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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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swift的switch句式里case里不能附带布尔类型的值了吗？

只要把布尔类型加到switch case里面就报错了，其他类型使用case .type(let value)都是正常的，就括号里包含布尔类型的时候报错了。给了'_' can only appear in a pattern or on the left side of an assignment的报错信息，有谁知道这个是什么情况吗？还有这个现在要怎么写？...

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

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仿百度网盘小程序多级目录右滑返回上级目录有实现思路吗?

百度网盘小程序多级目录右滑返回上级目录效果好难做啊...

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

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takesscreenshot - Cucumber: scenario outline need to take screenshot on failed step

I would like to take screenshot for failed step of each example input when I am using Scenario Outline. Example: ... screenshots to attach in report. could you pls help here....

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

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vue项目实现如下拓扑图，应该使用什么方法实现？

...

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

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子元素旋转90度，如何正常的撑开父元素（高宽对应）

如题，正常撑开，而不是子元素的宽撑开了父元素的高...

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

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echarts报错'getAttribute' of undefined

$nextTick setTimeout destroyed()这些能用的都用了，还是不管用，依旧报错之前是这样子的但是他刷新会有问题就改了外层样式，使用百分比，再把echarts放进去就开始报错了 ... () { myChart2.resize(); }); myChart2.setOption({ // options }); }, }...

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

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rxjs 单位时间内只执行一次，这个怎么弄呢？

比如我有组件相互独立，但是都有一个共同的请求，怎么做到在指定时间内只请求一次，比如3秒中内。不是只请求一次，只是在当前三秒内只执行一次，因为get的数据可能会变...

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

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vue预渲染prerender-spa-plugin+vue-meta 首页登录页无法获得css,js,图片等静态资源

prerender-spa-plugin+vue-meta 配置了一个项目想对首页登录页进行预加载但是打包之后访问不到任何的js css 图片资源 vue.config.js configureWebpack: config => { if ( ... -event')) } }).$mount('#app'); 请教一下该如何修改才能获取到静态资源...

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

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npm run build打包vue项目报错UnhandledPromiseRejectionWarning

npm run build打包vue项目报错UnhandledPromiseRejectionWarning: Error: ????????????·???? 网上查了很多，几乎都是抄来抄去的答案，解决不了问题……求助求助!...

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

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SpringSecurity 自动注入dao出现 NPE如何解决？

### 问题描述如题：SpringSecurity 自动注入dao出现 NPE，经过大量查找资料后意识到问题的原因为SpringSecurity是基于filter，而filter的初始化在自动bean初始化之前，所以 ... https://blog.csdn.net/ycf9212... https://blog.csdn.net/u013062......

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

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hadoop - List contents of zip file on HDFS

I have (huge) zip files (not gzip) sitting on HDFS. These files all contain multiple files. Is there any way, other ... list the files in the zip file? Like zipinfo does on Linux....

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

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element el-table表格以树形结构显示时，展开折叠卡顿特别严重

项目中用到了 table 组件，以树形结构展示，数据大概1000条（包含子节点），在展开或者折叠的时候特别卡，几乎无法使用。请问怎么处理好！谢谢！！！...

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

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python - What is the easiest way to check if a city name belongs to a given country?

I have two lists of city and country names, and I would like to check which city belong to which country. What is the ... 'Alliance', 'Progreso', 'NewYork', 'Toronto', ...]...

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

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此句sql,如何添加索引

主表中的where条件加了组合索引,但还是出现了:using temporary, using filesort 请教各位大神,如何优化谢谢！ EXPLAIN SELECT DISTINCT (store_id), c.id, ... ) AND store_id NOT IN ( 1, 2, ) ORDER BY id DESC LIMIT 1000...

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

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5.0k views

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error Missing list of packages to add to your project

Try to implement icon on react native i had "error Missing list of packages to add to your project." I checked my package json and ... 1" }, "jest": { "preset": "react-native" } }...

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

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4.0k views

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我在登录页面引用同一个组件分别实现输入账号和密码的功能，点击提交怎么获取值？

我在登录页面引用同一个组件LoginInput分别实现输入账号和密码的功能，当我点击登录按钮时，怎么分别从input里面获取输入的用户和密码 login.vue <template> < ... } } </script> <style scoped> @import './assets/styles/login_input.css'; </style>...

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

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c# - .Net5 FocusAsync() not compiling

I am new to and playing with MS Blazor on the new .Net5 framework. I am attempting to set the focus of a text ... ' does not exist in the current context. Any help is appreciated....

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

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3.6k views

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请问如下为什么div会把margin伸出到header之外

请问如下为什么div会把margin伸出到header之外，如何，让他向上的margin在header内，就是从margin的border算起？ <!DOCTYPE html> <html lang="en"> <head> <meta ... style="margin:5vh">通讯正常</div> </header> </body> </html>...

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

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3.9k views

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关于Bringing-Old-Photos-Back-to-Life项目报错

https://github.com/microsoft/... 微软开源项目，安装完依赖运行不了，不知道哪里有问题，求大神指导...

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

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3.6k views

1 answer

vue登录页面登陆两次问题 /?#

vue登录页面登陆两次问题 /? 1.启动服务后，跳转 [http://192.168.0.108:8080/] 2.然后输入正确的用户名和密码 ![第1,2步](/img/bVcHQZ9) ... : pointer; } .s-canvas canvas { margin-top: 1px; margin-left: 8px; } </style>...

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

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3.8k views

1 answer

javascript - Converting MooTools to a jQuery script

I was wondering how I can convert this script right below: > window.addEvent('domready', function(){ var dropdowns = ... MooTools at the same time. Any help would be appreciated!...

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

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3.8k views

1 answer

小程序正式环境和测试环境域名

开发小程序的时候，给测试人员测试的方式是：提交到微信上面，然后扫描体验版小程序进行测试。测试连接的域名是http的，之前一直都可以。但是在公众号小程序后台那里配置了request的合法域名时候，https来的，属于线上环境。测试环境那个域名就一直连不上了。不知道是不是配置这个有影响。求指导。。。。。...

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

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3.6k views

1 answer

testng.xml - How to run Testng Xml Suites multiple times and stop running if any failures on First Iteration

I want to run testNg Suites N times and on each iteration, if any test fails i need to stop the run and list the failures. Can some one please help me ?...

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

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4.0k views

1 answer

How to integrate offline folium map onto django using maptiler server?

I am new to Django and I have installed mapTiler server on my mac to use it as as map server. I have a django app that ... .com/9eRWH.png [2]: https://i.stack.imgur.com/P0Sp4.png...

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

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3.2k views

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How to solve the exception logging problem which I have in Java?

I have used logger object and add file handler to log the exceptions in a log file of a Java project. It ... in the location I specify rather than logging in the console...

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

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3.7k views

1 answer

reactjs - Blank screen with expo locations and perns

I am trying to implement location services that give the leaflet map the coords of the user after they agree to the permissions. While I ... {x}/{y}.png" /> </MapContainer> ); } }...

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

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2.1k views

1 answer

请问为什么上面的可以分别打印出不一样的，可以下面的两次结果都一样？下面的第一次不是应该是[{a:0}]

b=[] for(i=0;i<2;i++){ b.push(i) console.log(b) } //[0] [0,1] b=[{},{}] for(i=0;i<2;i++){ b[i].a=i console.log(b) } //[{a:0},{a:1}] [{a:0},{a:1}]...

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

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