{"id":239,"date":"2026-03-09T22:29:08","date_gmt":"2026-03-09T14:29:08","guid":{"rendered":"https:\/\/www.resilence.cn\/?p=239"},"modified":"2026-03-09T22:29:08","modified_gmt":"2026-03-09T14:29:08","slug":"day-7-%e5%ad%97%e7%ac%a6%e4%b8%b2%e6%93%8d%e4%bd%9c","status":"publish","type":"post","link":"https:\/\/www.resilence.cn\/?p=239","title":{"rendered":"Day-7-\u5b57\u7b26\u4e32\u64cd\u4f5c"},"content":{"rendered":"<h1>Day 7: \u5b57\u7b26\u4e32\u64cd\u4f5c<\/h1>\n<h2>\ud83c\udfaf \u5b66\u4e60\u76ee\u6807<\/h2>\n<ul>\n<li>\u638c\u63e1\u5b57\u7b26\u4e32\u7684\u521b\u5efa\u548c\u57fa\u672c\u64cd\u4f5c<\/li>\n<li>\u5b66\u4f1a\u4f7f\u7528\u5b57\u7b26\u4e32\u65b9\u6cd5\u8fdb\u884c\u8f6c\u6362\u548c\u67e5\u627e<\/li>\n<li>\u7406\u89e3\u5b57\u7b26\u4e32\u7684\u4e0d\u53d8\u6027<\/li>\n<li>\u638c\u63e1\u6a21\u677f\u5b57\u7b26\u4e32\u7684\u4f7f\u7528<\/li>\n<li>\u5b66\u4f1a\u5904\u7406\u5e38\u89c1\u7684\u5b57\u7b26\u4e32\u64cd\u4f5c\u573a\u666f<\/li>\n<\/ul>\n<h2>\ud83d\udca1 \u6838\u5fc3\u6982\u5ff5<\/h2>\n<h3>\u4ec0\u4e48\u662f\u5b57\u7b26\u4e32\uff1f<\/h3>\n<p>\u5b57\u7b26\u4e32\u662f\u6587\u672c\u6570\u636e\u7684\u5e8f\u5217\uff0c\u5728 JavaScript \u4e2d\u7528\u5f15\u53f7\u5305\u56f4\u3002<\/p>\n<pre><code class=\"language-javascript\">let str1 = &quot;Hello&quot;;           \/\/ \u53cc\u5f15\u53f7\nlet str2 = 'World';           \/\/ \u5355\u5f15\u53f7\nlet str3 = `Hello ${name}`;   \/\/ \u6a21\u677f\u5b57\u7b26\u4e32\n<\/code><\/pre>\n<h3>\u5b57\u7b26\u4e32\u7684\u7279\u6027<\/h3>\n<ul>\n<li><strong>\u4e0d\u53ef\u53d8<\/strong>\uff1a\u5b57\u7b26\u4e32\u4e00\u65e6\u521b\u5efa\u4e0d\u80fd\u4fee\u6539<\/li>\n<li><strong>\u7d22\u5f15\u8bbf\u95ee<\/strong>\uff1a\u53ef\u4ee5\u901a\u8fc7\u7d22\u5f15\u8bbf\u95ee\u5355\u4e2a\u5b57\u7b26<\/li>\n<li><strong>\u957f\u5ea6\u5c5e\u6027<\/strong>\uff1a<code>length<\/code> \u8fd4\u56de\u5b57\u7b26\u6570\u91cf<\/li>\n<\/ul>\n<h2>\ud83d\udcdd \u521b\u5efa\u5b57\u7b26\u4e32<\/h2>\n<h3>1. \u5b57\u7b26\u4e32\u5b57\u9762\u91cf<\/h3>\n<pre><code class=\"language-javascript\">\/\/ \u5355\u5f15\u53f7\u548c\u53cc\u5f15\u53f7\u7b49\u4ef7\nlet str1 = &quot;Hello&quot;;\nlet str2 = 'Hello';\n\n\/\/ \u6a21\u677f\u5b57\u7b26\u4e32\uff08ES6\uff09\nlet name = &quot;\u5f20\u4e09&quot;;\nlet str3 = `\u4f60\u597d\uff0c${name}`;\n<\/code><\/pre>\n<h3>2. \u8f6c\u4e49\u5b57\u7b26<\/h3>\n<pre><code class=\"language-javascript\">let str1 = &quot;\u4ed6\u8bf4\uff1a\\&quot;\u4f60\u597d\\&quot;&quot;;\nlet str2 = 'It\\'s a cat';\nlet str3 = &quot;\u7b2c\u4e00\u884c\\n\u7b2c\u4e8c\u884c&quot;;  \/\/ \u6362\u884c\nlet str4 = &quot;\u8def\u5f84\uff1aC:\\\\Users&quot;;   \/\/ \u53cd\u659c\u6760\nlet str5 = &quot;\u7248\u6743\uff1a\\u00A9&quot;;      \/\/ Unicode\n<\/code><\/pre>\n<h3>3. \u957f\u5b57\u7b26\u4e32<\/h3>\n<pre><code