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Recent questions in Technique[技术]
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为什么react的组件要super
为什么react的组件要supe...
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Jan 27, 2021
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高亮不同项,隐藏相同项,商品详情对比,京东商品对比的那种,有没有人会呢
...
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sql - I'm trying to Calculate the amount to be charged for each assignment. Using Oracle DBMS
I have this so far but stuck..... SELECT a.Total_Assignment_Hrs, a.Assignment_Cost_Per_Day SUM (Total_Assignment_Hrs-Assignment_Cost_Per_Day) AS Assignment_Cost FROM Projects p, ... statement in how do extend it to show what i need ?....
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在这能有机会得到一个前端大师成为我的mentor吗
没有具体的问题. 之前学习过Vue,能写一些页面了. 因目前在学习React,因项目时间紧.想快速学习进入状态. 但是有一些概念性问题 或者逻辑的理解不是到位. 如果每个问题拿出来问问题,又显得太琐碎. 同时对前端这些还是挺感兴趣的.所以未来还有不少问题和困难. 希望在这能找一位mentor. 可能你的三言二语就能帮助我尽快入门. 哪位兄弟姐妹可以帮忙吗?...
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python - popen is not executing the command line parameters
I am trying to execute the following command via popen but not sure why it is not working and not error message thrown too. import os class Pabot(): def ... ) works fine in commandline. Any idea why popen does not function in this case?...
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Jan 27, 2021
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TP5的thinkphp文件夹只能浏览,不能调用
请各位大神帮我看看这是怎么搞的。刚下的tp5框架,thinkphp 5.0.24,复制到根目录新建几个空的文件夹,框架里面那个thinkphp文件夹在sublime里面就灰掉了,只能浏览但是不能调用。求解? ps:换了一个版本5.0.22依然是同样的问题,tp3.2.3就没事。...
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Jan 27, 2021
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我想要修改viewer自带的工具栏按钮的图标?修改的代码写在哪个文件里?three.js?viewer3D.js?
上面的icon我想改变一下 具体代码怎么写?写在哪个文件里?希望大神指导一下...
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Jan 27, 2021
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javascript - Vue.js, emit multiple parameters from child to parent
I am trying to emit multiple parameters from child to parents.What is the best way to do it. Child getUpdated(value, type) { if (type === 'students') { this. ... !== undefined || programs.length > 1) { this.programs = programs; } },...
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dart - How to add event listener and remove it into InputCodeControl in flutter?
I want to add listener and remove in dispose method to prevent memory leaks in my app. I am trying to add listener which will be fired when code_field is filled. What ways are ... Colors.black, fontSize: 30)), ), ], ), ), ), ); } }...
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关于 import export 循环依赖的问题
关于 ES6 Module 的循环依赖机制有个小问题,关于 export default 的 //a.mjs import bar from './b.mjs'; function foo(invoker) { console.log(invoker + ' invokes foo.js'); bar('foo.js'); } foo('index.js'); ... 一个解答,感谢 我其他的关于循环依赖的一些问题都写在了 循环加载 一文中,有兴趣的朋友欢迎交流一下 ...
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Tomcat doesnot redirect to custom error page
Catalina logs shows WARNING [main] org.apache.tomcat.util.digester.SetPropertiesRule.begin [SetPropertiesRule] {Server/Service/Engine/Host/Valve} Setting property 'errorCode. ... a matching property. Is there any way to solve this issue?...
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Tomcat
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jquery - WordPress - edit label in Comments section?
Is it possible to edit the 'Comment' label in the Comments section at all to some wording of my choice? Maybe with CSS? Many thanks,...
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Jan 27, 2021
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bluetooth lowenergy - BlueNRG wrong header
I bought STEVAL-MKSBOX1V1 of ST and wanted to write my own library to create a BLE application. The BLE module on board is SPBTLE-1S which mounts BlueNRG-1, I ... with this module I would like to have a bit of consulting. Thanks in advance...
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bluetooth
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c# - System.BadImageFormatException - mismatch between versions
I am getting the following System.BadImageFormatException: 'Could not load file or assembly 'Flir.Atlas.Live, Version=2.0.14266.1000, Culture=neutral, ... x86)FLIR SystemsFLIR Atlas SDK 6inx64Flir.Atlas.Image.dll</HintPath> </Reference>...
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PHP的毫秒时间戳中的毫秒部分是几位?
基本环境 php ^7.3 mysql ^8.0 环境的意思是按较新的版本来说,不考虑旧版因素 因为MySQL中时间戳的格式是如下,所以在一般都是以如下格式进行存储 $date = new DateTime($value); $date = $date->format('Y-m-d H:i:s.u'); 请教时间戳里的毫秒部分应该 ... 更长的位数了吗? MySQL中最多提供6位的毫秒时间戳,相信已经足够了 如果考虑不同语言间的数据交换的时候,应该用几位的毫秒时间戳?...
