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df<-data.frame(ID = c(1,1,1,2,3,3,3), test = c(NA, 5.5, 6.4, NA, 7.3, NA, 10.9)) I want to create a variable called "value", ... ), value = c(5.5, 5.5, 5.5, NA, 7.3, 7.3, 7.3))...

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

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861 views

1 answer

微信小程序的事件在哪里查

像bindtap,bindchange 都不知道干啥的,文档也不是特别系统...

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

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1.6k views

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python - Why do I get " stat: path should be string, bytes, os.PathLike or integer, not tuple" type error?

I am trying to group files into folders based on the prefix of the filename. Error: os.stat(path) TypeError: stat: path ... ) Any insights as to where I did it wrong? Thank you....

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

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1.2k views

1 answer

DolphinDB在执行query时报错：Java heap space

在使用Dolphin执行如下query语句时： db = databese("dfs://testdb") pt = loadTable(db,"pt") select * from pt where ... execution was completed with exception Java heap space 请问应该怎么处理？...

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

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1.0k views

1 answer

django开发阶段CSS有些页面可以加载，有的却加载不出来。

我正在学习django,做书上的项目，是一个简单的电商网站，css放在pstatic下的CSS文件夹文件名main.css，静态资源都是拷贝书上提供的必要的设置都在settings里进行了设置，而且，主页（index）商 ... alert(data.result); }); }); }); {% endblock script %} 本来应该是这样的...

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

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1.4k views

1 answer

how can I combine tests or reuse data in spock

I have a situation where I want to create some data using a post request and then use the result of that post in few other tests, ... "5" "Chemistry" | "Elements" | "120" | "3" }...

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

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1.7k views

1 answer

ios - WKWebView full screen with hidesBarsOnSwipe of navigation bar

I want to make a custom browser working with ARKit in background. I set UINavigationController as rootViewController and ... . And home indicator does not occupy any area....

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

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3.2k views

1 answer

django - Serializing model data leads to TypeError "Object of type ListSerializer is not JSON serializable"

I am not able to use the answers here or here for my own problem. I tried to customize the DRF ... Exception Value: Object of type ListSerializer is not JSON serializable...

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

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1.9k views

1 answer

如何指定用windows terminal打开bat

双击bat默认用cmd运行,样式太丑了,而且还乱码. 想换成WT运行,不想改注册表. 右键没有发现打开方式选项...

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

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1.8k views

1 answer

How to make a fast continuous stream of data with socket on Python?

I am writing a code where an arduino reads data from an accelerometer, passes it to a python script and then that ... ? Do I need to create multiple threads for recieving data?...

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

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2.2k views

1 answer

如何将多个jar包打包成一个maven依赖？

接入第三方服务的时候，第三方提供了许多的jar包，现在是想把这些jar包打包成一个maven依赖，上传到仓库中在项目中使用时直接在pom文件中写依赖就行请问这种要怎么操作呢，自己尝试了下面的操作，发现并不成 ... mvn install -DskipTests 打包，检查本地仓库是否有新依赖在项目加入依赖坐标，发现无法使用打包好的jar中的类 ...

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

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2.9k views

1 answer

model - Want to develop a Local search engine

I am part of building a local search engine from the scratch, alike as yahoo and bing etc.I would ... free local search engine website along with its documentation process....

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

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3.2k views

1 answer

babel报错

这个是什么问题呢，这个是我的babelrc配置这个是我的package.json配置，现在他总是报错React未定义，是因为我安装那个babel-preset-react的原因吗？如果是的话，该怎么处理呢...

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

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3.5k views

1 answer

关于el-dropdown-menu的样式问题？

这种情况网站刚打开的情况下出现，再刷新就没有了，不知道是不是我写法有问题...

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

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3.6k views

1 answer

Windows 环境命令行怎么使【*】以字符串类型传入可执行程序

...

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

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3.7k views

1 answer

vue-i18n国际化如何将返回的数据做成可改变语言?

1,select下拉框的内容（这里下拉框是请求接口拿的数据） 2，表格的内容...

