Jonic Developer Community

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Welcome to Our Knowledge Sharing Community-Open, Learning,Share

Welcome to developer's Knowledge Sharing Community-Open, Learning,Share 欢迎来到程序员专属的知识分享社区! 一个分享知识，传递知识，学习知识的社区！...

asked Feb 5, 2021 in Others[杂七杂八] by ostack (1.4k points)

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545 views

1 answer

node.js - Mongoose find By condition otherwise find all ($or)

if you pass categoryId it will return category with that categoryId but if you don't pass it, I want this route to return all categories... I tried this with $or ... use the if statement but it takes a lot of code, can this be done cleaner?...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

449 views

1 answer

做服务器渲染，页面抵达浏览器后，在框架激活页面的过程中，是不是页面无法滚动？

如题，服务器渲染技术，页面首屏展示快了，但我的页面无法滚动。必须mounted 之后，才能滚。你们遇到过吗？...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

117 views

1 answer

java - Booklet from PDF - Available. PDF from Booklet Example Is Needed

I came across a beautiful project called PrintDF which uses Apache PDF box library to convert a PDF to a booklet PDF. Now can someone help me with the inverse - meaning an example to create a PDF from a booklet PDF. Thanks in advance....

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

328 views

1 answer

我竟然连题目都看不懂，这算法难吗？

给你一个方程，左边用?words?表示，右边用?result 表示你需要根据以下规则检查方程是否可解：每个字符都会被解码成一位数字（0 - 9）每对不同的字符必须映射到不同的数字每个 words[i] 和 result?都会被解码成一个没有前导零的数字左侧数字之和 ... = 5 1 <= words[i].length,?results.length?<= 7 words[i], result?只含有大写英文字母表达式中使用的不同字符数最大为?10...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

179 views

1 answer

How to make a mesh (obj file) a solid on Python?

I've been working with pyvista on Python to filter a scan of my arm, obtaining an obj object in the end. But everytime I try to open the final result on ... so I can print it? Here is the obj file for download Edit: Scan without extrusion...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

365 views

1 answer

iOS开发现在学的东西多吗

本人做的前端，现在想做原生iOS，oc和swift都得学吗？原生开发难度是不是前端大啊，有什么好的建议吗？谢谢...

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

0 votes

239 views

1 answer

html - Why should we link in the HTML5 fallback the same format as the one browser doesn't already support?

I've been reading about embedding videos for my HTML page with multiple sources to maximize support for multiple browsers. However, as in my example below, when we ... > </video> More about this example you can find here: Media file support...

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

0 votes

251 views

1 answer

ruby - Getting data from different file in same folder

I am stuck trying to get my scrapped info into my cli class for a basic cli project. I added my scrapper class and the cli class code. I am trying to ... " end def display_info Stretch.all.each.with_index(1) do |stretch, i| end end end...

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

0 votes

175 views

1 answer

c - shmat() - invalid argument

I′m having some trouble, trying to read the shmem. The program writing the data is giving me no error so i don't know what to do anymore. typedef struct { long id; } data; ... time:%ld ", dados[i]->id); printf("passed %d",i); } return 0; }...

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

0 votes

543 views

1 answer

el-upload 后台返回图片的url，如何再次获得选取图片时的file.raw的一整个对象？

问题描述：通过el-upload上传图片，之后在做修改更新，后台要求我对于没有变动的图片，同样和首次新增上传一样，提交完整的图片信息。这是首次选取图片时，可以拿到的file.raw，有完整的图片信息。通过后台返回图片的url，回显在el-upload中，拿到的file，就不是像上面那样的图片信息了。...

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

0 votes

193 views

1 answer

Setting a widget inside every CustomPainter objects inside a Stack in Flutter

How do I set a widget inside every CustomPainter objects created inside a Stack in the code: import 'dart:math' as math; import 'package:flutter/ ... ); return path; } @override bool shouldRepaint(CustomPainter oldDelegate) => false; }...

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

0 votes

317 views

1 answer

reactjs - Getting error when validate confirm Password in react

Am trying to confirm if password field and confirm password field is match but it giving me error that I specify for confirm password in react even when the characters ... "" : alert(data.error.confirmPassword, "red")} </Col> </FormGroup>...

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

0 votes

405 views

1 answer

eclipse springmvc 修改一行代码快速重启

eclipse springmvc 修改一行代码快速生效使用eclipse开发spring mvc项目,使用tomcat 1.使用tomcat中context为autoreload 2.设置完成后修改1行代码tomcat就会重启,并且重启速度非常慢其实.我仅仅修改了1和行代码,tomcat没有必要重启,将我修改的代码应用即可,有没有其他办法可以不让tomcat重启,然后直接应用我修改的代码...

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

0 votes

387 views

1 answer

App记住密码登录问题

刚接手一个react-native项目，领导需要用hook来重构有个登录的问题，原来它登录的逻辑是：先登录然后再把用户名和密码存到本地中，把登录返回的数据存到redux里，再跳转到首页然后每次修改代码的时候都会刷新APP, 一刷新就回到登录页，在登录页的componentWillMount里获取本地的用户名和密码，然后 ... 一般App记住密码之后是直接到首页还是说回到登录页面自动发送一次请求自动登录呢还是自动登录是不是应该根据token而不是用户名和密码来判断 ...

