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Recent questions
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vue 如何更优雅实现父子组件双向绑定?
我想封装一个公用的富文本子组件,父子组件传参使用props, $emit传参,子组件使用props接收参数content,在created 设置初始值,在watch监听父组件的改变的值content改变子组件的值 ... 件的valueData,绕了一圈; 请教下有没有更优雅的方案(除了vuex)? 子组件VueEditor.vue 父组件...
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architecture - Case diagram for Inventory Management System of Pharmacy
I have the assignment to construct a simple Inventory Management System for a pharmacy. It basically has three components ... correct or have errors. Can you offer some assistance?...
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el-calendar如何切换渲染指定月份?
为了实现类似这样,点击上边日期选择后切换到对应的月份,求教...
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c++ cli - Passing a CLI/C++ array to a C function
I need to call C functions from C#. I have created a C++/CLI wrapper to load the DLL and call the relevant functions ... call the C function. Please point me what I am doing wrong....
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mysql - This correlated subquery example seems wrong
I found this example on https://sqlbolt.com/topic/subqueries Isn't the "dept_employees" on the last row of ... 1054. Unknown column 'dept_employees.department' in 'where clause'"...
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请问前端如何实现分布加载?
像下图这种加载要怎么实现呢,数据还没有出来的时候先有个默认的样式?...
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Symfony5 The CSRF token is invalid - after upload on hosting
I have strange problem: i have dev version on pc on localhost and it;s work but after uploading on hosting on every form ... .submit) }} {{ form_end(contactForm) }} {% endblock %}...
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python - Reducing item in SQLite DB by a certain percentage
I'm trying to take a user input to reduce the price of an item in my database by the user input as a percentage. ... price was " + currentPrice) print("New price is " + newCost)...
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java mail本地发送邮件正常,上传到阿里云服务器报这个错!望各位大佬解决下
...
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How to get perl json access hash reference
I am trying to get remote host value which is remotehost . I decoded the json and able to get $name and $id values. but ... $obj{'auth'}->{'remote'}{'host'}; #getting error }...
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layout - Toolbar in android
Is there any tutorial easy to understand to create a toolbar with the home button aligned to the left and the log out ... app:showAsAction="ifRoom" /> </menu> Thanks for support!...
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rxjs 单位时间内只执行一次,这个怎么弄呢?
比如我有组件相互独立,但是都有一个共同的请求,怎么做到在指定时间内只请求一次,比如3秒中内。 不是只请求一次,只是在当前三秒内只执行一次,因为get的数据可能会变...
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函数声明与闭包的问题
下面是这个闭包面试题一直一知半解的,对于输出的结果我是这么理解的,每次循环的时候执行一遍立即执行函数,然后往匿名函数里传入一个形参i,每次立即执行函数调用的时候产生的匿名函数都不是同一个,所以console.log所引用的变量i也不 ... .log(i); }, 100 * i); })(i); } } //输出结果:0,1,2,3,4,5,6,7,8,9...
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express的res.redirect('back')是干什么用的啊?
我个人查找了官网文档 是下面这样描述的 A back redirection redirects the request back to the referer, defaulting to / when the referer is missing. res. ... 本页不变 有哪位大神知道这res.redirect('back')到底是干啥用的吗?...
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Jan 25, 2021
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Elisp 返回成 带英文引号的字符串
Elisp 怎么将 (concat "TODO" (setq c "将 Org 写作结构")) 返回成 带英文引号的字符串 "TODO将 Org 写作结构" 而不是 TODO将 Org 写作结构 我要将这个字符串用在命令行中...
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Django携带参数id跳转页面出现错误
错误信息:Reverse for 'org_detail' with no arguments not found. 1 pattern(s) tried: ['orgs/org_detail/(d+)/$'] views.py ... 'org_detail/(d+)/$', views.org_detail, name='org_detail'), ]...
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Jan 25, 2021
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linux centOS7环境下 替换tomcat9其中一个class文件,重启tomcat还是没有生效
如题,有没有大神知道是什么回事...
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Jan 25, 2021
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linux
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javascript - Touchmove not working on mobile like mousemove on desktop
Edit: I noticed that if I quickly touch the screen, a dot formed. When you touch the screen and then move it on the canvas, ... style="border:2px solid;"> </canvas> </body> </html>...
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Jan 24, 2021
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Codacy error : "All output should be run through an escaping function" in PHP project
I'm developing a small blog for school project using PHP. My school wants me to use Codacy to check my code quality. It ... gives me the same error on the same line of code......
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后台返回的pdf文件流不完全
后台是C++写的,采用mmap()文件映射把文件流放在返回的http data中,但是发现返回的文件流不完全,请问是怎么回事? 后台返回的文件流 把原文件用记事本打开的文件流 后台的核心函数 前端的核心函数 请问有大佬知道是为什么吗,pdf一直是损坏的...
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Jan 24, 2021
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php socket编程问题
此文章的代码来自于这篇文章PHP socket初探 --- select系统调用 <?php // BEGIN 创建一个tcp socket服务器 $host = '0.0.0.0'; $port = 9999; ... 时就已经定义了,$read 表示可读的 socket 数组,为什么 $listen_socket 会是 $read 的子元素?...
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Jan 24, 2021
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php
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webapck打包之后里面会带箭头函数
用webpack打包之后里面会有箭头函数,导致在ie里面用不了 webpack配置 babel配置 package.json 不知道是什么原因...
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router - how make this two 'separated' lans/networks see each other/works as one?
https://i.imgur.com/VUEkRbO.png i need that PC1 and PC2 see the others PC's ans if need access the shared ... is modem 'locked' and with no possibility to change his configs?...
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Jan 24, 2021
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请问element ui里的return和 callback()有什么区别呢?好像可以一起用?也可以分开单独用?
请问element ui里的return和 callback()有什么区别呢?好像可以一起用?也可以分开单独用?...
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javascript - Node.js POST login request doesn't return authenticated cookie
I am making a private API wrapper (Edit: I don't have the server-side code since I'm making this for another ... , the problem resided in the redirect to the user's dashboard....
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Jan 24, 2021
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element ui表单验证时遇到的问题
为什么我把那个result全部写在if的括号里面,就不行 单独拿出来就可以呢? 如图: ` let checkWords = (rule, value, callback) => { console.log(value) if (value ... return callback(new Error('关键词不能中英文混杂!不能有标点符号!')) } }`...
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webkitaudiocontext - How can I detect if Safari is really playing an audio file with webkit audio?
I am working on a multiuser webpage which plays sounds when buttons are pressed by any user. The system uses websockets to ... to present the user with a play button if it failed....
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Jan 24, 2021
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webkitaudiocontext
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flex子元素,插入img设置高度100%,宽度超出
flex的子元素div继承了父元素的高度 在子元素插入图片设置图片高度为100%,图片的高度填满父元素,但是宽度超出 请问这是为什么?如何解决? <body> <div style="height: ... ./../static/imags/voidlogo.jpg" style="height: 100%"> </div> </div> </body>...
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