class=\"language-javascript\">\/\/ \u4f7f\u7528 + \u8fde\u63a5\nlet longStr = &quot;\u8fd9\u662f\u7b2c\u4e00\u884c&quot; +\n             &quot;\u8fd9\u662f\u7b2c\u4e8c\u884c&quot; +\n             &quot;\u8fd9\u662f\u7b2c\u4e09\u884c&quot;;\n\n\/\/ \u4f7f\u7528\u6a21\u677f\u5b57\u7b26\u4e32\uff08\u63a8\u8350\uff09\nlet longStr2 = `\u8fd9\u662f\u7b2c\u4e00\u884c\n\u8fd9\u662f\u7b2c\u4e8c\u884c\n\u8fd9\u662f\u7b2c\u4e09\u884c`;\n<\/code><\/pre>\n<h2>\ud83d\udd0d \u5b57\u7b26\u4e32\u5c5e\u6027\u548c\u65b9\u6cd5<\/h2>\n<h3>\u57fa\u672c\u5c5e\u6027<\/h3>\n<pre><code class=\"language-javascript\">let str = &quot;Hello&quot;;\nconsole.log(str.length);      \/\/ 5\nconsole.log(str[0]);           \/\/ &quot;H&quot;\nconsole.log(str[str.length-1]); \/\/ &quot;o&quot;\n<\/code><\/pre>\n<h3>\u5927\u5c0f\u5199\u8f6c\u6362<\/h3>\n<pre><code class=\"language-javascript\">let str = &quot;Hello World&quot;;\n\nconsole.log(str.toUpperCase());  \/\/ &quot;HELLO WORLD&quot;\nconsole.log(str.toLowerCase());  \/\/ &quot;hello world&quot;\n\n\/\/ \u9996\u5b57\u6bcd\u5927\u5199\nlet capitalize = str[0].toUpperCase() + str.slice(1).toLowerCase();\nconsole.log(capitalize);       \/\/ &quot;Hello world&quot;\n<\/code><\/pre>\n<h3>\u67e5\u627e\u548c\u641c\u7d22<\/h3>\n<pre><code class=\"language-javascript\">let str = &quot;Hello World&quot;;\n\n\/\/ indexOf() - \u67e5\u627e\u4f4d\u7f6e\uff0c\u4e0d\u5b58\u5728\u8fd4\u56de -1\nconsole.log(str.indexOf(&quot;World&quot;));   \/\/ 6\nconsole.log(str.indexOf(&quot;world&quot;));   \/\/ -1\uff08\u533a\u5206\u5927\u5c0f\u5199\uff09\nconsole.log(str.indexOf(&quot;o&quot;));       \/\/ 4\uff08\u7b2c\u4e00\u4e2a\u51fa\u73b0\u7684\u4f4d\u7f6e\uff09\n\n\/\/ lastIndexOf() - \u6700\u540e\u4e00\u6b21\u51fa\u73b0\u7684\u4f4d\u7f6e\nconsole.log(str.lastIndexOf(&quot;o&quot;));    \/\/ 7\n\n\/\/ includes() - \u662f\u5426\u5305\u542b\nconsole.log(str.includes(&quot;World&quot;));  \/\/ true\nconsole.log(str.includes(&quot;world&quot;));  \/\/ false\n\n\/\/ startsWith() - \u662f\u5426\u4ee5...\u5f00\u5934\nconsole.log(str.startsWith(&quot;Hello&quot;)); \/\/ true\nconsole.log(str.startsWith(&quot;World&quot;)); \/\/ false\n\n\/\/ endsWith() - \u662f\u5426\u4ee5...\u7ed3\u5c3e\nconsole.log(str.endsWith(&quot;World&quot;));   \/\/ true\nconsole.log(str.endsWith(&quot;Hello&quot;));  \/\/ false\n\n\/\/ search() - \u652f\u6301\u6b63\u5219\u8868\u8fbe\u5f0f\nconsole.log(str.search(\/World\/i));   \/\/ 6\uff08\u5ffd\u7565\u5927\u5c0f\u5199\uff09\n<\/code><\/pre>\n<h3>\u63d0\u53d6\u548c\u622a\u53d6<\/h3>\n<pre><code class=\"language-javascript\">let str = &quot;Hello World&quot;;\n\n\/\/ charAt() - \u83b7\u53d6\u6307\u5b9a\u4f4d\u7f6e\u7684\u5b57\u7b26\nconsole.log(str.charAt(0));          \/\/ &quot;H&quot;\n\n\/\/ charCodeAt() - \u83b7\u53d6\u5b57\u7b26\u7684 Unicode \u7f16\u7801\nconsole.log(str.charCodeAt(0));      \/\/ 72\n\n\/\/ slice() - \u63d0\u53d6\u5b50\u4e32\uff08\u652f\u6301\u8d1f\u6570\uff09\nconsole.log(str.slice(0, 5));        \/\/ &quot;Hello&quot;\nconsole.log(str.slice(6));           \/\/ &quot;World&quot;\nconsole.log(str.slice(-5));          \/\/ &quot;World&quot;\nconsole.log(str.slice(0, -6));       \/\/ &quot;Hello&quot;\n\n\/\/ substring() - \u63d0\u53d6\u5b50\u4e32\uff08\u4e0d\u652f\u6301\u8d1f\u6570\uff09\nconsole.log(str.substring(0, 5));    \/\/ &quot;Hello&quot;\n\n\/\/ substr() - \u5df2\u5e9f\u5f03\uff0c\u4f7f\u7528 slice \u4ee3\u66ff\n<\/code><\/pre>\n<h3>\u66ff\u6362\u548c\u5206\u5272<\/h3>\n<pre><code class=\"language-javascript\">let str = &quot;Hello World&quot;;\n\n\/\/ replace() - \u66ff\u6362\uff08\u53ea\u66ff\u6362\u7b2c\u4e00\u4e2a\uff09\nconsole.log(str.replace(&quot;World&quot;, &quot;JavaScript&quot;)); \/\/ &quot;Hello JavaScript&quot;\n\n\/\/ replaceAll() - \u66ff\u6362\u6240\u6709\uff08ES2021\uff09\nconsole.log(str.replaceAll(&quot;l&quot;, &quot;L&quot;));          \/\/ &quot;HeLLo WorLd&quot;\n\n\/\/ \u6216\u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\u5168\u5c40\u66ff\u6362\nconsole.log(str.replace(\/l\/g, &quot;L&quot;));             \/\/ &quot;HeLLo WorLd&quot;\n\n\/\/ split() - \u5206\u5272\u5b57\u7b26\u4e32\u4e3a\u6570\u7ec4\nlet str2 = &quot;apple,banana,orange&quot;;\nconsole.log(str2.split(&quot;,&quot;));  \/\/ [&quot;apple&quot;, &quot;banana&quot;, &quot;orange&quot;]\n\n\/\/ \u6309\u7a7a\u683c\u5206\u5272\nlet str3 = &quot;Hello World JavaScript&quot;;\nconsole.log(str3.split(&quot; &quot;));   \/\/ [&quot;Hello&quot;, &quot;World&quot;, &quot;JavaScript&quot;]\n\n\/\/ \u6309\u5b57\u7b26\u5206\u5272\nconsole.log(str.split(&quot;&quot;));     \/\/ [&quot;H&quot;, &quot;e&quot;, &quot;l&quot;, &quot;l&quot;, &quot;o&quot;, &quot; &quot;, &quot;W&quot;, &quot;o&quot;, &quot;r&quot;, &quot;l&quot;, &quot;d&quot;]\n<\/code><\/pre>\n<h3>\u53bb\u9664\u7a7a\u683c<\/h3>\n<pre><code class=\"language-javascript\">let str = &quot;  Hello World  &quot;;\n\n\/\/ trim() - \u53bb\u9664\u9996\u5c3e\u7a7a\u683c\nconsole.log(str.trim());           \/\/ &quot;Hello World&quot;\n\n\/\/ trimStart() \/ trimLeft() - \u53bb\u9664\u5f00\u5934\u7a7a\u683c\nconsole.log(str.trimStart());      \/\/ &quot;Hello World  &quot;\n\n\/\/ trimEnd() \/ trimRight() - \u53bb\u9664\u5c3e\u90e8\u7a7a\u683c\nconsole.log(str.trimEnd());        \/\/ &quot;  Hello World&quot;\n\n\/\/ \u4f7f\u7528\u6b63\u5219\u53bb\u9664\u6240\u6709\u7a7a\u683c\nconsole.log(str.replace(\/\\s\/g, &quot;&quot;)); \/\/ &quot;HelloWorld&quot;\n<\/code><\/pre>\n<h3>\u91cd\u590d\u548c\u586b\u5145<\/h3>\n<pre><code class=\"language-javascript\">\/\/ repeat() - \u91cd\u590d\u5b57\u7b26\u4e32\nconsole.log(&quot;Hi&quot;.repeat(3));        \/\/ &quot;HiHiHi&quot;\n\n\/\/ padStart() - \u5f00\u5934\u586b\u5145\nconsole.log(&quot;5&quot;.padStart(2, &quot;0&quot;));  \/\/ &quot;05&quot;\nconsole.log(&quot;1&quot;.padStart(5, &quot;0&quot;));  \/\/ &quot;00001&quot;\n\n\/\/ padEnd() - \u5c3e\u90e8\u586b\u5145\nconsole.log(&quot;5&quot;.padEnd(3, &quot;.