// 用于 react-helmet 正则替换 import { HelmetData } from 'react-helmet'; const RE_HTML_ATTR = /]*>/; const RE_BODY_ATTR = /]*>/; const RE_LAST_IN_HEAD = /<\/head>/; const RE_TITLE = /]*>([\s\S\n\r]*?)<\/title>/g; // 通过 react-helmet 修改模板 export default function helmet(content: string, helmetData: HelmetData) { let result = content; const bodyAttributes = helmetData.bodyAttributes.toString(); if (bodyAttributes) { result = result.replace(RE_BODY_ATTR, ``); } const htmlAttributes = helmetData.htmlAttributes.toString(); if (htmlAttributes) { result = result.replace(RE_HTML_ATTR, ``); } const base = helmetData.base.toString(); const link = helmetData.link.toString(); const meta = helmetData.meta.toString(); const noscript = helmetData.noscript.toString(); const script = helmetData.script.toString(); const style = helmetData.style.toString(); const title = helmetData.title.toString(); // 如果模板中存在 title，且 helmetData title 有内容则做替换 const existTitle = RE_TITLE.test(content); if (title.trim() && existTitle) { result = result.replace(RE_TITLE, title); } return result.replace( RE_LAST_IN_HEAD, ` ${base} ${link} ${meta} ${noscript} ${script} ${style} ${existTitle ? '' : title} `, ); }