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684 views

1 answer

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?...

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

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828 views

1 answer

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...

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

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844 views

1 answer

（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？...

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

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946 views

1 answer

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？...

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

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1.1k views

1 answer

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......

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

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985 views

1 answer

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?)...

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

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1.3k views

1 answer

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. :)...

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

0 votes

2.3k views

1 answer

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...

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

0 votes

1.1k views

1 answer

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:...

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

0 votes

1.5k views

1 answer

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...

asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.5k views

1 answer

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; }...

asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.4k views

1 answer

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!...

asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.8k views

1 answer

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!...

asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.6k views

1 answer

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？...

asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

1.6k views

1 answer

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?...