&quot;));    \/\/ &quot;5..&quot;\n\n\/\/ \u5e94\u7528\uff1a\u683c\u5f0f\u5316\u6570\u5b57\nlet num = 42;\nconsole.log(String(num).padStart(6, &quot;0&quot;));  \/\/ &quot;000042&quot;\n<\/code><\/pre>\n<h3>\u6bd4\u8f83\u5b57\u7b26\u4e32<\/h3>\n<pre><code class=\"language-javascript\">let str1 = &quot;apple&quot;;\nlet str2 = &quot;banana&quot;;\n\n\/\/ \u6309\u5b57\u5178\u5e8f\u6bd4\u8f83\nconsole.log(str1 &lt; str2);   \/\/ true\nconsole.log(&quot;a&quot; &lt; &quot;b&quot;);     \/\/ true\nconsole.log(&quot;A&quot; &lt; &quot;a&quot;);     \/\/ true\uff08\u5927\u5199\u5b57\u6bcd\u7684\u7f16\u7801\u66f4\u5c0f\uff09\n\n\/\/ localeCompare() - \u672c\u5730\u5316\u6bd4\u8f83\nconsole.log(str1.localeCompare(str2));  \/\/ -1\uff08str1 \u5728 str2 \u524d\u9762\uff09\nconsole.log(&quot;\u00e4&quot;.localeCompare(&quot;z&quot;));     \/\/ -1\uff08\u8003\u8651\u672c\u5730\u89c4\u5219\uff09\n<\/code><\/pre>\n<h2>\ud83c\udfa8 \u6a21\u677f\u5b57\u7b26\u4e32<\/h2>\n<h3>\u57fa\u672c\u7528\u6cd5<\/h3>\n<pre><code class=\"language-javascript\">let name = &quot;\u5f20\u4e09&quot;;\nlet age = 25;\n\n\/\/ \u63d2\u503c\nlet str = `\u59d3\u540d\uff1a${name}\uff0c\u5e74\u9f84\uff1a${age}`;\nconsole.log(str);  \/\/ &quot;\u59d3\u540d\uff1a\u5f20\u4e09\uff0c\u5e74\u9f84\uff1a25&quot;\n\n\/\/ \u8868\u8fbe\u5f0f\nlet a = 10, b = 20;\nconsole.log(`${a} + ${b} = ${a + b}`);  \/\/ &quot;10 + 20 = 30&quot;\n\n\/\/ \u8c03\u7528\u51fd\u6570\nfunction greet(name) {\n    return `Hello, ${name}!`;\n}\nconsole.log(`\u6d88\u606f\uff1a${greet(&quot;\u5f20\u4e09&quot;)}`);  \/\/ &quot;\u6d88\u606f\uff1aHello, \u5f20\u4e09!&quot;\n<\/code><\/pre>\n<h3>\u591a\u884c\u5b57\u7b26\u4e32<\/h3>\n<pre><code class=\"language-javascript\">\/\/ \u6a21\u677f\u5b57\u7b26\u4e32\u652f\u6301\u591a\u884c\nlet html = `\n    &lt;div&gt;\n        &lt;h1&gt;\u6807\u9898&lt;\/h1&gt;\n        &lt;p&gt;\u6bb5\u843d&lt;\/p&gt;\n    &lt;\/div&gt;\n`;\n\n\/\/ \u4f20\u7edf\u65b9\u5f0f\u9700\u8981\u7528 +\nlet html2 = &quot;&lt;div&gt;&quot; +\n            &quot;&lt;h1&gt;\u6807\u9898&lt;\/h1&gt;&quot; +\n            &quot;&lt;p&gt;\u6bb5\u843d&lt;\/p&gt;&quot; +\n            &quot;&lt;\/div&gt;&quot;;\n<\/code><\/pre>\n<h3>\u6807\u7b7e\u6a21\u677f<\/h3>\n<pre><code class=\"language-javascript\">function tag(strings, ...values) {\n    console.log(strings);  \/\/ [&quot;Hello &quot;, &quot;! &quot;, &quot;&quot;]\n    