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ubuntu - How to prevent any interference when benchmarking code execution in the linux kernel?

I'm following this whitepaper by intel to benchmark code execution. It uses cpuid to fence the reads of the timestamp ... benchmark on an i9-9900 but got the same spikes there....

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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同样的sql语句，使用navicat查询数据和在yii2.0用查询返回的结果不一样？

1.目的：想通过sql语句查询数据，并按到大到小排序，相同的数据有相同的排名值这条语句在navicat中查询得到了想要的结果；但是通过php写sql语句，返回的结果却不对可是，仅仅是将数据范围变大了，查询出来的数据对的？？？ 2 ... 范围不一样？同时，要是把sql语句放到navicat中就全部能得出正确的结果~~~~ 请大家有空就帮忙解答一下，谢谢...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ruby on rails - Saving an object without its association

I am trying to create a cart that is able to be utilised even if the user does not login. I am currently using ... cart] = @cart.id end end end def login? !!current_customer end...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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多用户访问一个php程序，他们之间没有冲突，原理是什么？

例如thinkphp程序中有一个class，它有一个属性为获取用户的referrer if($_SERVER['HTTP_REFERER']==null){ $visitor_info.='&referrer='.'empty'; }else{ $visitor_info.=' ... 是不是每个用户访问时，都会在内存中划一块区域保存对应的引用？？...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python 安装 Anaconda 环境变量问题请教

Mac 安装 Anaconda 后，配置了网上查到的环境变量配置方法，但还是一直报错找不到 conda 我在终端里进入到 Anaconda 目录里： cd /anaconda pwd # /anaconda source ./bin ... ： export PATH= /anaconda/bin:$PATH 这种情况的环境变量到底该怎么配置呢？麻烦了 ...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - React-Native: State changes affecting view only on next action/rerender?

I have a component where user can add items to their shopping cart, next to each item it shows either a ... to return JSX instead of conditional rendering inside JSX itself?...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ios - Reload data but the ObservableObject is not working

With SwiftUI, I'm trying to update the data when I create a Favorite object in the database. It is created ... with JSONDecoder. Any help or explanation is welcome! Thank you....

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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关于腾讯云建站的问题

我在腾讯云上购买了域名，云服务器和云解析。网页是静态网页，以html、css、js完成，作为一个非计算机专业的小白请问各位大大应该如何操作？...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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form下载文件，指向iframe ，如何判断iframe加载完成？

执行downFile方法像是没指向iframe 还是判断iframe加载完成的事件有错？ <form id="formDownload" target="downloadTarget" style="display:none;" ... != 'complete') return; else { onComplete(); } } }...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Proper way to parse requirements file after pip upgrade to pip 10.x.x?

So today I did found out that with the release of pip 10.x.x the req package changed its directory ... ? Or what is actually best practice without using parse_requirements?...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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从单文件组件.vue中引入了什么？

App.vue文件: <template> <div id="app"> <img src="./assets/logo.png"> <h1></h1> <h2>Essential Links</h2> <ul> <li><a href ... ？原github项目地址：https://github.com/vuejs-temp... 求大神解答，不胜感激...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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寻求统计新增合同数的方案

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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298 views

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如何保证复制粘帖内容不变形

有下面的内容： awk 'BEGIN {maxlength = 0} { if (length($0) > maxlength) { maxlength = length($0); longest = $0; } } END { ... set sts=4 set expandtab set shiftwidth=4 热和tab键都会自动转换成空格的 ...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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377 views

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cocos2d-js开发，刚入坑，大家都采用什么方式开发。

刚入坑，cocos2d发展不错，不过有很多分支，根据现在各种网站资料，决定使用cocos2d-js 书本和大多数网站资料都采用的webstorm或者cocos code ide 其中cocos code ide官网已经取消下载链接了，现在推荐的是cocos ... 开发方式不同，有很多拖拽目前大家在开发中采用的哪种开发方式更多一些优势？三克油...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - How to handle the scroll event with animation in each monent's state?

I want to do a scroll event animation, here is the steps: A card element(div&img, let's named it CARD) in the middle ... . PS: this is the demo animation site I want to follow....

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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服务器上的C盘空间不足，该怎么正确扩容？

很早之前的服务器，WindowsServer2003的，之前c盘只分配了30G，D盘200G+ 现在系统C盘系统盘可用空间0，能删的东西都删了。因为是远程的，上面还跑着网站，代码放在D盘，如何在保证系统不宕机的情况下，把D盘的空间分一部分给C盘？目前的想法是新建一个分区E，把D盘的内容拷贝进去，把D盘格式化后和C盘合并，E盘改为D，请问这样做可行吗？...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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springboot新手学习

各位大神们有没有系统的学习springboot的资料和代码可以推荐一下和给一下链接吗？在GitHub上和百度上的学习资料特别零散谢谢啦~~...

asked Feb 5, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mac上push代码的时候提示fatal: the remote end hung up unexpectedly?

仓库用的是https://git.9vz.cn/ 里面的 push代码的时候报错fatal: the remote end hung up unexpectedly? 在mac os上push的时候报错, 换成windows可以提交, 按照网上设置了大小后还是报错有解决的同学帮一下忙, 谢谢!...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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334 views

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c# - How to use default serialization in a custom System.Text.Json JsonConverter?

I am writing a custom System.Text.Json.JsonConverter to upgrade an old data model to a new version. I have ... to Json.NET's JsonConverter.CanWrite property. Demo fiddle here....

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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243 views

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How do I execute a function on a page after navigating to it in Flutter?

I have a CupertinoDialogAction button in Flutter that navigates back to a page with a timer. I want to start the ... navigate to the timer page upon being clicked. Current Code...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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如何提高DolphinDB的写入性能？

我正在DolphinDB上执行各种计算，速度足够好。但是我在DolphinDB中的写性能遇到了障碍，因为我的数据有成千上万的列，所以要花几秒钟来写100条记录。我该如何改善？...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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295 views

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android - I want to do a task if a specific option of arraylist is clicked

I want to do something when a specific part of the array list is clicked. I added the list on bind view holder ... something on the subject list if a specific class was selected....

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - Route changing issue

It is supposed to change the route to "home" when signed in and stay in it until the user logs out, but instead it changes ... ; } }) } When I console.log(data) it shows "success"...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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bash - How to list names and descriptions of all loaded kernel modules

How to list module names and descriptions in the following format? ... ext4 Fourth Extended Filesystem video ACPI Video ... Driver ... How to combine both names and descriptions?...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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205 views

1 answer

js数组怎么替换值？

我有一个数组A，A = ['a', 'b', 'c'] 我要把A数组的a替换成苹果，把b替换成香蕉，如果没有可以替换的值，就不变，就是希望把数组中的值替换成一个对应的值，请问该怎么做？...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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How can I specify an IP address when OpenThread joins a mesh?

I would like to assert some control over the IP address set by OpenThread when it joins a mesh. The first 8 bytes ... come from. Any help would be greatly appreciated, thank you....

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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518 views

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用jwt管理登录，怎么统计网站在线人数？

用jwt管理登录，怎么统计网站在线人数？...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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235 views

1 answer

关于js用function和用class定义的类中使用eval作用域的问题

为什么在用function和用class定义的类中在同一个作用域内使用eval函数结果会不一样呢? function和class有什么区别呢? Chrome和火狐运行结果一样 (function(){ function A(){ this.run= ... 定义 console.log(b) } } var a=new A(); a.run(); })();...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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