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Recent questions in Technique[技术]

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go - Check for nil in pointer receiver function

Is it possible that in go pointer receiver function the pointer will be nil? In which case? Sample code: type JSONBytes [] ... = nil. Is it possible that buffer will be nil? When?...

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

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586 views

1 answer

关于GET 请求会被浏览器主动缓存下来，留下历史记录问题

关于get和post的区别中有一条为：从缓存的角度，GET 请求会被浏览器主动缓存下来，留下历史记录，而 POST 默认不会。我在我的项目中调用了多次同一个get接口但是历史记录中只有一次在页面中这些get接口都是同一页的不同tab栏为什么我调用get请求没有生成多条历史记录呢？...

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

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158 views

1 answer

在python里怎么调用或者复写这个js

var ua = new Uint8Array(32); window.crypto.getRandomValues(ua); 'Uint8Array' 未定义...

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

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252 views

1 answer

java - Generate AES and RS256 keys

In one of my project there is a requirement to generate RS 256 keys. I googled and found a couple of links ... https://www.scottbrady91.com/OpenSSL/Creating-RSA-Keys-using-OpenSSL...

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

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640 views

1 answer

为什么VUE在向Android获取数据时，Android只能给一个页面数据？

一个很奇怪的现象，只有当根路径 / 重定向的那个页面的方法才能够成功的被Andorid调用并拿到数据，而其他页面的方法则会被报 uncaught Type 的未定义方法错误，这是什么原因呢？路由： const routes=[ { path: '/ ... 程等等问题，尝试多种方法后依然无法解决，请大家帮我看看吧，弄了好久了，整个人都快废了### 问题描述...

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

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446 views

1 answer

Angular相对Vue缺少的这些功能，是否有最佳实现方案？

更新：框架的对比本来就不是为了分出高下，每个框架都有自己的适用场合优缺点这里只是结合自己的使用感受，列举一些点，不管是厘清现状还是寻求解决之道，希望集思广益 Angular 模块化 NgModule -- Vue是人工规划依赖 ... 一些功能点吧，用起来是真的非常实用或许是Angular的设计思想没有触及到这几点吧，不知道最佳实现方案会是什么？...

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

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269 views

1 answer

vue.js - working directory is not a cordova project

After running npm run build-prod-cordova-android in my framework7 vue project my build is successful but I get ... structure Kindly indicate what is wrong and possible solutions....

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

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258 views

1 answer

java中出现错误：java.lang.NullPointerException？

求助大神帮忙解答：错误出现在这一行： g.drawImage(new?ImageIcon(getClass().getResource("image\"+"棋盘.jpg")).getImage(),? ... swing.ImageIcon.<init>(ImageIcon.java:217) at?DrawUI.paint(DrawUI.java:31)...

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

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357 views

1 answer

不理解为什么ON子句中的OR和连续连接的效果不同？

select * from a join b on (a.userid = b.id or a.clientid = b.id) select * from a join b b1 on (a.userid = b1.id) join b b2 on (a. ... 两个sql语句我的理解应该效果是一致的，但是现实却不同，我有哪里理解出现问题了么？...

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

0 votes

164 views

1 answer

c++ - Why do I have to access template base class members through the this pointer?

If the classes below were not templates I could simply have x in the derived class. However, with the code below, I have to use this ... main() { derived<int> d; d.f(); return 0; }...

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

0 votes

592 views

1 answer

Go 语言的字符串的字节使用 UTF-8 编码标识 Unicode 文本是什么意思？

这里是不是说的矛盾？ Go 字符串 Go 语言的字符串的字节使用 UTF-8 编码标识 Unicode 文本。 UTF-8是一种编码，Unicode也是一种编码，只能取其一，这里指的是什么意思？...

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

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383 views

1 answer

如何系统的学习typeScript并运用于项目中

求教大神们，如何系统的学习typeScript并运用于项目中，推荐一些可以练手的例子~...

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

0 votes

446 views

1 answer

linux 后台挂起swoole,莫名奇妙的退出

不知道为什么。。...

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

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613 views

1 answer

naming conventions - How to name a class that moves through the data structure in no particular order

I have a data structure with an underlying immutable undirected graph. Separately, I have another class that handles ... familiar, shorter, or related to the graph terminology....

