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R error in fPortfolio package: could not find function "tclVar"

I load fPortfolio with a pre-installed data frame attached: library(fPortfolio) library(PerformanceAnalytics) ... the tcltk2 packages. fPortfolio rdocumentation fPortfolio github...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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spring boot - Error in pom.xml: Element docker is not allowed here

Following this question and these instructions, I get the error in pom: Element docker is not allowed here. EDIT: The ... > </publishRegistry> </docker> </configuration> </plugin>...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Always receiving null list from room table

I have have room table with some values. I want to sum some of that values, but I am ... reference at com.example.moneymanager.MainActivity2.otherArraySum(MainActivity2.java:155)...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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vuejs 2.x 如何制作窗帘开关暂停的动画

vuejs 2.x 如何制作窗帘开关暂停的动画...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - "Request header field mode is not allowed by Access-Control-Allow-Headers in preflight response" how to solve problem with Apollo?

When i make simple fetch request with gql it works fine, but when I try to make it with apollo client it ... : undefined, }); return client; }; export default createApolloClient;...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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vue 数据初始化的问题

比如： <el-option v-for="(v,k) in db_api_data.table_fields[form.public_data.master_table_name].data" :label="v.Field" :value="v.Field"> </el-option> ... 初始化导致代码已经很臃肿不知道你们是如何处理这些问题的 ...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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有关webuploader的问题

现在我的页面引入了webuploader插件，来做个图片上传的网页，但是想让用户在提交图片数据时，附带提供图片的标题和描述（一个新表单），这个有个怎么实现呢...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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winforms - C# form doesn't size properly

I'm doing a simple c# Windows Form project, and I found a problem in sizing my form. If the form is smaller than ... and watch my form just with the original size of c# editor?...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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jquery trigger

<html> <head> <script type="text/javascript" src="/jquery/jquery.js"></script> <script type="text/javascript"> $(document).ready(function(){ $ ... > </html> 这个为什么点击按钮执行三次，手动选中就执行一次...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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android - Firebase reportind ad_impression and ad_click

I've created a mobile app in Flutter. I've successfully developed it on iOS and Android. Both of the versions are ... , Android reports it automatically, why iOS doesn't do it?...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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cmder如何切换到指定目录？

cmder 切换到指定目录打开cmder默认是 C: ，但我想切换到 D:myworkstation 该用什么命令？...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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关于angularjs中directive中scope只在页面加载时运行的问题

在controller中有一个ngclick的函数定义，在定义函数中设置$scope.xx的值，并最后执行$scope.$apply();但是对应的directive的link中alert(JSON.stringify($scope.data) ... ="performance-radar" data="data"></radar> 真的很困惑，求帮助~...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Laravel 8 Multi Auth with Jetstream livewire

im trying to setup a multi auth system in laravel 8 with jetstream livewire in my ecomm project (one ... AppGuardsAdminStatefulGuard.php following that tutorial but never used it....

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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vue迁移到webpack2, 'style-loader' instead of 'style'.

vue迁移到webpack2,已按迁移文档编写配置如下我的配置： webpackConfig.module = { rules : [ { test: /.css$/, use: ExtractTextPlugin.extract({ fallback: ... of 'style'. @ ./app.js 5:0-45 @ multi ./app.js...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c# - ASP.NET Core MVC filtering: How can I send multiple value to action?

I want to filter products in my e-commerce project, but I have a problem: I want my filtering to change dynamically, I choose a brand ... "@memory"/> </div> } </form> </div> </div>...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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vue组件中props有什么作用

<div id="app"> <ul> <todo-item v-for= "item in groceryList" v-bind:todo="item"></todo-item> </ul> </div> Vue.component(' ... {text:'shucai'}, {text:'nairao'}, {text:'else'} ] } })...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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input框怎么设置onKeypress事件只能输入数字，能兼容火狐，IE9的

input框怎么设置onKeypress事件只能输入数字，能兼容火狐，IE9的...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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如何在浏览器直接打开word excel ppt等这些office的文件

请求一下各位大神，比如我把连接放在a标签里面，本来是点一下就是下载的，但是由于比较麻烦，并且会产生很多垃圾文件，所以想通过浏览器直接打开该文件，现在一些图片比如jpg，png和pdf，txt等这些文件是可以直接在浏览器打开的， ... word Excel ppt等这些文件还是没办法直接通过浏览器直接浏览，请问一下有什么办法可以解决后台用的是php ，...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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用react写完了页面，怎么打包成app？

现在我是用react写完了页面，也已经用webpack打包出来了，也已经放到服务器上正常运行了，so far so good. 那么如果我想把这个开发完的页面弄成安卓的app或者苹果的app，有什么软件可以打包或者什么方法打包？性能方面怎么样？真的 ... 学者来说最缺的就是实际的工作场景，相信很多人也有跟我一样的疑惑~~ 大神来答，拯救一下我们这些小白~~...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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在Yii2 中使用 mailer 组件发邮件群发问题

使用的是Yii2 自带的mailer 组件配置的 swiftmailer 第一次发送是OK的，当同一实例第二次使用的时候有各种异常，感觉是这个实例只能使用一次的样子。如图何解？我想每次都强制 mailer组件重新实例化，别单例，看了DI部分的代码，没有找到参数，记得是可以的。有没有人知道啊...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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predis包和phpredis扩展的区别是什么

predis好神奇啊，居然不用扩展就可以直接连接redis，他底层是用什么实现的？（我看了一下他的源代码，根本看不懂啊），听说phpredis是扩展实现所以性能比predis更高吗？但是Laravel官方却推荐的是predis，请问一下他们之间的区别是什么？性能差距大不大？...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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node.js - Stub not working when writing unit test in Node using Express

Alright, so I have a very simple API that basically returns information on currencies. I am trying to use the clean code ... anyone know how to make this work? Thank you so much...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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我的事件被重复触发了么? 如何销毁？

如图，在控制台中看到了“resize”这个事件被重复调用了这么多次，好像没有一直被销毁！然后看这里的源代码，源码销毁事件成功执行了吗？为何会有这么多的事件被重复调用呢...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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wordpress - Link preview not shown on any soacial media

I was testing to see how my links appear when it's shared on whatsapp or other social media, I found that it only ... wordpress version btw and Yoast SEO plugin. How to fix it?...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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uwp - How to change font icon of ToggleButton with VisualState in Template?

I have a ToggleButton in my XAML page : <ToggleButton Content="" IsChecked="True" FontFamily="Segoe MDL2 Assets" / ... code depends on the state (like Content="") ?...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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html - How to control transition without moving flexbox?

When I toggle the left sidebar, the size of the right sidebar changes a little. How do I stop that from happening? I'm ... class="flex-footer"> FOOTER </footer> </body> </html>...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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HTML5 video怎么充满div？

使用video发现由于视频的分辨率（或者说是比率）与父盒子的宽高比不一样，导致视频不能充满父盒子。（父盒子宽高不是死的，可能根据横竖屏变化） android4.4.4以上可使用css样式解决 object-fit:fill;可是以下无效！...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java报错Communications link failure 该如何解决？

就是普通的查询mysql数据库的代码：错误栈如下： com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure The ... mysql.jdbc.MysqlIO.readPacket(MysqlIO.java:599) ... 15 more...

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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