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Design & media
Legacy Web Standard
Try itUse when maintaining or safely modifying existing non-framework frontend code: vanilla JavaScript, jQuery, HTML/CSS, MPA pages, server-rendered templates, legacy plugins, or long-lived code that should stay in its current stack. Use migration skill when planning a move to React/Vue/TypeScript; Chine
What it does
在不重写技术栈的前提下安全维护 vanilla JS、jQuery、HTML/CSS 和服务端模板项目。
The skill document
传统前端项目规范（JS + jQuery + HTML）
Purpose
在不重写技术栈的前提下安全维护 vanilla JS、jQuery、HTML/CSS 和服务端模板项目。
Procedure
- 先确认本次改动是维护旧栈还是迁移；迁移到 React/Vue/TypeScript 时切换到现代化迁移 workflow。
- 沿用现有架构和代码风格，优先修复问题，不在一次改动中引入多项现代化。
- JavaScript 用 IIFE/命名空间减少全局污染，事件绑定优先委托到合理容器。
- DOM 更新缓存选择器、批量操作、转义用户输入；Ajax 必须处理 loading、error、空状态和防重复提交。
- HTML/CSS 保持语义、label、alt、BEM/既有命名和低选择器深度。
- 安全重点检查
.html()、innerHTML、URL 参数渲染、CSRF token 和文件上传。
Detailed References
涉及 jQuery 命名空间、事件绑定、Ajax、XSS 转义、文件组织和维护清单示例时，加载 references/legacy-patterns.md。
Constraints
- 在现有架构内改进，不要引入与项目格格不入的现代框架。
- 渐进增强优于推倒重来。
- 禁止用
innerHTML/.html()直接插入用户输入。 - 避免全局变量污染。
- 每次聚焦一个维护点，避免顺手重构整个模块。
Expected Output
改动与旧项目风格一致，无全局变量泄漏，事件和 DOM 操作可维护，Ajax 状态完整，用户输入已转义，渐进改进不破坏现有功能。
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