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

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467 views

1 answer

Spring-Boot JPA - Inserting into Two Table Relation Inheritance with single forms in angular

I'm attempting to save records to a database two table that includes a foreign key using Spring-Boot and angular but I ... patient at the same. any help can be appreciated thank uu...

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

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481 views

1 answer

Element如何实现点击树形控件子结点时，selector选择器自动与其同步？？？

上面是我登录界面时初始化的数据，selector也是初始化设置为GSL2，当我点击CORS4_LD2时，如何才能让selector同时显示CORS4_LD2，有大佬能指点一下嘛？？？？？？？？？？当我点击selector下选框时， Tree控件的点击函数如下： // ... 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 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

142 views

1 answer

How is NullPointerException in Java 14 different from its predecessor?

One of the important features that were introduced with Java SE 14 was the Helpful NullPointerExceptions which is related to ... in Java SE 14 more usable than its predecessor?...

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

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403 views

1 answer

Vue的项目，用了vue的路由，页面之间怎么通信

vue项目，比如A页面显示用户有10元钱，点击到了B页面，消费花了3元。此时点击返回，因为A页面没刷新，所以还是10元能不能实现，B页面能控制A页面刷新，或者让A页面执行一个函数，不知道有没有这种东西啊...

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

0 votes

209 views

1 answer

python 3.x - How to confirm multiprocessing library is being used?

I am trying to use multiprocessing for the below code. The code seems to run a bit faster than the for loop inside the function. ... )) pool.close() # 'TERM' pool.join() # 'KILL'...

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

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229 views

1 answer

java - Attribute android:configChanges and it's accepted values

Okay, so I know literally know nothing of Java and minimal of Android. With that said, I have run across a certain attribute ... on LG Aristo 5 for Metro. Any help will do thanks!...

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

0 votes

479 views

1 answer

gulp-babel 编译Zepto.js 编译的结果有问题

首先来看问题： <!DOCTYPE html> <html> <head> <meta charset="utf-8"> </head> <body> </body> 这个是用gulp-babel构建出来的zepto.js,没有其他 ... .js](https://www.html.cn/doc/zeptojs_api/)）不知哪位大佬知道这是为啥？...

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

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306 views

1 answer

Vue导航守卫的一个问题

to.id是undefined的 to.params.id才是有效的 props不是已经绑定了吗？...

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

0 votes

176 views

1 answer

mysql和mongodb的比较

各位大侠，我现在想存储网站的一些数据，例如用户的几个用户来访，几个用户点击主页等，相关字段是固定的，需要不定时的插入+1的增加操作，也有读取操作，类似这样的需求，我是用一个mysql表还是用mogodb呢？哪种效率更高？...

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

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184 views

1 answer

javascript - How can I extract data from this returned object in an async function?

I'm trying to do some work in JavaScript - I call an async function from an async function, as shown below. ... or need additional parts of my program, please let me know....

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

0 votes

572 views

1 answer

nuxt.js - Apple silicon failed to start project Nuxtjs project

I install homebrew native on my m1 MacBook Pro, and I installed yarn and node using home-brew without any problem ... it raises error say error Command failed with signal "SIGILL"...

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

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257 views

1 answer

android - Flutter Application Performance on armeabi-v7a

So I was testing my application on this, and noticed it was unbearably sluggish. I tried installing a version specific to ... 23) (emulator) Specs for the device can be found this...

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

0 votes

280 views

1 answer

ios - How to connect MQTT server with using .crt SSL certificate file?

I have m2mqtt_srv.crt SSL certificate file. I am using CocoaMQTT library. I want to connect my MQTT server on port 8883. Below is ... I have to use? I have no idea how to do it?...

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

0 votes

498 views

1 answer

Spring security Oauth2整合获取token的问题？

通过oauth2.0自带的接口 oauth/token 可以获取到token 和refresh_token等信息，但是这个接口需要传递好几个参数 http://localhost:7500/ ... =cpms_oauth_server&client_secret=cpms_oauth_server 怎么样可以只传递用户名和密码就可以拿到token呢...

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

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Recent questions in Technique[技术]

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