字符串处理是JavaScript开发中最基础也最容易踩坑的领域，尤其是length、split、substring、startsWith这四个高频方法。很多看似诡异的问题，本质上源于对底层编码和API边界行为的理解偏差。JavaScript字符串基于UTF-16编码，length统计的是代码单元而非可见字符数，这导致emoji截断、字数校验出错等常见事故 ...
Worker move goods for despatch in a redistribution centre of US online retail giant Amazon in Horn-Bad Meinberg, western Germany, on December 9, 2024. INA FASSBENDER/AFP via Getty Images Cloudflare's ...
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