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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229 views

1 answer

查找二维数组并返回数组KEY

a= [[4,9],[0,5],[1,6],[2,7],[3,8]]` b= 7 // 需要返回3 如何找到a数组中的b值的位置？...

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

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113 views

1 answer

php - How to list the records in horizontal order using modulus (%) operation?

I have problem in my task where I suppose to display my record in horizontally with 3 columns Unfortunately, my display is become vertical. The task require us to use modulus (%) ... </tr> <?php $i++; } ?> </table> </center> </div>...

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

0 votes

118 views

1 answer

c++ - Modifying Gcode mid-print in response to sensor feedback for concept printer

I'm developing a concept printer that burns images onto wood using a magnifying glass on an xy plotter. One of my anticipated challenges is an inconsistent print quality ... can't find is how to modify Gcode AFTER a print has begun. ideas?...

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

0 votes

92 views

1 answer

python - Creating a loop moving by 10

I'm trying to create two for loops, the first one (k) moving by a window of 10 e.g., (1,10,20,..,90) until 90. and the second one (l) in range (1,100). I ... [values[k][l] for k in range(1,100) for l in range(1, 100)]) thanks in advance....

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

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265 views

1 answer

machine learning - Image loading error in python using tensorflow.keras.preprocessing

I'm trying to load images from a dataset in order to process them in a Neural Network but I have an error while loading them. I don't understand the error and don't know how to fix it. Here are the code and the error...

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

0 votes

125 views

1 answer

amazon web services - Using AWS SQS for API processing

Does anyone have experience/links to articles discussing using AWS SQS within an API architecture? It looks well suited (considering the needs of the API ... context/gotchas that may be out there when considering an architecture like that....

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

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137 views

1 answer

My changes in mystyle.css (vanilla5 skin in pmwiki) doesnt work

So, I've customized my mystyle.css (in vanilla5 skin in pmwiki). I only changed the color from #33F to #abff33. /* * Vanilla5 * A skin for PmWiki 2 (http:/ ... I have no idea why. It also doesnt matter what I change (adding comments etc.)....

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

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100 views

1 answer

vue.js - Unable to render dynamic data list Vue TypeScript

I am trying to render list of an interface that is dynamically updated by the script in the component. <script lang="ts"> import { defineProps, resolveDirective } from 'vue'; ... "x"> <h3>{{data.Value}}</h3> </li> </label> </template>...

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

0 votes

97 views

1 answer

python - Unweighted directed graph distances

Let's say I have an unweighted directed graph. I was wondering if there was a way to store all the distances between a starting node and all the ... me in the right direction for a good Python implementation of this kind of problem?...

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

0 votes

194 views

1 answer

axios中post请求Content-Type的问题

在vue项目中二次封装axios，暴露出一个实例 let instance = axios.create(); instance.defaults.headers['common']['X-Requested-With'] = 'XMLHttpRequest'; // 设置post请求头 instance.defaults.headers.post['Content-Type' ... UTF-8`并不是设置的值虽然后台确实是需要json数据，但是感觉很怪，请问是怎么回事？...

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

0 votes

380 views

1 answer

jestjs - Postgresql and Jest - Insert Returning ID test for failed insert

I am doing some sql testing using Jest. I have a method that will insert data into the database and return its id. const insert = async () => { const ... an error, but not return a value, but without changing the query. Any suggestions?...

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

0 votes

237 views

1 answer

python - Getting list of coordinates (lat,long) from OSMNX Geoseries

I would like to calculate the shortest path between a list of destinations and an origin. But first I need to find the nodes closest to my destinations. I am getting the ... .40466) 3 POINT (15.34169 -4.40443) 4 POINT (15.35278 -4.40812)...

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

0 votes

354 views

1 answer

c++ - virtual insertion operator overloading for base and derived class

Can someone please explain how to ensure that the derived function is called from a pointer of type base to a derived object instead of the base function... Also, are ... // override? { output << // derived details... return output; } };...

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

0 votes

192 views

1 answer

Mouse Cursor is not changing to Pointer on <a> href in asp.net

I have a question it could look silly but its driving me crazy for hours. in asp.net core MVC. the Mouse Cursor when hovering over a href is not chaning ... installed the latest version of boostrap and tried also no luck. any help? thanks....

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

0 votes

22 views

1 answer

ios - ReactiveSwift one vs multiple signal subscriptions and related memory overhead

I have a simple signal, in one of the app components, that returns an array of items: var itemsSignal: Signal<[Item], Never> Those items might contain ... use ReactiveSwift, but I think this is relevant for other Rx libraries as well....