console.log(values);   \/\/ [&quot;World&quot;, &quot;JavaScript&quot;]\n    return &quot;Processed&quot;;\n}\n\nlet result = tag`Hello ${&quot;World&quot;}! ${&quot;JavaScript&quot;}`;\nconsole.log(result);  \/\/ &quot;Processed&quot;\n<\/code><\/pre>\n<h2>\ud83c\udfae \u5b9e\u6218\u793a\u4f8b<\/h2>\n<h3>\u793a\u4f8b1\uff1a\u7528\u6237\u540d\u9a8c\u8bc1<\/h3>\n<pre><code class=\"language-javascript\">function validateUsername(username) {\n    \/\/ \u53bb\u9664\u7a7a\u683c\n    username = username.trim();\n    \n    \/\/ \u68c0\u67e5\u957f\u5ea6\n    if (username.length &lt; 3 || username.length &gt; 20) {\n        return {valid: false, message: &quot;\u7528\u6237\u540d\u957f\u5ea6\u5fc5\u987b\u5728 3-20 \u4e2a\u5b57\u7b26&quot;};\n    }\n    \n    \/\/ \u68c0\u67e5\u662f\u5426\u53ea\u5305\u542b\u5b57\u6bcd\u3001\u6570\u5b57\u3001\u4e0b\u5212\u7ebf\n    if (!\/^[a-zA-Z0-9_]+$\/.test(username)) {\n        return {valid: false, message: &quot;\u7528\u6237\u540d\u53ea\u80fd\u5305\u542b\u5b57\u6bcd\u3001\u6570\u5b57\u3001\u4e0b\u5212\u7ebf&quot;};\n    }\n    \n    \/\/ \u68c0\u67e5\u662f\u5426\u4ee5\u5b57\u6bcd\u5f00\u5934\n    if (!\/^[a-zA-Z]\/.test(username)) {\n        return {valid: false, message: &quot;\u7528\u6237\u540d\u5fc5\u987b\u4ee5\u5b57\u6bcd\u5f00\u5934&quot;};\n    }\n    \n    return {valid: true};\n}\n\nconsole.log(validateUsername(&quot;user123&quot;));   \/\/ {valid: true}\nconsole.log(validateUsername(&quot;123user&quot;));   \/\/ {valid: false, message: &quot;...&quot;}\n<\/code><\/pre>\n<h3>\u793a\u4f8b2\uff1aURL \u6784\u5efa<\/h3>\n<pre><code class=\"language-javascript\">function buildURL(base, path, params) {\n    \/\/ \u53bb\u9664 base \u7684\u7ed3\u5c3e \/\n    base = base.replace(\/\\\/$\/, &quot;&quot;);\n    \n    \/\/ \u53bb\u9664 path \u7684\u5f00\u5934 \/\n    path = path.replace(\/^\\\/\/, &quot;&quot;);\n    \n    \/\/ \u6784\u5efa URL\n    let url = `${base}\/${path}`;\n    \n    \/\/ \u6dfb\u52a0\u67e5\u8be2\u53c2\u6570\n    if (params) {\n        let query = Object.keys(params)\n            .map(key =&gt; `${encodeURIComponent(key)}=${encodeURIComponent(params[key])}`)\n            .join(&quot;&amp;&quot;);\n        url += `?${query}`;\n    }\n    \n    return url;\n}\n\nconsole.log(buildURL(&quot;https:\/\/api.example.com&quot;, &quot;users&quot;, {page: 1, limit: 10}));\n\/\/ &quot;https:\/\/api.example.com\/users?page=1&amp;limit=10&quot;\n<\/code><\/pre>\n<h3>\u793a\u4f8b3\uff1a\u6587\u4ef6\u8def\u5f84\u5904\u7406<\/h3>\n<pre><code class=\"language-javascript\">function getFileName(path) {\n    \/\/ \u83b7\u53d6\u6700\u540e\u4e00\u4e2a \/ \u4e4b\u540e\u7684\u5185\u5bb9\n    return path.slice(path.lastIndexOf(&quot;\/&quot;) + 1);\n}\n\nfunction getFileExtension(filename) {\n    \/\/ \u83b7\u53d6\u6700\u540e\u4e00\u4e2a . \u4e4b\u540e\u7684\u5185\u5bb9\n    return filename.slice(filename.lastIndexOf(&quot;.