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微信小程序wx.canvasToTempFilePath方法为什么使用本地图片就可以显示，网络图片就不可以

效果如下代码如下 wx.canvasToTempFilePath部分...

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

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js for循环

想用for循环优化下面的写法 if (dataNode.level === 2) { dataNode.parent.data.disabled = false } if (dataNode.level ... .disabled = false dataNode.parent.parent.parent.data.disabled = false }...

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

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postgresql - Is there any (preferred) way to separate search logic from output contents when getting json from Postgres?

I have a Postgres (12) datastore that is storing RDBS (rows & columns) data in order to serve a client that is ... looking around, I haven't come up with a good solution....

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

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想问一个关于java8线程安全的问题

写了一个卖票的例子用synchronized结果每次是一个线程的名字在输出，虽然线程有随机性，但也不会每次都抢到吧这是为什么呀 public class MyRunnable implements Runnable { ... myRunnable,"窗口3"); t1.start(); t2.start(); t3.start(); } }...

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

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angularjs - big data with angular ui-grid (feature grouping selection)

here's my demo plunker: http://plnkr.co/edit/Oqd1WHow01ssu43e I'm trying to improve the performance of grid for ... header to select hundreds children rows? Thank in advance:)...

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

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typescript - Error: "Router must be defined in href" stenciljs router-v2 testing

I am trying to test a stencil component. I use "stencil-router-v2". I have a link in my component's render ... a (node_modules/@stencil/core/internal/testing/index.js:25:17)```...

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

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EF Core 3.1 - preserving orderby when concatenating two queries

I'm using EF Core to search my table for records which match a specified filter and to list the matches in ... without an expensive intermediate ToList() / AsEnumerable() call?...

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

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当点击过某个元素后,再按空格的时候就会默认触发点击那个元素的事件,请问这是什么原因？js有什么解决办法嘛？

碰到一个现象，先是鼠标点击了一个按钮，触发了它的点击事件，这时，鼠标不动，依然在该按钮上，按下空格键，发现触发了这个按钮的点击事件，请问，这是什么原因？想实现，按下空格键，不去触发这个按钮的点击事件，js有什么办法嘛？...

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

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395 views

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Maven配置多仓时下载jar的策略问题

如下，maven配置了多个仓：repo1,repo2，假设要下载一个snapshot版本的jar包A，是同时会从repo1和repo2检查下载？选一个最新的吗？要是release版本呢？我 ... <snapshots> <enabled>false</enabled> </snapshots> <repository/> </repositories>...

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

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Vue使用$emit 报警告[Violation] 'click' handler took 1861ms

事发代码： `<van-tag @click="$emit('_click', tag, idx)"`> `</van-tag> 警告信息：浏览器是chromium套壳的EDGE 跟方法名应该无关，我换成什么都报，写一个方法来$emit也会报...

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

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运行react-native run-android报错Failed to parse React Native CLI ?

请问下，我搭建好RN环境，运行react-native run-android报错： FAILURE: Build failed with an exception. * Where: Script 'D:myproject ... react-native react-native-cli' and try again 这种报错如何解决？...

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

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maven 由3.6.3改为3.5.4,为什么不生效？ubuntu 18.4

正确设置如下：注意执行 source /etc/profile后才生效环境变量配置 sudo gedit /etc/profile 文尾添加以下内容 #Maven环境变量，填写个人maven安装路径 export M2_HOME=/opt/apache- ... 路径下有，分别有maven 3.6.3 和 3.5.4，如下图：问题出在哪里？...

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

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java - Stateless ModalDialog in Wicket

How can I create a stateless ModalDialog using Wicket? I tried the following code, but it results in an error. The error doesn't occur when ... ****************************...

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

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python - iterating over column values and check for inside values

sorry, I am new to python. suppose, I have a data frame with column values repeating at some intervals dest_num ... .2 none 322 42.1 critical voltage 322 40.1 dest_outage...

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

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java - GraphQL server integration with Kafka

GraphQL server integration with Kafka Initially, I had created architecture/design like Request API Gateway-> Kafka Producer -> ... PROS and CONS Please reply as soon as possible....

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

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Yii 框架中如何通过模型完成字段写入和读取处理？

比如用户信息表，需要将昵称字段，base64 加密后保存，读取的时候再解密输出如何在模型中控制 ? 假如字段名为 nickname 在 thinkphp5 中，模型 setFieldAttr 和 getFieldAttr 两个方法 Yii 中怎么做？...

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

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hana sql script - Return only the first parameter from stored procedure

How can I make it possible to return only the first parameter from a stored procedure with multiple OUT-parameters? Overview of Parameters Position Parameter Type 1 OUT 2 OUT...

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

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Is Kafka global store visible from multiple instances of app

My question is - I have Kafka stream processing micro service which listens to multiple topics. Aggregates the state from ... I get sample code example on how to create one ?...

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

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vue打包上测试服务地址404，但是页面还可以显示

vue打包上测试服务地址404，但是页面还可以显示,但是本地没问题，请教大神咋解决？...

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

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atomikos最后提交阶段，事务A提交成功，事务B提交时数据库B宕机了。此时事务A会被回滚么

atomikos最后提交阶段，事务A提交成功，事务B提交时数据库B宕机了。此时事务A会被回滚么...

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

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370 views

1 answer

如何在JS中使用ts的类型校验

已有的项目是vue项目，用js写的，我想把接口文件写成ts，利用interface来规范参数，但是不起作用，传了别的类型也不会报错或者提示什么的希望在这里调用ts方法的时候，会检查参数类型但是没有效果，不管对不对都没啥效果...

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

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java - How can you join two union subqueries in QueryDSL?

I have a few subqueries like: (simplified) ListSubQuery<Long> getCustomerId () { return new SQLSubQuery.from(customer).list ... , saying the required type for join is EntityPath<?>...

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

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Is it possible to convert android/iOS app in cross platform app?

Is it possible to convert an android/iOS app in a cross platform app like react native or flutter? I had an app ... in android/iOS but I have skills in React Native and Flutter....

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

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301 views

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jQuery Show/Hide not working with Bootstrap 4

I am upgrading to Bootstrap 4 and noticed that all of our jQuery show/hide's are not working properly when using a hidden ... "hide">Hide</button> <button id="show">Show</button>...

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

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物联网，快速搜索局域网其他WIFI设备的思路

如题，请问怎么快速搜索当前局域网中的其他兼容的网络设备？我目前是首先获取本机IP（假设是192.168.0.100），然后循环遍历当前网段，192.168.0.1~192.168.0.255，发送255个请求，看看哪些请求有合法的回应，有什么简便的方法么？...

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

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iOS 中的静态库的作用是什么？

iOS 中的静态库的作用是什么？是不是把一个包的代码打包称为静态库，然后就看不见里面的代码了吗？是否是代码隐藏的作用？还有没有其他什么作用？...

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

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was8.5版本jdk1.6版本，项目能运行，运行时部分功能报sun.security.x509.X509Certimpl

短信发送功能报sun.security.x509.X509Certimpl 测试环境jdk1.5可以UATjdk1.6不行相关代码粘贴代码文本（请勿用截图）求大神们帮忙看看，采纳有偿。...

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

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180 views

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javascript - Express Server Handler "app" not defined in my handler.js file

question#2 from me so far...I'm trying to host my own express server on localhost:3000 in my server.js file. The ... name, email, password: hashedPassword }); ... module.exports;...

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

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