what? The Intersection Observer API is a modern JavaScript web API. Observer lets you react when an element enters or leaves the viewport—efficiently and without performance pain. Problem it solves. Before Intersection Observer, detecting visibility usually meant: Listening to scroll events Manually calculating element positions Running that logic constantly while scrolling That approach: Hurts performance…
最近在服务器上修改了 SSH 默认端口，遇到密钥登录卡住、超时的问题。这里记录一下排查和解决过程，方便以后参考。 前提条件确认 在排查前，我确保了以下条件： 服务器本地防火墙已经关闭或允许新端口 云服务商安全组/防火墙已经放行该端口 TCP 连接能够正常建立（通过 telnet IP 端口号 验证） 也就是说网络通畅，问题出在 SSH 配置或认证阶段。 问题现象 修改端口后，使用密钥登录时客户端出现超时，日志大致是： Outbound: Sending SERVICE_REQUEST (ssh-userauth) Inbound: Received EXT_INFO Timed out while waiting for handshake 分析发现： TCP 连接正常 SSH 握手完成 卡在密钥认证阶段，服务端不响应 排查分析 PubkeyAuthentication 默认被禁用 查看 /etc/ssh/sshd_config： #PubkeyAuthentication yes 注释掉意味着密钥登录默认关闭 客户端发送密钥请求时服务端不响应 → 超时 结论：修改默认端口后，很多 Linux 镜像会默认将密钥登录注释掉。 家目录及 .ssh 权限 SSH…
If you’re thinking of outsourcing your window cleaning to a robot-helper, read this first.
The BBC and YouTube partnership has left a lot of burning questions unanswered, but we’ve got them for you.
Want a Dolby Atmos soundbar but short on space? This model from Klipsch could be the ideal solution.
What is the Claude Agent SDK? In simple terms, it is a development framework/library that allows developers to use Claude as an “intelligent brain” to build automated agents, which have the ability to: Read files, execute commands, search the web, and more Automatically manage conversation context, avoiding context misalignment Run complex workflows rather than single…
Agentic analytics describes a way to perform analytics using AI agents that act with intent. These agents do more than answer a single question. They explore data, create visualizations, and suggest where deeper analysis could help. The goal is to reduce manual effort while improving how quickly teams learn from data. Traditional analytics depends on…
DevOps learning usually starts well… and then breaks. You learn Linux. You learn Git. You run Docker commands. But when it’s time to connect pipelines, cloud infrastructure, monitoring, and automation, most learning paths fall apart. DevOpsMind v1.1.1 is our attempt to fix that — with hands-on labs that focus on how systems actually work. What’s…
How to watch 2026 BBL Final live streams for FREE, with Finn Allen and Mitchell Starc set to light up the Scorchers vs Sixers clash at Perth Stadium.
I pit WiiM’s Lite Wi-Fi speaker against the Sonos Era 100, but which will come out on top: spacious sound or outrageous bass?