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

0 votes

354 views

1 answer

用 typescript 写的例子，interface 定义类型会报错，type 不会

typescript 3.9.5 interface A { [name: string]: string } interface B { b: string } const b: B = { b: 'b' } const a: A = b // 不能将类型“B”分配给类型“A”。类型“B”中缺少索引签名。ts(2322) 如代码所示，ts 检查报错了。将 interface B 改成 type B 就不报错了，两者用法有什么区别？...

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

0 votes

258 views

1 answer

vite是否用于替换vue cli？

尤大目前开发的这个vite工具说是要告别webpack 启动命令为vue init vite-app 启动后框架结构与vue-cli类似当这个框架完善后是否意味着将在以webpack为构建工具的vue-cli和vite中选用一个框架开发？...

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

0 votes

361 views

1 answer

面试题：写一个算法实现字符串数组按照一定格式转为树形结构

const arr = [ 'root/lufei.jpg', 'root/font/VarelaRound.ttf', 'root/font/SourceSansPro.ttf', 'root/img/avator.jpg', 'root/img/favicon.jpg', 'root/img/bg5.jpg', 'root/img/bg4.jpg', ' ... ' } ] }, { name:'img', children:[ // 其他... ] } ] } ] }...

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

0 votes

53 views

1 answer

为什么console不出来，undefined?

............

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

0 votes

192 views

1 answer

docker镜像用哪个比较快？

如题，我用daocloud每次都是下一半就失败，不知道为什么，阿里云是都直接提示下面这个，我的系统是win10，是我的网络问题吗，请问有什么好的解决方法？ Get https://registry-1.docker.io/v2/: net/http: TLS handshake timeout...

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

0 votes

340 views

1 answer

Golang文本去重的代码优化问题

不好意思啊，第一次学Golang，写了个文本去重来练习，文本内容大概75万行，用go test看了下最后的去重时间，需要17's，想知道还有哪里可以优化的代码如下 package distinct import ( "bufio" "fmt" "io" "os" ... "testing" func TestDistinctFile(t *testing.T) { DistinctFile("result.txt", "out.txt") } 希望师傅们能指点一二...

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

0 votes

193 views

1 answer

数据库主从问题，从库永远比主库少24小时需求，如何处理？

mysql数据库主从问题。比如现在时间为7月15日1点，我希望从库的数据是7月14日1点的数据；并且随着时间的推移，从库数据也跟着更新，但是永远都比主库晚24小时，如何实现该需求？...

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

0 votes

295 views

1 answer

使用模板引擎后，jQuery的html/css方法失效如何解决？

项目背景：bootstrap框架，jQuery库，template-web.js 问题背景：整个页面的HTML代码都写在script标签内，然后使用template加入数据再渲染到页面。模板中的元素使用jQuery语法$("#id").event()绑定的事件和html处理方法会失效，鼠标点击事件和聚焦事件等可以通过委托给父元素的方法处理，那么html处理方法（比如addClass）该怎么办呢...

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

0 votes

62 views

1 answer

IE请求被挂起

有没有碰到这种问题，vue项目在ie上登录不进去，提示此页上的代码禁用了反向和正向缓存。然后看网络请求，登录接口也被挂起我把cookie换成localStorage也不行。这是什么原因啊？求大佬解惑...

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

0 votes

334 views

1 answer

base64图片的前缀是可以随便修改的吗？

图片转成 base64 后前缀为 data:image/jpg;base64, 这个前缀 image/ 后的图片类型是可以随便定义的吗？修改成 data:image/;base64, 或 data:image/png;base64, 或 data:;base64, 并不影响图片的显示。...

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

0 votes

208 views

1 answer

database - What to use for storing configurations?

We have a service that generates a lot of configuration(json) files per user. These files need to be persisted and looked up quickly. What's the right technology ... storage solution? It has to be on-premise though so S3 doesn't work....

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

0 votes

97 views

1 answer

vue provide inject，子组件怎么知道有没有被provide

在 Vue 组件中，假设父组件 <Parent1>，某一代的子组件 <ChildN> 正常来说，Parent1 通过 provide 提供了一个方法或变量 a 给了 ChildN，使得它可以直接访问到 /* Parent1 */ provide() { a: this.a } data() { ... "a" not found 请问 Parent2 在不 provide 的情况下，ChildN 如何处理才不会报错呢？或者 ChildN 怎么知道有没有被 provide？...

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

0 votes

207 views

1 answer

Error while running serverless offline command

I am getting below error on running serverless offline Type Error --------------------------------------------- TypeError: Cannot destructure ... 5) Is there any reason for this error? This was working fine until I have reinstalled my Xcode...

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

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