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Jan 27, 2021
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three.js 三维模型整个场景数据如何存储到数据库
使用场景: 一个场景中可以动态加载10多个模型(或者更多),模型摆放到场景里,每个模型位置,大小,缩放都可以修改,修改完成后,保存整个场景 保存好的多个场景,可以根据场景id 来预览 目前存储整个场景的数据到MongoDB数据库里面,但是场景下的glb模型特别大,把所有的数据存储进入,导致数据库存储不进去 ,数据格式 ... 面,对文档数据大小几乎没有限制 有什么好的建议吗? 存储在什么数据库里面(关系 非关系数据库), 以什么数据格式来存储,读取数据来渲染场景没那么困难?...
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Jan 25, 2021
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html - PHP Comment system using File Writer
I found a code from my old projects and I want to use it in my new project. But its not really working. Its a comment system with file writer and reader ... ="required"></textarea> <input type="submit" value="Review" class="reviewBtn" />...
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Jan 25, 2021
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小程序按钮如何设置背景图?
各位老师好,在小程序中如何将下面的按钮背景填充成一张背景图呢?通过CSS添加background-image属性好像是无效的,请问应该如何正确设置呢? 白底状态 希望可以将红色区域填充为背景图 .wxml <view class="px-2 ... .view-between text { line-height: 137rpx; color: #333; font-weight: 700; font-size: 28rpx; margin-left: 24rpx; }...
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Jan 24, 2021
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When using pandas dataframe.to_csv(), with compression='zip', it creates a zip file with two archive files with the EXACT same name
I am trying to save OHLCV (stock pricing) data from a dataframe into a single zipped csv file as follows. My test data is ohlcvData.csv, which I read into a ... 't appear to be such a setting. Any help on this would be appreciated. Thanks....
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Jan 24, 2021
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When
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javascript - Convert BN to number
In truffle console I am executing the following statement, result = token.balanceOf(accounts[1]) This statement returns the following output. <BN: 8ac7230489e80000> ... : result.toNumber is not a function Help me to fix this thiis....
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Jan 24, 2021
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一个域名下为什么可以看到多个域下的cookie?
一个域名下为什么可以看到多个域下的cookie?这是什么机制?按理说,我在https://stackoverflow.com/下,应该只能看到domain为.stackoverflow.com的cookie,为什么我同时还能看到.google.com domian下的cookie。...
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Jan 24, 2021
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I'm stuck, i can't pass data from model with api Rest, into another activity
I don't know why it's says me that "java.lang.IndexOutOfBoundsException: Index: 0, Size: 0" I've been searching for this since 2 hours, and i ... class.java) //intent.putExtra("lolipop", users[position].toString()) startActivity(intent) }...
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Jan 24, 2021
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I'm
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vue-router刷新页面,query传参时参数的类型变了
问题描述 vue-router通过query传参,比如:?fromWork=true&extraType=1,传过去的fromWork是boolean型,extraType是number型,但是当刷新页面时,拿到的参数都变成了字符串,有没有很好的解决方式 解决方式 1、目前使用的就是拿到参数后进行类型转换了,但总感觉不是最好的方式...
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Jan 24, 2021
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el-collapse默认展开时,内部的父组件传值异常
<el-collapse class="collapse" v-model="notStarted" v-if="notStartedProjects.length != 0"> <el-collapse-item name="notStarted"> <template slot="title"> <div style="color: #ff3079;font-size: ... 是刚进画面时都显示不了 手动点击展开 Q:怎么让初始画面显示el-icon-warn呢?...
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react-native 如何本地离线创建通知栏消息?
类似友盟推送、极光推送, 但是需要的 JS层发送通知, 请问如何实现呢? 有这种轮子吗?...
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c - Problem organizing a data set chronologically
I'm here asking for your help, not because I have an error, but simply because of this solution that in my head seemed quite credible despite not ... ][clinicaSelecionada].minutosFim = temp.minutosFim; } } Thank you all in advance!...
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javascript - How do you determine bitsPerSecond for media recording?
Is there some formula like frames per second X resolution to determine the bitsPerSecond? I can't understand what values I'm supposed to be ... bits_per_second = 16777216 } if (current_camera_height > 1000){ bits_per_second = 7500000 }...
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javascript - graying out a checkboxes after slecting multiple options and clicking submit
I have a multiple checkboxes making up a list. I want a user to be able to select as many as they wish, to click a submit button after filling in ... is the best option or is there another easier / more efficient way? Thanks in advance...
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Jan 24, 2021
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