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    词法作用域意味着作用域是由书写代码时函数声明的位置决定的 那么 var value = 1; function foo() { console.log(value); } function bar() { var value = 2; foo(); } bar(); // 1 这种情况是 1 function ... (); } bar(); //undefined var value = 1; 这种情况就输出为 undefined 啊 这个不是和函数调用位置无关么?...
asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    I am working on a camera app. I am using camera 2 API and my camera preview is rendered by onDraw() of SurfaceView, (took help from here), ... to AgoraVideoFrame. Basically I have to transmit, this preview to other device. Any suggestions?...
asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    我用vuecli4搭建的项目,没有vue.config.js请问vue.config.js和babel.config.js是一个东西吗?作用一样吗?...
asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    I can't save a Timestamp object in Firebase Firestore using Flutter Web, with Android or iOS it works normally Already tried: FieldValue.serverTimestamp() DateTime ... /dart_sdk.js:164070:16 at http://localhost:62147/dart_sdk.js:163778:11...
asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    如图代码,选中一起执行,第一次执行时只运行了if部分,未执行else部分. 重新执行一次,就都执行了,什么原因?...
asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)
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245 views
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    I'm trying to place a div above InfoWindow component from google-maps-react. I tried my code below but the InfoWindow isn't appearing : <div> <div className={styles. ... >city</p> </div> </InfoWindow> </div> .superdiv{ position: relative; }...
asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    I am doing a parameter variation experiment with 1000 replications for each iteration. For each of these model runs, I want to store a copy of a dataset that ... experiment is also 16gb Is there a way to more efficiently export this data?...
asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    scheduleJob设置定时任务要求scheduleTime是一个MINUTE类型的标量/向量,我想要每10s读一个文件里的数据,怎么做定时任务....
asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    pc做微博分享,链接提示 如需浏览,请长按网址复制后使用浏览器访问 生成的链接 http://t.cn/Rp7YRQG?u=5262293......
asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    尝试clipboard.js 也尝试了以下方案 const selection = window.getSelection(); const range = document.createRange(); range.selectNodeContents(element); selection.removeAllRanges(); selection.addRange(range); 都没有办法 ... 过js放到剪切板粘贴到微信,求哪位大神做过类似需求,是否有解决方案,多谢...
asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    请问这个电商图片切换模块怎么做的啊?有没有demo呢? 我是个小白js比较差 如图:...
asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)
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614 views
1 answer
    I'm currently writing my own game engine with GStreamer for media and Skia (Vulkan) for graphics. Is there a way I can turn video frames from GStreamer to ... a signal from GStreamer through fakesink. Not sure if that's of any help....
asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)
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1 answer
    I was wondering if anyone knew if it was possible to use a full text index with entity framework without having to call a stored procedure. I couldnt ... anyone know of any nuget packages that provide this functionality if it doesnt exist?...
asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)
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569 views
1 answer
    I'm trying to process some UDP packages. Opening sockets and so on works well, I do get packages and I get the source IP and port.The port is set in m_port ... 1) //there is data { processOutput(buf, recv_len, from, (socklen_t)flen); } }...
asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)
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617 views
1 answer
    I'm working on a MERN app, pretty much done, all I have left to do is deploy it. The app works perfectly when I run it locally, but I deploy to Heroku, I ... .log(`Error: ${err.message}`.red) process.exit(1) } } module.exports = connectDB...
asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)
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1 answer
    图片需从后端(nodejs开发的后台服务)的接口经过查询后才返回,前端(vue)该如何动态的展示这个图片 目前是采用静态资源的形式,但是感觉这样不太严谨 img.src = 'http://localhost:9000/public/images/'+this.data.stuFile...
asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)
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853 views
1 answer
    im currently running a query in presto db which has a condition like below: x.created_date > date_add('day',-15,y.arrival_timestamp ) I plan to move the ... sample value 2020-11-24T21:08:20.046000 Any help would be appreciated.Thank you...
asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    I am using javax.persistence.criteria.CriteriaBuilder and I am having trouble using the persistence API to do this simple (oracle) SQL: SELECT * FROM foo ... anyway other way I can supply hibernate the inline literal for this function?...
asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)
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553 views
1 answer
    I've recently found the Google closure compiler, and it seems very good at what it does. That being said I'm running into issues when using multiple ... thus overwriting the references and functions of the first. If there was some way...
asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)
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810 views
1 answer
    Hey everyone i have script that works parallel, i was using APScheduler for scheduling the tasks but it works synchron (BlockingScheduler,BackgroundScheduler) doesnt ... 'interval', seconds=1,id='first_job',max_instances=1) sched.start()...
asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)
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1 answer
    页面和需求 从后端返回的地址后缀判断如果为视频就播放,现在使用的是video-player插件,问题:每一次刷新页面第一次永远都是加载不出来视频,子组件也没有收到父组件传过去的url,但是播放下一个视频是可以的,然后再返回上一个视频就可以了。 我的代码: 父组件: 子组件:...
asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    a=new Promise(()=>setTimeout(function(){console.log("123")},3000)) a.then(()=>console.log('321'))...
asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    I am writing a program to detect crop rows in uav imagery and I have successfully managed to detect crop rows in cropped sections of the image using opencv and python, ... the just the end of the row. Any Ideas on how this might be done?...
asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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641 views
1 answer
    The problem is when this valid moves function runs and goes through the 2 tuples it only ever appends the second tuple when both of the tuples ... , end_x, end_y) board.print_board() board.draw_board(screen) board.draw_checkers(screen)...
asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    当用户选择开始的时间后,在结束时间中,开始的时间不能被选中.这样也行....
asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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1 answer
    I seem to have a problem when updating my Dataframe table using this Table.update(other) 'Table' and 'other' have the exact same column labels. ... ] Column4 float64 Column5 datetime64[ns] Column6 datetime64[ns] Column7 object dtype: object...
asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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706 views
1 answer
    请问 Typescript 语言中 如果一个函数的返回值有多种的话 /// 比如: declare function foo(p : boolean) : number | string; 要如何根据参数 p 确定返回值类型? /// 就是,达到如下效果: declare function foo(p ... .querySelector 函数的定义 有所不同的是 document.querySelector 的参数是 字符串 类型的 这里想实现的 是 布尔 类型的...
asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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1 answer
    I'm navigate to purchasing list Page it is going fine. But i received error Undefined variable: openInvoice. in my controller code. What is ... Message: Undefined variable: openInvoice Filename: purchase/purchase_list.php Line Number: 31...
asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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