Recent questions in Technique[技术]

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c++ - Why is the pipe operator not working when I use ranges in C++20?

I am currently working through examples from the book Expert C++. In chapter 7, they offer the following code for mapping a ... else have this issue? I am using the g++10 compiler....

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c# - How can I access properties of dynamic object deserialized from a string using System.Test.Json?

using System.Text.Json; using System.Text.Json.Serialization; public static dynamic ... .AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeNextActionFilterAsync()...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql server - Trigger that doesn't allow you to introduce data if it already exists in a table

I'm a newbie when it comes to SQL Server and I have a problem creating a trigger. I have a table called ... IF EXISTS (SELECT Date, HallID FROM INSERTED) ROLLBACK TRANSACTION END...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - How to use the Async def expression correctly?

I make an asynchronous web application (using aiohttp, aiodocker and so on). Should I use async def expression ... : str) -> datetime: return datetime.fromisoformat(date_string)...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Autogenerate Random Images with Colors & Text in PHP

I have attached a procedure that I can use to generate random images. This works so far. But now I would like to have an ... ("Content-type:image/png"); imagepng($img); ?> ```...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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有一列有正有负的数，需要移动取14个数，对其正负数分别求和

如下图所示，有一列数num，有正有负，还有2列是pmsum和nmsum，分别是对num这列中正数的移动求和、负数的移动求和，移动窗口是14。请问在dolphindb database中，有什么函数可简单地实现？...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Firebase Phone Authentication not functioning for Release variant - Android

I have gone through numerous questions on SO about this issue but I am unable to figure out what my issue ... Its been mightily frustrating. Any pointers would be much appreciated!...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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webpack 为什么体验如此差，配这配那的？

我写一堆代码，我希望webpack 给我自动优化好就行。为什么它要让我配这配那。一堆烂事。。就不能自动点出最优解吗？我压根不想关注配这配那，我只关注页面效果和最高性能。另外先不说高性能表现了，首页要跑起来都得先配置一堆烂东西，才能看到效果。我是写前端的，我关注这些要干嘛？高手回答下这个问题。。...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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django多对多有多层时，怎么根据最上层的对象获取最下层的数据

多层级多对多关联的时候，怎么直接通过最顶层拿到最底层的数据啊，比如用户表User多对多关联角色表Role，角色表Role又多对多关联菜单表Menu，我怎么直接根据user对象拿到所 ... (Role) class Meta: db_table = 'menu' verbose_name = '菜单表' verbose_name_plural = '菜单表'...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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How to make this code from flatlist to grid in react native

I am quite new on react native and been trying to make below code from flatlist to grid/column any help will be appreciated. This ... width: width(100) }}></View> </View> : null }...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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598 views

1 answer

How to use Mutation observer instead of settimeout

I have js code which appends a div if an element with a particular class is present in the DOM. Here is ... never stops. Can anybody help in what went wrong in Mutationobersever....

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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435 views

1 answer

vue 使用防抖函数，绑定事件如何优雅卸载？

如下 throttle 是一个高阶函数，返回加了防抖功能的原函数但是这个卸载的话 throttle() 返回的新函数是否要保存个变量呢？因为卸载的时候要用到请问怎么写更合适呢 ... .addEventListener("scroll", throttle(this.onScroll, 500)); }, destroyed() { // 卸载事件 }...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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为什么set get 不能一直保存变量值呢

是这样的：我在A.java里启动了线程 t1.start 在t1线程里（因为功能分类只能在这里赋值）用set() 方法，给 c.java的变量 A 赋值然后在A.java里使用变量A 但发现A总是空值 debug时发现A确实被赋 ... 时，是有值的第二个 get方法访问变量，但是空值其实我就是想创建一个文件存放几个常用的全局变量 ...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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类似 git 的SQL增量脚本构建工具

不知道有没有这种工具，可以记录对数据库结构的变更，例如为表增加自字段、修改字段注释、新增了存储过程等等，可以构建出从上一次 commit 到目前做出的数据库结构上的变更（表数据不考虑）构建出SQL脚本，不用自己一笔笔记录下来了。用于将更新发布到测试环境中。...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - np.where multiple conditions?

