代码完成，初次提交

dist/favicon.js

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+"use strict";
+/**
+ * favicon的获取顺序为：
+ * 		1、 拉取指定网址，并检测html代码中header->link标签是否存在favicon，如果存在则使用它们。
+ * 		2、当第一步不满足的时候回进行猜测，一般猜测 favicon.ico、 favicon.png、 favicon.svg、favicon.gif，如果存在并且mime类型是图片则返回。
+ * 		3、如果上面两步都不满足，则表示未找到favicon
+ */
+var __importDefault = (this && this.__importDefault) || function (mod) {
+    return (mod && mod.__esModule) ? mod : { "default": mod };
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+const url_1 = __importDefault(require("url"));
+const request_1 = __importDefault(require("request"));
+//处理link标签
+function parseLinkTag(uri, link, types) {
+    //内容读取
+    link = ' ' + link.trim().replace(/(^<\s*link\s*)|(\s*\/?>$)/g, '');
+    let match = link.match(/\srel\s*=\s*"([\s\S]+?)"/);
+    if (!match)
+        return null;
+    if (!match[1].trim().split(/\s+/).filter(t => types.indexOf(t) >= 0).length)
+        return null;
+    match = link.match(/\shref\s*=\s*"([\s\S]*?)"/);
+    if (!match)
+        return null;
+    let href = match[1];
+    match = link.match(/\ssizes\s*=\s*"(\d+)[xX](\d+)"/);
+    const size = match ? { width: parseInt(match[1]), height: parseInt(match[2]) } : undefined;
+    //连接处理
+    if (!(/https?:\/\//.test(href))) {
+        let { protocol, host, pathname } = url_1.default.parse(uri);
+        protocol = protocol || 'https:';
+        if (/\/\//.test(href))
+            href = protocol + href;
+        else {
+            if (!host)
+                return null;
+            if (href[0] == '/')
+                href = protocol + '//' + host + href;
+            else
+                href = protocol + '//' + host + (pathname || '').replace(/\/$/, '') + '/' + href;
+        }
+    }
+    return { url: href, size };
+}
+//从HTML中获取faviconnpm install favicon
+async function getFavIconFromHtml(uri, option) {
+    return new Promise(resolve => {
+        request_1.default.get(uri, { timeout: option.timeout, headers: option.headers }, (err, res, body) => {
+            if (err || !body || !body.match)
+                resolve([]);
+            //获取所有link标签
+            const match = body.match(/<link[\s\S]+?>/g);
+            if (!match)
+                return resolve([]);
+            const favicons = match.map(link => parseLinkTag(uri, link, option.types)).filter(res => !!res);
+            resolve(favicons);
+        });
+    });
+}
+//猜测favicon
+async function guessFavIcon(uri, option) {
+    //用于测试请求一个地址，请求成功返回地址否则返回空
+    const fetch = (uri) => new Promise(resolve => {
+        request_1.default(uri, { timeout: option.timeout, headers: option.headers }, (err, res, body) => {
+            if (err || !body || !res.headers['content-type'])
+                resolve(null);
+            if (/^image\//.test(res.headers['content-type']))
+                resolve(uri);
+            else
+                resolve(null);
+        });
+    });
+    //猜测某个网址
+    const guessUri = async (uri) => {
+        const urls = await Promise.all(['ico', 'png', 'gif', 'svg'].map(suf => fetch(uri + '/favicon.' + suf)));
+        return urls.filter(s => !!s).map(s => ({ url: s }));
+    };
+    const { protocol, port, host } = url_1.default.parse(uri);
+    if (!host)
+        return [];
+    //如果没有提供协议，则猜测http和https
+    if (!protocol) {
+        const [f1, f2] = await Promise.all([
+            guessUri(`https://${host}`),
+            guessUri(`http://${host}`),
+        ]);
+        return [...f1, ...f2];
+    }
+    //否则猜测给定的地址
+    else
+        return guessUri(`${protocol}//${host}`);
+}
+/**
+ * get favicon from given url
+ * @param uri URL
+ * @param option Optional
+ */
+async function favicon(uri, option) {
+    //选项初始化
+    option = option || {};
+    option.types = option.types || ['icon'];
+    option.timeout = option.timeout || 5000;
+    option.headers = {
+        'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3610.2 Safari/537.36',
+        ...option.headers || {},
+    };
+    //从网页获取数据
+    let icons = await getFavIconFromHtml(uri, option);
+    if (!icons || !icons.length)
+        icons = await guessFavIcon(uri, option);
+    return icons;
+}
+exports.favicon = favicon;

dist/index.js

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+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const favicon_1 = require("./favicon");
+exports.favicon = favicon_1.favicon;
+module.exports = { favicon: favicon_1.favicon };