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Recent questions
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c++ - Why can copy elision not optimise all copy operations?
I read about copy elision and how it can fasten up Programms by giving possibilities to write code more straight foreword ... copies leading to a or in the modification of b?...
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Jan 27, 2021
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python - How can I figure out a new row by current row divide its last row by dataframe?
price = price 0 111 1 222 2 333 3 444 I want newprice = price 0 111 1 222/111 2 333/222 3 444/333...
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(编程小白)问如何判断int是否溢出?
题目如图: 看到一题的解法如下: #define isOverLength 0 int reverse(int x){ long lRet = 0; while(0 != x) { lRet = lRet * 10 + x % 10; x = x / 10; } ... ?为什么加上这一段就可以判断int是否溢出,这个有点不理解?有没有大神可以帮忙解释一下?...
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请教个slot-scope 命名问题
父组件 <div style="width:100%;height:auto;background:red"> <slot :default="nav"></slot> </div> data() { return { nav:[] } }, methods:{ ... ="bbb" 这个bbb也是自己随便取的名 和 父组件slot的名字也不相关吗?...
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请教个slot-scope
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github手动合并别人的pr,但是PR状态不会自动变为merged
我通过下面的命令合并PR git checkout -b malienist-pr/mxeditor-types master git pull https://github.com/malienist/mxgraph-type-definitions.git ... 但是感觉这样不太好 https://github.com/hungtcs/mx......
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Jan 27, 2021
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逻辑习题: The Science of Programming, David Gries 第二章习题七答案有一句话看不懂
请问:原书解答中 This adds m propositions {E}i at the main level.到底啥意思?(见附件中划红线那句) 这使得主层增加了m个{E}i.(按我理解,应该是一次操作增加了k个啊.) 这使得主层由m个g组成的{E}i的个数增加了.(难道是这个意思?)...
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javascript - Ag grid Enterprise Server side Custom Filter not working
I am using the Enterprise version of the AgGrid. and want to apply a custom filter on the grid. How can ... }; gridOptions.api.setFilterModel(externalFilter); Thanks In advance. :)...
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Jan 27, 2021
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css - How to present website on different devices?
I've been wondering about one thing, but I don't really know what to call it. On some websites, they put an ... there an online tool that makes this possible? Here an example image...
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javascript - The second same assertation doesn't work in Cypress
I am writing a code that will check the names of the dropbox menus. With the first one it works fine, but for the others ... : In the dropdown that doesn't work with 'td' : Error:...
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Jan 27, 2021
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ruby on rails - Sprockets raises "no implicit conversion of nil into String" when using image_path or stylesheet_link_path
Expected behavior It should load resources. Actual behavior image_path(...), stylesheet_link_tag should not raise TypeError: no implicit ... .5.7/lib/ruby/gems/2.5.0/gems/a...
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Jan 25, 2021
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forEach遍历数组查询数据库,返回多个Promise,如何接收?
forEach遍历数组查询数据库,返回多个Promise,如何接收? 本人小白,没有系统的学过nodejs和es6,平常也就写个增删改查,面向百度足够了 但是最近在帮同事做一 ... : async function(yishuzu,ershuzu){ const yires = await chaxun(yishuzu); return yires; }...
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Jan 25, 2021
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linux - Starting VSCode and running command in integrated terminal from command line?
The title summarize my question, but the long version would be that I am trying write a shell script that opens Visual ... any solution to this issue? Thanks in advance for help!...
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Jan 25, 2021
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save created excel file to azure blob container. path issue
Using an Azure Function I create an excel file and I am trying to save it to my Azure Blob Container. The code to ... if that is the issue. Any help would be greatly appreciated!...
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Jan 25, 2021
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save
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vue中如何动态引入不同文件夹下的组件
有个业务场景,在import引入组件时,需要先判断对应文件夹下是否这个vue文件,如果有就引入这个,如果没有就引入公共文件夹下得vue文件 已经想到用require.context判断对应文件下是否有这个vue文件 请问如何根据结果动态引入组件?...
