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node.js - nodejs cheerio returns undefined although it found a text

I want to search a Word and the Link. If it found, then I want to return the link. Everything works fine if I output it ... ; } }); }); return email_obj; } module.exports = email;...

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

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python - AttributeError: 'NoneType' object has no attribute 'get' while checking none data in list of dictionaries

i am trying to check null fields in dataframe but getting error while trying to compare. if data[D]['obj1']['obj2' ... check if that field is none and replace it with empty string....

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

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js文件下载速度慢的原因是什么？

服务器环境：阿里云ECS，8核16G，带宽10Mbps，nginx服务现象： vue打包好的js文件450kb左右，大约需要2s才能下载完，为什么这么慢呢？由于微信浏览器缓存太难清除的原因，暂时不考虑缓存js文件的方法。...

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

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vue cli4部署项目到gitee pages ,出现404，找不到资源

问题描述 vue cli4部署项目到gitee pages ,出现404，找不到资源问题出现的环境背景及自己尝试过哪些方法百度了一波，按照他们的说法，在vue.config.js配置文件中添加publicPath: './',我配置后，重新打包，依 ... } } 你期待的结果是什么？实际看到的错误信息又是什么？点击可以正常访问，实际错误信息是404，...

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

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vue实现带截图和分屏的功能 , 并且能播放rstp流视频

分屏功能类似网站的这个功能：http://nvr.liveqing.com:10800/#/screen 这个网站视频点击选择通道就可以选中视频播放而且视频为h5视频需要 ... || document.fullScreen || //谷歌浏览器及Webkit内核浏览器 document.webkitIsFullScreen ||...

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

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how to get values from table cell dynamically in javascript

This is my code and i am trying to get values by onclick form a table cells dynamically. let Table = document. ... console.log i am getting only the first value of table cell...

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

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element input框里动态的内容 tooltip怎样实现换行

<el-tooltip :content="formData.ruleForm.orgName" placement="top"> <el-input v-model="formData.ruleForm.orgName" placeholder="请输入机构名称" ... -input" ></el-input> </el-tooltip> 这是我写的代码...

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

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java - Many to one relation beetween 3 entities

In my springboot application I have these 3 entities : @Entity public class Process { @Id private Long Id; @ManyToOne( ... Could someone help me on this ? Many thanks in advance...

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

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在安卓微信里面一进入页面监听popstate事件，没有立即生效

最近在做一个微信的公众号项目，产品有个需求是在当前页面返回的时候返回到制定的页面，我是监听popstate事件，来判断，ios微信没有问题，安卓的没有办法立即生效，只有在你操作了一下页面后才会生效，请问有什么可以方法可以解决这个问题吗...

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

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How do I use C to launch a process in linux and write to that process STDIN and collect its STDOUT and STDERR?

I'm using C++ but obviously linux commands are in C I want to launch a process with a specific argv, write to its STDIN ... without it). What functions do I need to use to do this?...

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

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sql - CONCAT leading 0 in case statement

I found an error in a query I inherited from a previous coworker that I am trying to fix but it's a weird issue ... Why does it work outside of the CASE statement, but not within?...

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

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vue-cli3 使用深度选择器自定义修改element-ui样式失败

我引用了element的想调整弹出头的样式，在浏览器调试时可用直接通过修改.el-collapse-item__header来修改样式但是在我的vue中，即使我用了深度选择器也无效 ... >>> .el-collapse-item__header{ background-color: rgb(217, 237, 247) !important; }...

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

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在vert.x环境下使用基于阻塞jdbc的orm框架来访问数据库有什么大问题？

我使用vert.x 创建一个自定义的tcp服务端实例程序来处理tcp服务，其中编写的代码包括使用基于阻塞jdbc的orm框架来进行数据库访问在vert.x环境下使用基于阻塞jdbc的orm框架来访问数据库有什么大问题？ ** ... 目前使用的orm框架是tk.Mybatis，出于时间原因，目前现在不打算替换为vert.x的异步jdbc驱动组件(未来会换)...

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

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多个数组怎么转为树形结构并需要去重

例： ['动物-昆虫-蚂蚁', '动物-昆虫-蝴蝶', '植物-草-绿色', '植物-花-红色']` 想得到： [ { name:'动物'， children:[ {name:'昆虫' children：[ {name:'蚂蚁'}, {name:'蝴蝶'} ] } ] }， { 同上 } ]...

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

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node.js socket continous data stream

I have a node.js based server running on Raspberry that performs as relay between TCP clients and USB devices. Here what ... Is there a way to stream data intelligently ? Thanks M...

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

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javascript - how to Use Parse REST API to store an image to Parse with VueJs

Guys I have a problem with register an image to Parse Dashboard using Vue Js (REST API), really I'm confused and I don' ... 'Erreur de connexion', position: 'bottom-right' }) }) }...

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

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python - single positional indexer is out-of-bounds : Error

I am practicing working in dataframe in pandas.i came across an error for which i dont understand the reason why there ... ("hey") Error: single positional indexer is out-of-bounds...

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

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html - CSS: animation is not smooth

I have simple CS3 animation which is flipping three words vertically. Now my animation is not very smooth like you can see in my code. Is ... div></div> </div> </div> </span> </h1>...

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

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json里面能使用变量吗？

` // 例如json数据 json:{ data1:'xxxx', data2:'data1 + "yyy"' } ` 想表达的意思就是能能不能在json中使用内部变量？...

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

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Using symbols / special characters giving me error

I am using prettier extension, but I am getting "unexpected error" error when using special characters like (&#38) ... anyone knows how to solve this error. Regards, Shehzad Asif...

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

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python - 'Selector' object does not support item assignment

I've a problem with my data mining project at scrapy. I have this error message when I run my spider and ? really ... () return item What should ? do this situation please help me...

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

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135 views

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html - Javascript counter up with various setTimeout

I created from various sources the simplest js counter up I could find. How can I make different setTimeout for each counter so ... 2" data-value="0" data-target="2000">0</div>...

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

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lodash times 函数的一点疑问，bug or feature?

先上源码： const MAX_SAFE_INTEGER = 9007199254740991 const MAX_ARRAY_LENGTH = 4294967295 function times(n, iteratee) { if (n < 1 || n > ... 行额外的 iteratee 调用所以这样做的目的是为什么呢？...

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

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关于前端的样式问题

这个东西叫什么啊，不知道从哪里开始查，怎么做呢？...

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

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twig 模板子视图如何引入样式？

请问twig模板子视图如何单独引入样式？有实现方式吗？例如这是一个nav的子视图，希望在此视图内引入nav相关的css,而不是在引入该子视图的主视图上引入。似乎无法使用import直接引入。...

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

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在java中这个cursor 和chunk 是什么关系？

private long trunckCursor = -1; if (printState == printStateReadChuncked) { //数据分片处理 if (trunckCursor <= 0) { trunckCursor = headerSplitByte; ... 看到这个代码？一直不知道这个cursor 啥意思为啥这里是-1？...

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

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前端没有问号

前端没有问号...

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

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212 views

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react-native手势如何注册多个响应者？

<组件1> <组件2> </组件2> </组件1> 如何做到组件1能响应手势，同时组件2也能响应手势？或者说,组件1仅仅需要拿到手势的移动事件 https://reactnative.cn/docs/p......

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

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