{"id":221,"date":"2026-03-07T23:50:32","date_gmt":"2026-03-07T15:50:32","guid":{"rendered":"https:\/\/www.resilence.cn\/?p=221"},"modified":"2026-03-07T23:50:32","modified_gmt":"2026-03-07T15:50:32","slug":"day-2-%e5%8f%98%e9%87%8f%e4%b8%8e%e6%95%b0%e6%8d%ae","status":"publish","type":"post","link":"https:\/\/www.resilence.cn\/?p=221","title":{"rendered":"Day-2-\u53d8\u91cf\u4e0e\u6570\u636e"},"content":{"rendered":"<h1>Day 2: \u53d8\u91cf\u4e0e\u6570\u636e<\/h1>\n<h2>\ud83c\udfaf \u5b66\u4e60\u76ee\u6807<\/h2>\n<ul>\n<li>\u7406\u89e3\u53d8\u91cf\u7684\u6982\u5ff5\u548c\u4f5c\u7528<\/li>\n<li>\u638c\u63e1 JavaScript \u7684\u57fa\u672c\u6570\u636e\u7c7b\u578b<\/li>\n<li>\u5b66\u4f1a\u58f0\u660e\u548c\u4f7f\u7528\u53d8\u91cf<\/li>\n<li>\u7406\u89e3\u53d8\u91cf\u4f5c\u7528\u57df<\/li>\n<\/ul>\n<h2>\ud83d\udca1 \u6838\u5fc3\u6982\u5ff5<\/h2>\n<h3>\u4ec0\u4e48\u662f\u53d8\u91cf\uff1f<\/h3>\n<p>\u53d8\u91cf\u662f\u5b58\u50a8\u6570\u636e\u7684\u5bb9\u5668\u3002\u53ef\u4ee5\u628a\u53d8\u91cf\u60f3\u8c61\u6210\u4e00\u4e2a\u76d2\u5b50\uff0c\u76d2\u5b50\u4e0a\u6709\u6807\u7b7e\uff08\u53d8\u91cf\u540d\uff09\uff0c\u91cc\u9762\u88c5\u7740\u6570\u636e\uff08\u503c\uff09\u3002<\/p>\n<pre><code class=\"language-javascript\">\/\/ \u58f0\u660e\u4e00\u4e2a\u53d8\u91cf\nlet name = &quot;\u5f20\u4e09&quot;;\n\n\/\/ name \u662f\u53d8\u91cf\u540d\uff08\u76d2\u5b50\u4e0a\u7684\u6807\u7b7e\uff09\n\/\/ &quot;\u5f20\u4e09&quot; \u662f\u53d8\u91cf\u503c\uff08\u76d2\u5b50\u91cc\u7684\u5185\u5bb9\uff09\n<\/code><\/pre>\n<h3>\u4e3a\u4ec0\u4e48\u9700\u8981\u53d8\u91cf\uff1f<\/h3>\n<p><strong>\u6ca1\u6709\u53d8\u91cf\u7684\u4e16\u754c<\/strong>\uff1a<\/p>\n<pre><code class=\"language-javascript\">console.log(&quot;\u6b22\u8fce\uff0c\u5f20\u4e09\uff01&quot;);\nconsole.log(&quot;\u4f60\u597d\uff0c\u5f20\u4e09\uff0c\u4eca\u5929\u5929\u6c14\u4e0d\u9519&quot;);\nconsole.log(&quot;\u5f20\u4e09\uff0c\u4f60\u67093\u6761\u65b0\u6d88\u606f&quot;);\n\/\/ \u5982\u679c\u8981\u6539\u540d\uff0c\u9700\u8981\u4fee\u6539\u6240\u6709\u5730\u65b9...\n<\/code><\/pre>\n<p><strong>\u6709\u53d8\u91cf\u7684\u4e16\u754c<\/strong>\uff1a<\/p>\n<pre><code class=\"language-javascript\">let name = &quot;\u5f20\u4e09&quot;;\nconsole.log(`\u6b22\u8fce\uff0c${name}\uff01`);\nconsole.log(`\u4f60\u597d\uff0c${name}\uff0c\u4eca\u5929\u5929\u6c14\u4e0d\u9519`);\nconsole.log(`${name}\uff0c\u4f60\u67093\u6761\u65b0\u6d88\u606f`);\n\n\/\/ \u6539\u540d\u53ea\u9700\u8981\u6539\u4e00\u5904\nname = &quot;\u674e\u56db&quot;;\n<\/code><\/pre>\n<h2>\ud83d\udce6 \u58f0\u660e\u53d8\u91cf<\/h2>\n<h3>1. let\uff08\u73b0\u4ee3\u63a8\u8350\uff09<\/h3>\n<pre><code class=\"language-javascript\">let age = 25;\nage = 26;  \/\/ \u53ef\u4ee5\u91cd\u65b0\u8d4b\u503c\n\nlet score;\nscore = 100;  \/\/ \u53ef\u4ee5\u5148\u58f0\u660e\u540e\u8d4b\u503c\n<\/code><\/pre>\n<h3>2. const\uff08\u5e38\u91cf\uff09<\/h3>\n<pre><code class=\"language-javascript\">const PI = 3.14159;\n\/\/ PI = 3.14;  \/\/ \u274c \u9519\u8bef\uff01\u5e38\u91cf\u4e0d\u80fd\u91cd\u65b0\u8d4b\u503c\n\nconst user = {\n    name: &quot;Alice&quot;\n};\nuser.name = &quot;Bob&quot;;  \/\/ \u2705 \u53ef\u4ee5\u4fee\u6539\u5bf9\u8c61\u5c5e\u6027\n<\/code><\/pre>\n<h3>3. var\uff08\u65e7\u65b9\u5f0f\uff0c\u4e0d\u63a8\u8350\uff09<\/h3>\n<pre><code