was before is
伪元素before,after使用(如文本前的圆点)
其实主要就是要定义content:""; before或after会相对定义position:relative;最近的元素去定位; 比如实现一个文本前的黑色圆点: p::before { content: ""; width: 4px; height: 4px; background-color: ......
Why java21 is faster?
After upgraed from jdk8 to jdk21, we gain ~16% performance improvements, here are some possible valid enhancement. Reduce JNI Access: ~2x faster In Ra ......
依赖 is already defined in a single-type import
代码:import org.apache.commons.lang3.StringUtils; 不加依赖显示:Cannot resolve symbol 'lang3',加了依赖又显示:'com.sun.deploy.util.StringUtils' is already defined in a ......
std::is_trivially_destructible的作用
template <class Ty> void destroy(Ty* pointer) { destroy_one(pointer, std::is_trivially_destructible<Ty>{}); } 这样设计的好处主要体现在对泛型编程和内存管理的灵活性上。下面是一些可能的好处: ......
hive启动出现Cannot create directory /tmp/hive. Name node is in safe mode.
原因:进入了安全模式,hdfs在启动开始时会进入安全模式,这时文件系统中的内容不允许修改也不允许删除,直到安全模式结束。 执行命令: hadoop dfsadmin -safemode leave 退出安全模式即可 出现 Safe mode is OFF 表示成功退出 ......
hive启动出现Either your MetaData is incorrect, or you need to enable "datanucleus.schema.autoCreateTables"
hive启动出现: Required table missing : "`VERSION`" in Catalog "" Schema "". DataNucleus requires this table to perform its persistence operations. Either ......
Error in nextTick: “TypeError: Right-hand side of ‘instanceof‘ is not callable“报错解决
很难发现的小错误,如果不经意间写错了 代码,很可能会对报错摸不着头脑: 其实就是参数的type值首字母没有大写,就会报上述错误 ......
Python报错:WARNING conda.models.version:get_matcher(542): Using .* with relational operator is superfluous and deprecated and will be removed in a future version of conda.
参考: https://blog.csdn.net/weixin_45685859/article/details/132916216 报错: [23:59:14](pytorch) devil@OMEN:~$ [23:59:14](pytorch) deviconda install pytorc ......
关于 Web 开发中的 CSS before 伪元素
我用 Chrome 打开一个网页后,F12 打开 Chrome 开发者工具,在 Elements 面板观察到一些 DOM 元素有 ::before, 这是什么含义? 在Web前端开发中,::before 是CSS伪元素之一,它用于在指定元素的内容前插入生成的内容。这个伪元素允许开发者通过CSS样式向 ......
React项目报错:Element type is invalid: expected a string可能的原因
React项目报错:Element type is invalid: expected a string 起因:用了屎一样的React Antd组件库,坑太多实在用不下去了,代码不变直接改成Tdesign,于是就开始了解决无穷无尽的报错。。。 Element type is invalid: exp ......
关于 FontAwesome icon 的 before 伪元素
看下图这个放大镜的例子: .fa-search:before 是一个CSS选择器,它被用于指定某个具有类名为 "fa-search" 的元素的伪元素 ":before"。这个样式规则的作用是在该元素的内容之前插入一个字符,具体的字符是 "\f002"。在这里,"\f002" 是一个 Unicode ......
error: Microsoft Visual C++ 14.0 or greater is required
1、错误背景 python在安装 aiohttp库 时,出现 Microsoft Visual C++ 14.0 or greater is required的提示: 2、解决方案 按照错误提示,访问 https://visualstudio.microsoft.com/visual-cpp-bui ......
【解决】模拟器设置system读写报错'/dev/block/sda6' is read-only mount: '/system' not in /proc/mounts adb disable-verity failed to read fstab '/dev/root' is read-only
remount 失败 '/dev/block/sda6' is read-only adb disable-verity failed to read fstab '/dev/root' is read-only mount -o remount,rw /system mount: '/system ......
vue报错export 'default' (imported as 'VueRouter') was not found in 'vue-router'
直接使用npm install vue-router -save安装的路由,运行报错 经排查后发现是安装的vue-router版本太高 使用 npm uninstall vue-router 卸载之前安装的路由 使用 npm i vue-router@3.5.2 安装低版本的路由 问题解决!!! ......