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

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3.7k views

1 answer

thinkphp小程序申请退款，证书放网站外的目录使用绝对路径报错No required SSL certificate

thinkphp小程序申请退款，如果证书放网站外的目录，例如证书放在服务器根目录下/cert/cert.pem，使用绝对路径/cert/cert.pem， curl_setopt($ch,CURLOPT_SSLCERT,'/cert/cert.pem'); 会报错No ... 似乎这样不安全问：我想把证书放在网站外的目录，应该怎么操作？问题出在哪？...

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

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3.9k views

1 answer

跨域上传文件

两个web服务器，一个用来上传文件，一个接收文件在 chrome 中本地环境下配置好 CORS 是没有问题的但是到了线上，两个不同的域名，在上传文件时有些文件类型可以上传比如 txt文件 png图片，但是有些文件上传不了， ... 配置了 accept 也是不行不知道与 Nginx 有没有关系，这是 Nginx 配置：不知道该怎么解决，困扰了两天 ?...

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

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3.7k views

1 answer

javascript - When I run a script it tells me that filter is not a function. [Discord.js]

I have a script where you need to answer to the bot with yes (da in the script) or no (nu in the script) ... handled will terminate the Node.js process with a non-zero exit code....

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

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3.9k views

1 answer

vue display:none,@click @change失效有啥办法解决吗

外层的dom设置了display：none，里面的的插值{{XXX}}都没问题，但是@click @change 都是失效了，请问这是什么问题，感谢，有其他思路解决吗 <div class="tt" style=" ... /form> <a class="sub-tt" @click="submitAfterForm()">下一步</a> </div>...

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

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4.2k views

1 answer

docker build node老是报错

之前好好的，现在每次构建都报错，使过用cnpm，不过也一样 ERROR: Service 'web' failed to build : The command '/bin/sh -c npm install' returned a non-zero code: 1...

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

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3.9k views

1 answer

为什么很多源码库创建class还是喜欢用function的形式

比如说axios,或者之前看的events 都是用function的方式来实现类因为我是最近1，2年才接触的js,所以喜欢用es6的class方式来实现感觉更加的清晰和简洁。。。...

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

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3.8k views

1 answer

有没有vue的store模式的demo呢？

有没有vue的store模式的demo呢？官网的例子看不懂： https://cn.vuejs.org/v2/guide......

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

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4.3k views

1 answer

@AutoConfigurationPackage和@ComponentScan的作用有什么区别？

是关于@SpringBootApplication注解的一点疑惑，该注解的大致构成如下：其中@ComponentScan都知道是用于扫描主启动类路径及其子路径下的类，而@EnableAutoConfiguration中又有两 ... 但这件事不是@ComponentScan干的吗？难道@SpringBootApplication中这两个注解干的是同一件事？...

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

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4.0k views

1 answer

请问一下大佬们关于 volatile 的疑问？

public class VolatileDemo { Integer o = 0; boolean hasNew = false; public void put(int a){ while (hasNew == true){ } o = a; hasNew = ... 的不同线程执行顺序以及加了 volatile 的不同线程执行顺序嘛？感谢各位！...

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

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4.0k views

1 answer

controller.log是否可以删除?

docker容器配置的一个代理节点,两个数据节点. 在controller/log下面每天都有几个1.1G的log文件. 1.这个文件是干嘛的? 2.这个文件是在哪里设置,导致其出现的,以前不记得有这个 3.删了有影响么?...

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

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3.8k views

1 answer

nginx做前端服务器，上传到里面的图片无法显示

#user nobody; worker_processes 1; #error_log logs/error.log; #error_log logs/error.log notice; #error_log logs/error.log info; #pid logs/nginx.pid; ... 这张是上传到服务器的图片，显示不出来，路径是正确的...

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

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4.2k views

1 answer

dart - How to use lowerbound in flutter?

I see that there's a package in flutter that would let me use binarySearch and lowerBound https://api.flutter.dev/flutter/ ... Any ideas on why I'm not able to using lowerBound ?...

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

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