&quot;) + 1);\n}\n\nfunction getFilePath(filename) {\n    \/\/ \u83b7\u53d6\u6700\u540e\u4e00\u4e2a \/ \u4e4b\u524d\u7684\u5185\u5bb9\n    return filename.slice(0, filename.lastIndexOf(&quot;\/&quot;));\n}\n\nlet path = &quot;\/home\/user\/documents\/file.txt&quot;;\nconsole.log(getFileName(path));        \/\/ &quot;file.txt&quot;\nconsole.log(getFileExtension(path));   \/\/ &quot;txt&quot;\nconsole.log(getFilePath(path));       \/\/ &quot;\/home\/user\/documents&quot;\n<\/code><\/pre>\n<h3>\u793a\u4f8b4\uff1a\u6587\u672c\u683c\u5f0f\u5316<\/h3>\n<pre><code class=\"language-javascript\">function formatText(text) {\n    \/\/ \u53bb\u9664\u9996\u5c3e\u7a7a\u683c\n    text = text.trim();\n    \n    \/\/ \u5c06\u591a\u4e2a\u8fde\u7eed\u7a7a\u683c\u66ff\u6362\u4e3a\u5355\u4e2a\u7a7a\u683c\n    text = text.replace(\/\\s+\/g, &quot; &quot;);\n    \n    \/\/ \u9996\u5b57\u6bcd\u5927\u5199\n    text = text.charAt(0).toUpperCase() + text.slice(1).toLowerCase();\n    \n    return text;\n}\n\nconsole.log(formatText(&quot;  hello    world  &quot;));  \/\/ &quot;Hello world&quot;\n<\/code><\/pre>\n<h3>\u793a\u4f8b5\uff1a\u751f\u6210\u968f\u673a\u5b57\u7b26\u4e32<\/h3>\n<pre><code class=\"language-javascript\">function generateRandomString(length, charset) {\n    let result = &quot;&quot;;\n    charset = charset || &quot;ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789&quot;;\n    \n    for (let i = 0; i &lt; length; i++) {\n        result += charset.charAt(Math.floor(Math.random() * charset.length));\n    }\n    \n    return result;\n}\n\nconsole.log(generateRandomString(10));  \/\/ &quot;aB3xY9pQ2m&quot;\nconsole.log(generateRandomString(8, &quot;ABCDEF123456&quot;));  \/\/ &quot;3D1FA6C2&quot;\n<\/code><\/pre>\n<h3>\u793a\u4f8b6\uff1a\u9a7c\u5cf0\u547d\u540d\u8f6c\u6362<\/h3>\n<pre><code class=\"language-javascript\">\/\/ \u9a7c\u5cf0\u8f6c\u77ed\u6a2a\u7ebf\nfunction camelToKebab(str) {\n    return str.replace(\/([A-Z])\/g, &quot;-$1&quot;).toLowerCase();\n}\n\n\/\/ \u77ed\u6a2a\u7ebf\u8f6c\u9a7c\u5cf0\nfunction kebabToCamel(str) {\n    return str.replace(\/-([a-z])\/g, (g) =&gt; g[1].toUpperCase());\n}\n\n\/\/ \u9a7c\u5cf0\u8f6c\u86c7\u5f62\nfunction camelToSnake(str) {\n    return str.replace(\/([A-Z])\/g, &quot;_$1&quot;).toLowerCase();\n}\n\nconsole.log(camelToKebab(&quot;backgroundColor&quot;));  \/\/ &quot;background-color&quot;\nconsole.log(kebabToCamel(&quot;background-color&quot;)); \/\/ &quot;backgroundColor&quot;\nconsole.log(camelToSnake(&quot;backgroundColor&quot;));   \/\/ &quot;background_color&quot;\n<\/code><\/pre>\n<h2>\u270d\ufe0f \u7ec3\u4e60\u4efb\u52a1<\/h2>\n<h3>\u7ec3\u4e601\uff1a\u7edf\u8ba1\u5b57\u7b26\u51fa\u73b0\u6b21\u6570<\/h3>\n<pre><code class=\"language-javascript\">function countCharacters(str) {\n    let count = {};\n    for (let char of str) {\n        count[char] = (count[char] || 0) + 1;\n    }\n    return count;\n}\n\nconsole.log(countCharacters(&quot;hello&quot;));\n\/\/ {h: 1, e: 1, l: 2, o: 1}\n<\/code><\/pre>\n<h3>\u7ec3\u4e602\uff1a\u53cd\u8f6c\u5b57\u7b26\u4e32<\/h3>\n<pre><code class=\"language-javascript\">function reverseString(str) {\n    return str.split(&quot;&quot;).reverse().join(&quot;&quot;);\n}\n\nconsole.log(reverseString(&quot;Hello&quot;));  \/\/ &quot;olleH&quot;\n<\/code><\/pre>\n<h3>\u7ec3\u4e603\uff1a\u68c0\u67e5\u56de\u6587<\/h3>\n<pre><code class=\"language-javascript\">function isPalindrome(str) {\n    \/\/ \u53bb\u9664\u7a7a\u683c\u548c\u6807\u70b9\uff0c\u8f6c\u5c0f\u5199\n    str = str.replace(\/[^a-zA-Z0-9]\/g, &quot;&quot;).toLowerCase();\n    \/\/ \u53cd\u8f6c\u6bd4\u8f83\n    return str === str.split(&quot;&quot;).reverse().join(&quot;&quot;);\n}\n\nconsole.log(isPalindrome(&quot;A man, a plan, a canal: Panama&quot;));  \/\/ true\n<\/code><\/pre>\n<h2>\ud83c\udf93 \u4eca\u65e5\u6311\u6218<\/h2>\n<p><strong>\u9879\u76ee\uff1aMarkdown \u89e3\u6790\u5668<\/strong><\/p>\n<p>\u5b9e\u73b0\u7b80\u5355\u7684 Markdown \u8f6c HTML\uff1a<\/p>\n<pre><code class=\"language-javascript\">function parseMarkdown(markdown) {\n    let html = markdown;\n    \n    # \u6807\u9898\n    html = html.replace(\/^# (.*$)\/gim, &quot;&lt;h1&gt;$1&lt;\/h1&gt;&quot;);\n    html = html.replace(\/^## (.*$)\/gim, &quot;&lt;h2&gt;$1&lt;\/h2&gt;&quot;);\n    html = html.replace(\/^### (.*$)\/gim, &quot;&lt;h3&gt;$1&lt;\/h3&gt;&quot;);\n    \n    # \u7c97\u4f53\u548c\u659c\u4f53\n    html = html.replace(\/\\*\\*(.*?)\\*\\*\/gim, &quot;&lt;b&gt;$1&lt;\/b&gt;&quot;);\n    html = html.replace(\/\\*(.*?)\\*\/gim, &quot;&lt;i&gt;$1&lt;\/i&gt;&quot;);\n    \n    # \u4ee3\u7801\n    html = html.replace(\/`([^`]+)`\/gim, &quot;&lt;code&gt;$1&lt;\/code&gt;&quot;);\n    \n    # \u94fe\u63a5\n    html = html.replace(\/\\[([^\\]]+)\\]\\(([^)]+)\\)\/gim, &quot;&lt;a href='$2'&gt;$1&lt;\/a&gt;&quot;);\n    \n    return html;\n}\n\nconsole.log(parseMarkdown(&quot;# Hello\\n\u8fd9\u662f **\u7c97\u4f53** \u548c *\u659c\u4f53*&quot;));\n<\/code><\/pre>\n<h2>\ud83d\udca1 \u6700\u4f73\u5b9e\u8df5<\/h2>\n<h3>1. \u4f18\u5148\u4f7f\u7528\u6a21\u677f\u5b57\u7b26\u4e32<\/h3>\n<pre><code class=\"language-javascript\">\/\/ \u2705 \u597d\nlet str = `Hello ${name}`;\n\n\/\/ \u274c \u5dee\nlet str = &quot;Hello &quot; + name;\n<\/code><\/pre>\n<h3>2. \u907f\u514d\u5728\u5faa\u73af\u4e2d\u62fc\u63a5\u5b57\u7b26\u4e32<\/h3>\n<pre><code class=\"language-javascript\">\/\/ \u274c \u4e0d\u597d\uff08\u6bcf\u6b21\u521b\u5efa\u65b0\u5b57\u7b26\u4e32\uff09\nlet str = &quot;&quot;;\nfor (let i = 0; i &lt; 1000; i++) {\n    str += i;\n}\n\n\/\/ \u2705 \u597d\u7528\u6570\u7ec4\nlet parts = [];\nfor (let i = 0; i &lt; 1000; i++) {\n    parts.push(i);\n}\nlet str = parts.join(&quot;&quot;);\n<\/code><\/pre>\n<h3>3. \u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\u5904\u7406\u590d\u6742\u6a21\u5f0f<\/h3>\n<pre><code class=\"language-javascript\">\/\/ \u9a8c\u8bc1\u90ae\u7bb1\nfunction isValidEmail(email) {\n    return \/^[^\\s@]+@[^\\s@]+\\.[^\\s@]+$\/.test(email);\n}\n<\/code><\/pre>\n<hr>\n<p><strong>\u5b66\u4e60\u65f6\u95f4<\/strong>: 2026-03-08 03:05<br \/>\n<strong>\u96be\u5ea6<\/strong>: \u2b50\u2b50\u2b50\u2606\u2606<br \/>\n<strong>\u9884\u8ba1\u7528\u65f6<\/strong>: 2-3 \u5c0f\u65f6<br \/>\n<strong>\u5173\u952e\u8bcd<\/strong>: \u5b57\u7b26\u4e32, \u6a21\u677f\u5b57\u7b26\u4e32, \u6b63\u5219\u8868\u8fbe\u5f0f<br \/>\n<strong>\u76f8\u5173\u6807\u7b7e<\/strong>: #05-\u5b57\u7b26\u4e32<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Day 7: \u5b57\u7b26\u4e32\u64cd\u4f5c \ud83c\udfaf \u5b66\u4e60\u76ee\u6807 \u638c\u63e1\u5b57\u7b26\u4e32\u7684\u521b\u5efa\u548c\u57fa\u672c\u64cd\u4f5c \u5b66\u4f1a\u4f7f\u7528\u5b57\u7b26\u4e32\u65b9\u6cd5\u8fdb\u884c\u8f6c\u6362\u548c\u67e5\u627e \u7406\u89e3\u5b57\u7b26 &#8230; <a title=\"Day-7-\u5b57\u7b26\u4e32\u64cd\u4f5c\" class=\"read-more\" href=\"https:\/\/www.resilence.cn\/?p=239\" aria-label=\"\u7ee7\u7eed\u9605\u8bfbDay-7-\u5b57\u7b26\u4e32\u64cd\u4f5c\">\u9605\u8bfb\u66f4\u591a<\/a><\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-239","post","type-post","status-publish","format-standard","hentry","category-studycoding"],"_links":{"self":[{"href":"https:\/\/www.resilence.cn\/index.php?rest_route=\/wp\/v2\/posts\/239","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.resilence.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.resilence.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.resilence.cn\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.resilence.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=239"}],"version-history":[{"count":1,"href":"https:\/\/www.resilence.cn\/index.php?rest_route=\/wp\/v2\/posts\/239\/revisions"}],"predecessor-version":[{"id":240,"href":"https:\/\/www.resilence.cn\/index.php?rest_route=\/wp\/v2\/posts\/239\/revisions\/240"}],"wp:attachment":[{"href":"https:\/\/www.resilence.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=239"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.resilence.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=239"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.resilence.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=239"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}