在eclipse中拖动项目到Tomcat服务器中报错:Project facet Java version 16 is not supported.解决办法
![](https://img2023.cnblogs.com/blog/3264156/202311/3264156-20231130200508727-1255579026.png) ![](https://img2023.cnblogs.com/blog/3264156/202311/3264... ......
多线程连接池报错报警告[connectionpool.py:305 ] [WARNING] Connection pool is full, discarding connection: 127.0.0.1. Connection pool size: 1
第一种方法: 按照建议 WebDriverWait 帮助解决了问题 from selenium.webdriver.support.ui import WebDriverWait from selenium.webdriver.support import expected_conditions a ......
SpringBoot Resolved [org.springframework.web.multipart.support.MissingServletRequestPartException: Required request part 'file' is not present]
Resolved [org.springframework.web.multipart.support.MissingServletRequestPartException: Required request part 'file' is not present] ......
sqlstudio连接MySQL数据库报错public key is not allowed
jdbc:mysql://192.168.8.200:3306/company?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8&useSSL=false&allowPublicKeyRetrieval=true 在MySQL 5. ......
Hbase关于建表一直报错Master is initializing
最近在做大数据实验的时候发现hbase突然不能建表了,list命令没有问题而建表就报错 如下图所示 网上的答案是打开zookeeper的命令行删除下面的hbase,但是没有说明效果 后来,我突然想到,之前我搭载hadoop和hbase的时候,Hadoop并没有开启高可用 解决办法 先关闭hbase, ......
As a project I always want to create for myself as a gift, the MVVM framework is more or less satisfying
I used to want to build a MVVM project for myself, especially since I wrote my mementowriter project which is no jQuery, and that was very time consum ......
/// is_class template<typename _Tp> struct is_class : public integral_constant<bool, __is_class(_Tp)> { };
这段代码是一个C++模板,用于检查一个类型是否是类。下面是对这段代码的详细解释: template<typename _Tp>:这是一个模板声明,表示这个结构体可以接受一个类型参数_Tp。 struct is_class:这是一个结构体的声明,结构体的名字是is_class。 : public in ......
vue Vite3出现错误runtime-core.esm-bundler.js:6835 Uncaught TypeError: normalizeKey is not a function at createBaseVNode (runtime-core.esm-bundler.js:6835:19)
原因是在引入Element-Plus的顺序在vue之前导致,重新调整下他们的顺序后,问题解决。 import App from './App.vue' import { setupI18n } from '/@/i18n' import { setupRouter } from '/@/router ......
Mysql - Error 1055: Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'user.nickname' which is not functionally dependent on columns in GROUP BY clause
编写SQL时需要如下错误,即出现错误 ERROR 1055,SELECT列表不在GROUP BY语句内且存在不函数依赖GROUP BY语句的非聚合字段'edusassvc.u.nickname',这是和sql_mode=only_full_group_by不兼容的(即不支持)。 分析问题 1)原理层 ......
解决:Expected 1 line break before closing bracket, but no line breaks found.eslint
运行时报错以下 解决 在eslintrc.js rules下添加以下代码 'vue/singleline-html-element-content-newline': 'off', 'vue/multiline-html-element-content-newline': 'off', ......
[WARNING] The POM for com.alibaba:druid:jar:1.1.21 is invalid, transitive dependencies (if any) will not be available, enable debug logging for more details是什么问题
这个警告表明 Maven 在尝试下载或处理 com.alibaba:druid:1.1.21 这个依赖项时遇到了问题。警告的具体内容是说 POM(Project Object Model)文件无效,这可能会导致 Maven 无法正确地处理传递性依赖关系。有几种可能的原因和解决方法: 1.网络问题: ......
MQTT vs. HTTP: which one is the best for IoT?
MQTT vs. HTTP: which one is the best for IoT? 翻译 搜索 复制 ......
MySQL5.6建索引时遇到 Specified key was too long; max key length is 767 bytes错误提示解决办法
解决方法 // 查看 show variables like "innodb_large_prefix"; show variables like "innodb_file_format"; //修改最大索引长度限制 set global innodb_large_prefix=1; 或 set g ......
mysql 报错which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by
Expression #2 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'd.Id' which is not functionally dependent on columns in GROU ......