101 lines
2.6 KiB
TypeScript
101 lines
2.6 KiB
TypeScript
// 删除标题里面没用的内容
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const pickTextNode = (el: HTMLElement) => {
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const fragment = document.createDocumentFragment();
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while (el.firstChild) {
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// 检查当前子节点是否是文本节点
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if (el.firstChild.nodeType === Node.TEXT_NODE) {
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// 如果是文本节点，将其移动到 DocumentFragment 中
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fragment.appendChild(el.firstChild);
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}
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else {
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el.removeChild(el.firstChild);
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}
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}
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return fragment.textContent;
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}
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// 删除里面的属性
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const removeAttributes = (el: HTMLElement) => {
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const attrs = el.attributes;
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Array.from(attrs).forEach((attr) => {
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el.removeAttribute(attr.name);
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});
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}
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// 格式化 HTML 内容
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export const formatHTML = (html: string, extraFormatter?: (doc: Document) => void) => {
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const nextDocument = document.implementation.createHTMLDocument();
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nextDocument.documentElement.innerHTML = html;
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// 删除标题内无效元素
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const titleEl = nextDocument.querySelectorAll("h2, h3, h4, h5, h6") as NodeListOf<HTMLElement>;
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titleEl.forEach((el) => {
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// 遍历并移除所有属性
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removeAttributes(el);
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el.innerHTML = pickTextNode(el);
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});
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// 优化 p 标签
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const paraEl = nextDocument.querySelectorAll("p") as NodeListOf<HTMLElement>;
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paraEl.forEach((el) => {
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// 删除空的 p 标签
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if (!el.innerHTML.trim()) {
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el.remove();
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}
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// 遍历并移除所有属性
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removeAttributes(el);
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// 删除 p 里面的 span 替换成普通 Text，应该没用的
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const spanEl = el.querySelectorAll("span");
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spanEl.forEach((el) => {
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el.parentNode.replaceChild(document.createTextNode(el.innerText), el);
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});
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});
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// 删除 figure 标签
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const figureEl = nextDocument.querySelectorAll("figure") as NodeListOf<HTMLElement>;
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figureEl.forEach((el) => {
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const img = el.querySelector("img");
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if (img) {
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el.innerHTML = "";
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el.appendChild(img);
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}
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});
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// 删除 style 标签
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const stylesEl = nextDocument.querySelectorAll("style");
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stylesEl.forEach((el) => {
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el.remove();
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});
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// 提取 pre 下面的内容
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const preEl = nextDocument.querySelectorAll("pre");
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preEl.forEach((el) => {
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removeAttributes(el);
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// hljs / prism
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const codeEl = el.querySelector("code") as HTMLElement;
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if (codeEl) {
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const nextCodeEl = document.createElement("code");
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nextCodeEl.innerText = codeEl.innerText;
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el.innerHTML = null;
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el.appendChild(nextCodeEl);
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}
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});
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if (extraFormatter) {
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extraFormatter(nextDocument);
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}
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return nextDocument.documentElement.innerHTML;
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}
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