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Recent questions in Technique[技术]
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c - Condition in 2D array is it true
Write on C You are located in front of a stone wall with steps (two dimesional array) and each step has its own value- random integer ... } x++; } printf("You won "); return 0; }...
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?Salt Server与Salt Master之间的关系是什么?
?Salt Server与Salt Master之间的关系是?...
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c# - NinjaTrader 8 recive command by lan
I try to create an indicator for ninjatrader 8, this indicator must open a port like a server and stay in LISTEN mode, a command ... catch { Print("SocketException: {0}"); } } } }...
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js字符转数字超过16位失真
项目处理input框输入20位长度的数字,parseInt/parseFloat/Number都试了,会出现失真的问题 请问有没有大佬有解决过类似问题,求分享...
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Jan 27, 2021
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jenkins - convert list of map String to List of map as object List in groovy
i have an String object and i want to convert to List . in this list are List of maps . String Object is : def listOfmap = [[ip ... 3 listOfmap[2] = 5 * * * * please help me . tnx...
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groovy - in java: How can i identify file extension/file type from file in binary data (BYTEA) with mime_type 'application/octet-stream' and save to disk?
From a database migration, we have a data-dump in a postgreSQL database. The task is to write a script in java or groovy in ... as e.g. pdf, docx, or png? Many thanks in advance!...
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如何修改 JS Object 数据结构?
我有一组原始数据,结构为: [{index: '1', title: '第1层'}, {index: '1-1', title: '第一层第1个'}, {index: '1-2', title: '第一层第2个'}, {index: ... .index).split('-'); // 得到数组结构,根据数组结构判断后追加 children // ... }...
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How to interact with Python's objects through GUI (GTK)?
For example, my program heavily relies on working with 2D numpy arrays, and I need to visualize it and consequently ... 's the alternative graphics library? Thank you in advance....
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Jan 27, 2021
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How
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113
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pow计算有误?
我在DolphinDB GUI中计算 pow(0.5,1/42) 得到1,但在python IDLE中计算 >>> 0.5 ** (1/42) 0.98363193244419...
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Jan 27, 2021
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mysql - UnhandledPromiseRejectionWarning: Error: Entity metadata for Category#products was not found
I looked at other issues that throw the same error, but none of then worked for me. I tried rename, ... (/home/guilherme/Documentos/Restore/node_modules/tslib/tslib.js:141:27)...
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Jan 27, 2021
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mysql
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322
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2020年推荐免费图床
请问大神有甚么推荐的免费图床吗? 或是每个月费一点费用的,预算每个月20$ (我很穷 T_T) 或是有推荐自架图床方式。 更新 : 请问 github 当图床建议吗? 担心被墙...
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245
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c++ - How can I copy a text from a sfml window?
I've got this sfml window that displays a text and now I want to make it markable so that you can copy the text. Any ideas how to do that?...
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Jan 27, 2021
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c++
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616
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移动端网页播放器非全屏以及全屏时如何屏蔽浏览器默认的按钮和样式?
在移动端设备中,自己写的网页播放器按钮样式,往往会被各种浏览器默认的按钮和样式所覆盖,各种浏览器所呈现的按钮、样式,甚至功能都有所不同,如何防止浏览器的覆盖,以此达成自定义播放器按钮、样式、功能? 我发现虎牙直播的 wap 端的播放器是不会被浏览器自带的播放器样式所覆盖,是用了什么魔法吗?...
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Jan 27, 2021
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128
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javascript - Jest export syntax error when running tests
I have the following simple test: describe("BlogLayout", () => { it("should render correctly", () => { const ... a js file) is where export const letterSpacingMap = { comes from....
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Jan 27, 2021
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javascript
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786
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r - Reorder rows according to two column values in geom_tile() heatmap
library(tidyverse) df <- data.frame(country = c("USA", "USA", "USA", "UK", "UK", "UK", "Japan", "Japan", ... have the same values) 4th row: Norway 5th row: Germany 6th row: Japan...