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

0 votes

430 views

1 answer

React在开发环境下，自行进入调试模式？如何退出或者关闭

如图所示，并没有任何断点，自行开启了调试模式。点击这个按钮会循环进入。请问这个是什么情况？如何解决，谢谢。...

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

0 votes

200 views

1 answer

canvas生成图片时报错

用的是fabric.js canvas生成图片时报错，根据网上的方法请求时我加了随机数和设置了跨域属性。但是还是无效，还会有图片加载多次的问题出现，求解答！...

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

0 votes

443 views

1 answer

H5如何写一套代码友好的兼容pc端和移动端？

H5如何写一套代码友好的兼容pc端和移动端？包括图片兼容问题？现在的解决方式是通过rem还有媒体查询，判断宽度少于一定程度另外写一套css，图片是通过<picture>进行不同宽度的替换,有没有什么更好的方法来做这种兼容处理呢？...

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

0 votes

450 views

1 answer

flutter 使用 dio 上传文件找不到路径,不论是虚拟机还是连接手机调试

_upLoadImage(String path) async { FormData formData = FormData.fromMap( {"file": MultipartFile.fromFile(path, filename: "upload.txt")}); Dio dio = new Dio(); var respone = await dio. ... ); if (respone.statusCode == 200) {} } 路径不管怎么写都读取不到~~...

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

0 votes

210 views

1 answer

sql - (Postgres) How to set value based on row's value

For example, I have this table: Table_A id | classification | key | value | date_time ------+----------------+------------+------------- ... desired output. How can I achieve this? By the way, I am using PostgreSQL 11. Thank you in advance....

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

0 votes

502 views

1 answer

electron应用退出时保存状态与自动登录问题

最近在练习做网易云音乐项目在实现其中两个功能时遇到了一些问题，希望大佬能帮助解答自动登录功能实现思路在用户登录时如果勾选了自动登录选项，就把用户的用户名与密码以加密形式保存在本地数据库，下次用户打开应用在App.vue挂载后直接读取并解密本地的用户名与密码，然后自动调用登录接口，从而 ... ,this.$store.state.musicTime) } }) }) 问题应用关闭后并没有将音乐信息插入或者更新有没有大佬能告诉我这两个问题产生的原因是什么，该怎么解决？...

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

0 votes

381 views

1 answer

如何模拟Android跟ios打开h5的效果，只能用chrome调试？

谢谢大家，电脑分享网络之后，手机连接该网络，可以访问项目，但是我开发的h5只能通过浏览器打开，并不能通过Android或者ios内置的WKWebView或者WebView 因为将来上生产环境后是用app打开的，所以必须适配WKWebView和WebView才可以我现在需要一个app壳，这个app可以打开一个连接就可以了，请问去哪里能找到这种app？...

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

0 votes

165 views

1 answer

javascript - Mouseleave event still shows "cannot read property 'remove' of null"?

Why is my nodeRemove variable returning 'Cannot read property 'remove' of null'? And how to solve this? I already tried to set up an if statement but still, when the mouseleave ... ; } console.log("this works 6"); }); } })() }, 10000);...

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

0 votes

215 views

1 answer

javascript - ZeroMQ.js: With zmq.Pair, if socket.send() is called outside of an async loop, then the messages will not not received by the receiver

My setup macOS 10.15.7 zeromq.js: v6.0.0-beta.6 node.js: v14.4.0 I'm using ZeroMQ.js to communicate between my app's frontend and backend. The ... issue. But this is suboptimal. Question Is this by design or am I doing anything wrong?...

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

0 votes

317 views

1 answer

sentry接入钉钉消息无法收到报错信息

sentry V9.1.2 接入了gitHub 这个https://github.com/anshengme/... Test 可以收到，项目报错一直出现错误求助万分感谢...

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

0 votes

293 views

1 answer

匈牙利算法的时间复杂度问题

匈牙利算法用链表时间复杂度是O(M+N)？不是O(N^3)吗，还是说链表通过处理可以优化匈牙利算法有人能解释下不？...

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

0 votes

221 views

1 answer

关于前端下载的问题？

后台的文件是按照流的形式传递给前端，如果文件太大，刷新页面，前端的下载请求，就没了导致下载失败我看chrome的下载，好像是在后台进行的，跟页面的刷新没什么关系，如何解决刷新页面导致下载失败的问题尼...

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

0 votes

137 views

1 answer

View commits (and diff) pertaining to a particular git branch

Suppose I have the following git structure: A - B - C - D - E - F master \_ G - H - I branch git checkout branch; git log doesn't identify the point at which branch diverged from master. What if I want to examine all changes in this branch?...

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

0 votes

367 views

1 answer

如何向一个指定的邮箱发送1W封邮件

如题：我们现在有一个邮箱收取的一个性能测试的任务，如要测试当邮箱数量大于1W时收取服务的性能如何，所以现在需要伪造一些邮箱数据。但是如何得到这个1W封邮件的邮箱是一个问题，由于是给测试同学写伪造数据的工具，所以不想太耗工时（2天之内）现在遇到的困难是 1、各大邮箱都有每日发送邮件限制大概（100-500不等） 2、各大邮箱都有每日IP接收限制，固定IP的话，很快就会被邮箱服务器限制住各位大佬有没有好的思路？...

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

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