","123456") db=database("dfs://stations", VALUE, 2020.01.01..2020.12.31) pt = db.createPartitionedTable( ... ). Please provide one or a list of tables as model schema....

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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excel - How to Open workbook?

I have this macro that used to work nicely for a while. I replaced seemingly irrelevant function Insert ... Close SaveChanges:=False ActiveWorkbook.Sheets(1).Activate End Sub...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Non-hashable static arguments are not supported in Jax when using vmap

This is related to this question. After some work, I managed to change it down to the last error. The code looks like ... to be static, yet it still tells me that it is traced....

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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How to setup a VXLAN tunnel between two hosts in one Mininet topology?

I am trying to set up a VxLAN tunnel in the below topology: This is how i added VXLAN ports on both OVSs These ... . But no connectino is happening between host h1 to host d1....

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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vue页面加载完成请求的数据加载到select里面，数据拿到了，结构里没有

如图，是一个下拉框组件我在页面加载完成时拿到了下拉框的数据，用this.userLevelData = res.data 将请求到的data赋值到下拉框的值但是点击下拉框，下拉框组件里并没有这是什么清况？找到原因了： ... 打印res.data居然没有我打印res就是data 可以拿到数据丢进select了，但是这拿数据是被封装过么？搞不懂啊...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.3k views

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how to remove Null:[] in Json in Python

I've been stuck in streaming insert .Json data into BigQuery but Null:[] in .json data causes error like this ... ("Encountered errors while inserting rows: {}".format(errors))...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.5k views

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gradle - How to skip a specific migration

Does anybody know, how can I skip a specific migration using Flyway? I mean, to not execute and not write ... see records only for migrations V1, V3 in flyway_schema_history table....

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - What is the best way to run a web app using gunicorn at certain hours of the day?

I have a little dashboard that runs with python - dash and I've already deployed it successfully in production using ... end of the day after launching it with noHup? Thanks!...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.7k views

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macos - Any workaround for Java/Swing bug under Mac OS when opening new windows as tabs

I'm developing a swing based Java application (Java 8) for Mac and Windows. Some users have set the mac system ... the user and quit the application (not really a good solution)...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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2.3k views

1 answer

css中fixed 位置问题

`<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title> ... 示这是为什么不是都是根据可视区定位吗为什么不同位置效果不一样...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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2.2k views

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vue中使用xlsx后不能返回数据

// vue <input type="file" @change="importExcel($event)" ref="importExcel" id="importExcel" style="display:none;" accept="application/vnd. ... 现在的问题是：我封装渲染后想返回zdata，但是就是显示undefined...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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2.5k views

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python - How to add a value to a a list?

I have the following list. import datetime my_list = [ ['Morocco', 'Fish', datetime.datetime(2020, 11, 17, 0, 0),'0,012'], [' ... output: [[Morocco, '0,252'], ['Spain', '0,266']]...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - is there a way to pass undefined.undefined as a function parameter

I want to check if object has a field with value then return default value if it has not.. function testFun(value, ... } } let testVar testFun(testVar, 'this is default vaue')...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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3.5k views

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formatting - Why is the output format changed when running two PowerShell commands in one line?

I'm getting unexpected results when executing two PowerShell commands separated by a semicolon. The output of the ... the groups are listed. Am I improperly separating commands?...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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4.2k views

1 answer

mac docker --net=host 无效

mac docker --net=host 无效 docker run -p 8080:8080 ........ 这样写可以访问到是系统问题还是配置有问题？...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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3.8k views

1 answer

hive查询报错

我在每次添加where条件，或者使用子查询时，都会报这个错误以下是报错详情 java.lang.Exception: java.sql. ... .java:1979) at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)...

asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)

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4.4k views

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SpringBoot返回文件流报"远程主机强迫关闭了一个现有的连接"

var out = response.getOutputStream(); while ((len = br.read(buf)) > 0) out.write(buf, 0, len); br.close(); out.close(); 报错的行是out.write( ... 闭了浏览器，导致无法继续write 请问有什么办法可以判断用户已经关闭了请求？...

asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)

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4.0k views

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linux - Starting VSCode and running command in integrated terminal from command line?

The title summarize my question, but the long version would be that I am trying write a shell script that opens Visual ... any solution to this issue? Thanks in advance for help!...

asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)

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4.7k views

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关于一对多的表设计以及查询优化的困惑，现在每个记录都需要查询对应多个标签，怎么查询最快？

每条记录下都需要查询出对应的三类，假设记录是 1、2、3、4、5 五条记录每一条记录有A、B、C三类，然后每一类下有对应多个。例如 A下面有A1、A2、A3...多个tag。那么查询一条记录就需要先查询A类 B类 C类，然后在循环查询每一个类的tag 。如何查询性能才能最好？或者说用什么方法或者思想？恳请路过的各位有知道的给回复一下。...

asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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4.0k views

1 answer

js for循环把tree结构转换为list

假设有这样一个data，我需要把children提取出来与外面那层同级，然后去除children，也就是说我需要整个data只有一级只有一层，然后这里面children里的pid要等于父级的id sort排序从0开始，比如label为 1 的父级底下的 ... 2-2', sort: 1 }] 说的可能有点乱，大婶们如果没听懂我在说啥请轻喷，麻烦你们了！！...

asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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4.2k views

1 answer

设置理想视口后，如果内部元素设置的宽度大于视口宽度，为什么body不会撑开，元素会超出body？

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1 ... > </body> </html> 如果去掉理想视口，margin：auto; 会多出边距；...

asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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4.4k views

1 answer

java - Thread.sleep() starts before my JButton text changes (The animation is too long) How to prevent this?

I have a method here that creates 52 JButtons in a loop. When a button is clicked, according text is displayed on ... through and then the buttons return to not having any text....

asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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3.7k views

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monorepo模式下如何动态修改package.json中的module值

采用monorepo模式构建了一个组件库，整体工程运行正常，但是存在一个问题：拿其中一个模块说明：该模块的package.json配置如下： { "name": "@hecate/h-button", "version": "1.0.0", "license ... 相关代码粘贴代码文本（请勿用截图）你期待的结果是什么？实际看到的错误信息又是什么？...

asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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3.8k views

1 answer

Print output in Excel file in Python

I compare two txt files, find a match and print the line that matches and three corresponding lines after. I have read ... (next(f)) else: StopIteration my_xls.save("results.xls")...

asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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3.9k views

1 answer

PHP checkbox validation checked or not checked

I've been using similar code to this for my project and I'm able to get all of the "Checked" checkboxes using ... even a solution for the problem. Any help would be appreciated....

asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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