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javascript - RxJS. Combine observables that emit less then 1 second apart
There are two observables that may be emiting together or separately: stream1 and stream2. I need my subscription to fire ... after stream1 does. Any way to achieve that with RxJS?...
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Jan 24, 2021
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那家技术课堂好一点?
思否? 网易? 瓜哇? 还有啥课堂 有没有好一点的推荐一下...
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Jan 24, 2021
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vuex接口请求无论失败或成功都会返回reject?
` Login({ commit }, userInfo) { console.log(commit, userInfo) const username = userInfo.username.trim() const ... }) return Promise.reject(error) } ) export default service...
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Jan 24, 2021
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forge viewer如何实现使指定元素高亮
想实现点击一个名字调用出对应的id,通过id号使模型中对应的元素高亮,例如:点击<p>门</p>//门对应的id=32,就会使viewer中模型的id:32的元素高亮...
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forge
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vue-cli 生成的项目,commit -m""时没有触发githooks
vue-cli 生成的项目,在vscode使用git commit -m -- 的时候为什么没有触发package.json中的 "gitHooks": { "pre-commit": "lint-staged" }, " ... 下面附图 1 package.json 2 vue.config.js 3 eslintrc.js 4 .git/hooks...
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Jan 24, 2021
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php 怎样判断逗号分隔的字符串是否包含某个字符串
比如:$abc="1,21,32,44,55"; 如果直接判断是否包含字符串+逗号的话,比如“1,”explode函数、substr函数、这些判断子串函数就会有问题,一般用循环是可以检测,php有没有什么内置的方法,可以判断出来。 比如类似这种: $needle= '1'; explode($needle,$abc,',');...
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Jan 24, 2021
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1.8k
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vue template 标签 eslint 报错?
是tslint 先提示我有错误,说我少了分号, 然后我保存,就自动格式化 加上分号了 这肯定是错误的 是哪块配置有问题吗,有没有遇到这种情况的...
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How to get rid of Invalid double error in flutter
This is my Sales page where I navigate to a form in Add sales page to add data class _Sales extends State<SalesList ... ( ){ _available = _opening + _issued; return _available; }...
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Jan 24, 2021
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H5 WEB ,点击 Notification,当窗口不存在时如何指定打开的URL?
步骤: 1 打开webapp, 比如www.abc.com/abc, 2 发送通知Notification. 3 关闭第一步打开的网页。 4 点击通知栏的消息就会在浏览器打开 www.abc.com 问: 如何在第四步打开www.abc.com/abc PS: 网址我随便敲的,只为说明问题。...
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c - Is assignment x=1; always an undefined behaviour according to C17?
I'm looking at the final draft of C17, N2176. Here, I'm concerned with what kind of expression with side ... part of the standard that makes this statement behaviour not undefined?...
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excel - VBA Create row below based on two criteria
I am having a hard time getting the below logic to work. The issue seems to be where the Year function is ... If Next R End With Next Application.ScreenUpdating = True End Sub...
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java - setText to many buttons - javaFX
Im working on some card game in java. I'm using javaFX for an user inteface but i have a little problem with it. I have ... (board.getListFields().get(24).getWord().name()); }```...
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Jan 24, 2021
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关于rxjs使用的问题
rxjs虽然对着文档学着使用了一下,但感觉还是很难融会贯通 我设计了这样一个简单的场景,一个异步的函数get,希望他同步得按顺序依次打印一个数组,并记录这个函数调用的次数 不使用rxjs我是这样实现的: ... console.log(arr[idx]) ++count f(++idx) }) } 请问各位,在rxjs下,怎样优雅得实现这个功能?...
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token如何确保用户登录的唯一性
使用的shiro-redis-spring-boot-starter的包,但发现前后同一账户两次登录产生的不同token都能进行相关用户权限的操作,这显然不符合逻辑。理想的状态是,当用户再次登录后,只有新生成的token有效,这样防止用户在不同客户端登录忘记退出造成的问题,请问可以实现么?我是新手。...
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