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Jan 27, 2021
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291
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上亿用户登录数据计算留存
现状是将用户的登录数据记录到一个mysql单表如下: CREATE TABLE `user_retention_stats` ( `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT, `login_date` date NOT NULL ... 否有替代单表mysql的方案,可以供海量登录数据准实时计算留存使用?...
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Jan 27, 2021
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votes
376
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下拉框将标题固定在下拉框内
前面是固定不动的 后面是下拉选项 想问这个要怎么实现...
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Jan 27, 2021
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675
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js 浏览器打印的预览尺寸和在样式里设置的高度一样会多出空白页。
js 打印问题,我css 设置的尺寸和打印预览设置的尺寸高度一样的时候,会撑开多出一页空白页,要预览的设置比css设置的大才不会多出空白页 宽也是,3个子div的宽度加起来刚刚好等于父div的宽度会自动换行,没预览,在浏览器是正常显示的, ... 和css设置尺寸有出入吗?还是什么原因?刚好的时候会出现空白页有什么好的解决方案?哪位大佬可以帮忙回答下,谢谢!...
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Jan 27, 2021
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js
0
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512
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想做一个这样样式的视频播放器?H5原生的没有办法满足?
想做一个这样样式的视频播放器,H5原生的样式没有办法满足,有什么好的插件推荐,或者方法解决吗?...
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Jan 27, 2021
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544
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flex布局,元素覆盖容器的问题,怎么兼容IE11?
如图所示,容器是一个灰色的正方形 容器内的元素是一个黑边框的正方形,在容器内部居中显示 1 当元素不大于容器时可以居中; 2 当元素超出容器时,IE11里面没法居中了(谷歌浏览器照样可以居 ... 100px'> <div class='outer'> <div class='inner'> 1 </div> </div> </body> </html>...
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Jan 27, 2021
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votes
646
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react 使用useEffect 异步函数 数据更新 demo不更新
使用了一个立即执行函数 异步的 但是如果我没有执行下面那个 if (code == 'update') { setFormData(parentObj); } 初次渲染demo视图是不会发生变化的,对hooks的渲染机制不是很了解,求大佬指点。...
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Jan 27, 2021
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react
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367
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java - Spring 2 WebSecurity different Authentifications not working as intended
I'm currently struggling with the WebSecurityConfig from Spring. I do have a service which is protected with an IPAuthProvider ... m really stuck at this point. Thanks in advance!...
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Jan 27, 2021
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java
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629
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实现一个arrange函数,可以进行时间和工作调度
实现一个arrange函数,可以进行时间和工作调度 // [ > ] 表示调用函数后的打印内容 // arrange('William'); // > William is notified // arrange('William').wait(5).do( ... 些方式让一些任务立即执行,延后执行 我很想通过这个demo 学会调度方面的知识;再次感谢...
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Jan 27, 2021
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python - What is the pythonic way of running an asyncio event loop forever?
From the docs it seems the recommended way to kickstart a asyncio application is to use asyncio.run(), so my ... , one way of sleeping forever on the asyncio event loop?...
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Jan 27, 2021
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javascript - Angular: Prevent Default only in parent div
I have a bootstrap dropdown menu in my angular app. Inside the dropdown there are some menu links. On click of the dropdown div I have ... href="#">Logout</a> </div> </div> </div>...
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Jan 27, 2021
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405
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如何理解database()函数中directory为空
创建组合分区(COMPO)时,partionScheme时一个包含数据库句柄的向量. 此处的数据库句柄比如db=database(,VALUE,2017.08.07..2017.08.11)中directory为空意思是什么?...
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Jan 27, 2021
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903
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psycopg2 sql.SQL how to implement timestamp > now() - INTERVAL '8 days'?
Needed to select records newer, than 8 days from several tables This is not working :( self._getRawData = sql.SQL("SELECT * FROM {} ... - INTERVAL {}") ... sql.Literal('8 days')))...
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psycopg2
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python - Reading credentials from one file into another
I have one py file where I want to call credentials of different accounts on the user choice, I have the below ... any other way, please provide a solution. Thanks in advance....
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Jan 27, 2021
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