I'm using numpy to add to a new column baased off another column. I believe only 2 arguments are allowed but I need 3. ... Other How do I add 1 more argument to get this output?...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - How to take array of numbers and return array with numbers doubled?

I'm trying to write a function that will take an array of numbers and return an array with those numbers doubled. ... array, only multiplying the numbers I have in return numbers....

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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390 views

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vue怎么下拉菜单碰到浏览器下边界的时候重新定位？

自己写了一个vue下拉框组件，现在是通过滚动条位置scrollTop 屏幕高度clientHeight，减去组件离顶部的距离来实现定位的，通过监听页面滚动scroll和resize来重置高度，这种方式来实现的感觉这种方式有些复杂，而且不是很顺 ... 计算错误，求问有没有更好的方式？例子就像element-ui下拉框那样的，随着位置变化会自动重新定位的...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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vue-awesome-swiper 不支持lazy懒加载问题分析

问题如：https://ostack.cn/q/10... 再配置参数设置 lazy: true,没有任何效果，网页端使用最新版的swiper没有这个问题，通过打印 swiper 对象发现猫腻，网页版：从截图中我们可以发现包 ... 并没有找到，或许这就是 vue-awesome-swiper 不支持 lazy 懒加载的原因，暂时不知道怎么解决！！...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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260 views

1 answer

reactjs - jest is not able to find helper functions

i am using react-mobx store in my react project while running test-case jest is not able to find helper functions ... rootDir>/node_modules/babel-jest', }, collectCoverage: true, }...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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336 views

1 answer

nginx中配置的X-Forwared-For拿到的是真实IP还是NAT转换后的外网IP

现在运营商用NAT技术转换了IP,那X-Forward-For中拿到的是客户端真实的内网IP还是出口网关的外网IP, 还是都记录到了?...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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499 views

1 answer

swoole源码分析，请问这里为什么要将引用计数+1，是为了应对什么情况呢

请问这里为什么要将引用计数+1，是为了应对什么情况呢？ static sw_inline void sw_zend_fci_cache_persist(zend_fcall_info_cache * ... ) { GC_ADDREF(ZEND_CLOSURE_OBJECT(fci_cache->function_handler)); } }...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - What is the equivalent of get_collection for the frozen/inference model?

So in my testing I purely used a checkpoint to test the model, using a checkpoint, I can ... .ctc_beam_search_decoder(logits,seq_len,beam_width=50,top_paths=1,merge_repeated=True)...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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KonvaJS中怎么随鼠标画线连接两个图形

如题，想实现的效果就是这样：我知道怎么用原生canvas实现，但是转到KonvaJS中就懵掉了...不清楚它的刷新原理，用了一个数组存鼠标移动时的零时线，但怎么画都出不来线，不知道哪错了/(ㄒoㄒ)/~~ 救救孩子吧，谢谢大佬们！...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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openedge - Progress 4gl - change font color of specific values while exporting temp table to .html file

I have a situation where I would like to change the font color of the specific values in a temp table while exporting to ... . END. PUT UNFORMATTED "</TABLE>" SKIP. OUTPUT CLOSE....

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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How to decorate all functions and class methods in python?

For debugging purpose, want to decorate all functions and Class methods in a module file automatically ? There are some methods ... mydeco(f): print(vars) time.sleep() return f...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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340 views

1 answer

android - Huawei Map and Location Kit - Bug when getMapAsync() is called inside LocationCallback

When I call getMapAsync() on onViewCreated() of the fragment, OnMapReady callback is ... null locationClient?.requestLocationUpdates(locationRequest, locationCallback, null)...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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470 views

1 answer

nvm 安装失败

...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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147 views

1 answer

vue如何动态创建路由？

有没有什么办法可以动态创建路由的？就是在打包生成线上文件后，后面我想要动态添加一些功能之类的，就是外部创建了新页面移到这个项目文件夹内或者就直接创建文件到当前项目文件夹内，然后在显示创建的页面。不一定只是页面，也可能是js。就是动态任意的那种。这种就类似于浏览器的那种扩展功能插件。有没有大神知道怎么做？...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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