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reactjs - react-router-dom does not work. Element type invalid error

I am trying to start a react project and to use react-router-dom The index.js file looks like below import React from ... exactly but cannot find.... Thank you for help in advance!...

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

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466 views

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c - _Generic works with typedef structs or only with primitive types?

Generic o(X) is used to construct Object from several types. But GCC don't expands to typedef types. warning: ... any mistake or Generic don't work with structs and typedefs?...

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

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请问python提取东方财富软件内L2数据并分析,有哪些思路以及方法？

资金210万亏到130多万，希望大家入市谨慎有在用tushare，但是提供的数据毕竟没有L2多，是否能有办法保存L2的各种数据？已买了L2行情账户，python如何抓取软件内的数据？（比如：实时挂单，逐笔成交，分时指标，特色指标，分时股票名 ... 如识别图像保存数据？请大神分享一下思路，以及要用到哪些库，谢谢！如果能够成功，我会把数据分享给大家！...

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

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node.js - npm ERR! 405 Method Not Allowed: ionic cli

I am getting this error when I run npm install -g @ionic/cli I tried to refer other related questions but I ... Not Allowed: express@latest What should I do to reolve this error...

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

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postgresql - Do local versions of postgres foreign data wrappers update automatically?

Apologies if this is answered in the docs or somewhere else obvious, but I have just gone through the rigmorale of having ... updates or is this IMPORT SCHEMA a copy of the data?...

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

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c# - EF Core async methods hang/deadlock after await

Update: The issue was actually unrelated to async - my database was out of sync and the LINQ queries were ... dispatch that uses entirely async/await within a single thread....

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

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node.js - How to avoid writing same code for remoteMethods by calling remoteHooks in loopback 3?

I'm working on loopback 3. and I've defined remote hook methods like beforeRemote and afterRemote('find'). by ... operation hooks, but user defined isn't working like that....

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

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kubernetes - aws eks and aws sso RBAC authentication problem

I have created a fresh AWS SSO (used internal IDP as identity source, so no use of Active Directory). I am able ... .k8s.io kind: User name: team-sso-devops namespace: default...

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

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ruby on rails - Heroku Killing all processes with signal SIGINT ends silently without any error

I am using heroku local to start my frontend and backend. Running heroku local -f Procfile.windows quits silently ... start and bundle exec rails server individually works fine....

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

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521 views

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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 ... 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)

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请问json文件可以用字符串的形式保存吗？

data.json文件↑ 疑问1:vscode的json文件代码都是对象形式的，可以用字符串的形式吗？ fs.readFile('./data.json',function (err,data) { var students2 = JSON.parse(data ... 的students3不用加双引号呢？不知道我的理解有没有错，求大佬解惑_(:з」∠)_...

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

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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: ... } @override bool shouldRepaint(CustomPainter oldDelegate) => false; }...

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

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1 answer

安装vue-cli4.0时加入typeScript，但是写代码的时候报错了

安装vue-cli4.4.4的时候，问我是否安装ts，我选择了是为了验证能否用ts，我加入了这行代码然后就报错了 <script> export default { data () { return { } }, mounted(){ let ... false;确实是ts的语法 ts目录是vue-cli自动帮我配的，所以这就很奇怪，为什么会报错呢？...

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

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359 views

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router.beforeEach对性能有影响吗

最近在项目里使用了router.beforeEach实现前端的权限控制，具体使用过程就是根据后端的菜单接口，对每次跳转的路径在beforeEach做判断是否存在于菜单里面。所以想问下使用router.beforeEach每次判断对页面性能是否有影响？根据影响是否可以使用？...

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

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python - Can I make the import package only check for the package if that class or function is called?

I only want to import a package when the function using that package is called. Is there any way I can do this ... import noepixel or board til I call the .metarmap method!')...

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

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请问css怎样实现三角形缺口呢？

如图，2个三角形缺口...

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

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325 views

1 answer

unix - Function clock() in C

While studying the clock () function located in time.h, I asked myself the question of making a simple program to see ... ; printf("Time taken %d seconds ",msec/1000); }...

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

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angular8 - Angular 8x - Directive dynamic parent not occupies the parent dimensions

I am appending the component with dynamic element i create. it appending correctly. but the dynamic element is not ... ref.location.nativeElement); } } } Thanks in advance....

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

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引用来自网上的图片，有时需要手动加载，如何解决？

如题，我做一个网站，爬取了一些文章加图片，我直接引用网上的图片src不修改，但放久了就加载不出来了，需要自己点图片链接进去看一下，才能加载出来，可能就持续了一天，这样我要是很多图片那得一个个点开我的天?，或者有什么办法直接全部加载吗，正在写javaweb...

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

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typescript - What is the way to define an object with a dynamic number of properties?

I'm trying to assign the correct shape to an object that serves as the initialValue of the reduce method. This ... a union type. Consider using a mapped object type instead....

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

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398 views

1 answer

input 使用v-model 传值后小数不精确

...

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

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396 views

1 answer

在使用nhooyr.io/websocket的时候发生这样的报错

...

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

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205 views

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linux 静态路由无效

我在一家云服务器厂商购买了两台服务器，子网互通，称为node1(172.16.0.2)以及node2（172.16.0.5），现在node1跟远程的一台服务器core(192.168.0.91)构建了ipsec隧道,node1已配置了 ... .0.0 172.16.0.2 255.255.255.0 UG 0 0 0 eth0 求解，问题出在哪？...

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

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前端转后端开发转型成功的机会有多少，在哪里

前端在岗，如果往后做纯后端，在本家公司或者后面的公司，对于转专业的人说，机会有多少？需要具备什么样的能力才可以做这样的工作？只要具备专业能力就够了么？如何证明其具备这样的能力？谁有这样的经验能够提供这个问题的答案？...

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

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309 views

1 answer

java - Pagination of firestore data while scrolling in recyclerview

I'm trying to implement pagination in a recyclerview. My code works fine without pagination but I can't seem to ... of code but nothing really explains it clearly.. Kind regards....

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

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321 views

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ssh远程登录时能不能切换shell？

问题描述服务器是AIX系统，默认shell是ksh，无法使用TAB补全功能。我想在ssh远程登录时切换shell为bash。能不能实现？问题出现的平台版本及自己尝试过哪些方法 AIX 7 使用ssh -t 选项可以切换bash，但是无法使用一些命令，如sqlplus。 ssh root@myhost -t bash...

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

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251 views

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class="el-table__expanded-cell" 怎么设置样式

class="el-table__expanded-cell"怎么设置样式，这是elementUI中的一个组件的，我用.el-table__expanded-cell{}不起作用。...

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

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工作非技术问题

本人应届生一枚，下周入职某厂测开。现在是实习僧，感觉每天过的没意思，研发出问题case study测试来背锅。请问未来何去何从，想入职后找其他岗位...

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

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