class=\"language-javascript\">var old = &quot;\u65e7\u65b9\u5f0f&quot;;\n\/\/ \u5b58\u5728\u53d8\u91cf\u63d0\u5347\u7b49\u95ee\u9898\uff0c\u73b0\u4ee3\u4ee3\u7801\u63a8\u8350\u7528 let \u548c const\n<\/code><\/pre>\n<h2>\ud83d\udd22 \u6570\u636e\u7c7b\u578b<\/h2>\n<h3>1. \u57fa\u672c\u7c7b\u578b<\/h3>\n<h4>\u6570\u5b57\uff08Number\uff09<\/h4>\n<pre><code class=\"language-javascript\">let age = 25;\nlet price = 99.9;\nlet negative = -10;\n\n\/\/ \u6570\u5b66\u8fd0\u7b97\nlet sum = 10 + 5;        \/\/ 15\nlet product = 3 * 4;     \/\/ 12\nlet division = 10 \/ 3;   \/\/ 3.333...\n\n\/\/ \u7279\u6b8a\u503c\nlet infinity = Infinity;   \/\/ \u65e0\u7a77\u5927\nlet nan = NaN;            \/\/ Not a Number\n<\/code><\/pre>\n<h4>\u5b57\u7b26\u4e32\uff08String\uff09<\/h4>\n<pre><code class=\"language-javascript\">let name = &quot;\u5f20\u4e09&quot;;\nlet message = 'Hello';\nlet template = `\u4f60\u597d\uff0c${name}`;  \/\/ \u6a21\u677f\u5b57\u7b26\u4e32\n\n\/\/ \u5b57\u7b26\u4e32\u65b9\u6cd5\nconsole.log(name.length);         \/\/ 2\nconsole.log(name.toUpperCase());  \/\/ &quot;\u5f20\u4e09&quot;\nconsole.log(message.includes(&quot;el&quot;)); \/\/ true\n<\/code><\/pre>\n<h4>\u5e03\u5c14\u503c\uff08Boolean\uff09<\/h4>\n<pre><code class=\"language-javascript\">let isTrue = true;\nlet isFalse = false;\n\n\/\/ \u6bd4\u8f83\u8fd0\u7b97\u8fd4\u56de\u5e03\u5c14\u503c\nlet check = 10 &gt; 5;  \/\/ true\nlet equal = 5 === 5; \/\/ true\n<\/code><\/pre>\n<h4>\u7a7a\u503c<\/h4>\n<pre><code class=\"language-javascript\">let empty = null;        \/\/ \u7a7a\u503c\nlet notDefined;          \/\/ undefined\nlet alsoUndefined = undefined;\n<\/code><\/pre>\n<h3>2. \u5f15\u7528\u7c7b\u578b<\/h3>\n<h4>\u6570\u7ec4\uff08Array\uff09<\/h4>\n<pre><code class=\"language-javascript\">let fruits = [&quot;\u82f9\u679c&quot;, &quot;\u9999\u8549&quot;, &quot;\u6a59\u5b50&quot;];\nlet numbers = [1, 2, 3, 4, 5];\nlet mixed = [1, &quot;\u4f60\u597d&quot;, true, null];\n\n\/\/ \u8bbf\u95ee\u6570\u7ec4\u5143\u7d20\nconsole.log(fruits[0]);  \/\/ &quot;\u82f9\u679c&quot;\n\n\/\/ \u6570\u7ec4\u957f\u5ea6\nconsole.log(fruits.length);  \/\/ 3\n<\/code><\/pre>\n<h4>\u5bf9\u8c61\uff08Object\uff09<\/h4>\n<pre><code class=\"language-javascript\">let person = {\n    name: &quot;\u5f20\u4e09&quot;,\n    age: 25,\n    city: &quot;\u5317\u4eac&quot;\n};\n\n\/\/ \u8bbf\u95ee\u5c5e\u6027\nconsole.log(person.name);        \/\/ &quot;\u5f20\u4e09&quot;\nconsole.log(person[&quot;age&quot;]);      \/\/ 25\n\n\/\/ \u6dfb\u52a0\/\u4fee\u6539\u5c5e\u6027\nperson.email = &quot;zhang@example.com&quot;;\nperson.age = 26;\n<\/code><\/pre>\n<h2>\ud83c\udfae \u53d8\u91cf\u547d\u540d\u89c4\u5219<\/h2>\n<h3>\u547d\u540d\u89c4\u5219<\/h3>\n<pre><code class=\"language-javascript\">\/\/ \u2705 \u597d\u7684\u547d\u540d\nlet userName = &quot;alice&quot;;\nlet isLoggedIn = true;\nlet maxCount = 100;\n\n\/\/ \u274c \u4e0d\u597d\u7684\u547d\u540d\nlet x = &quot;alice&quot;;           \/\/ \u4e0d\u660e\u786e\nlet name1 = &quot;alice&quot;;        \/\/ \u6570\u5b57\u540e\u7f00\nlet User = &quot;alice&quot;;         \/\/ \u5927\u5199\u5f00\u5934\uff08\u7559\u7ed9\u7c7b\uff09\nlet \u7528\u6237\u540d = &quot;alice&quot;;       \/\/ \u4e2d\u6587\uff08\u867d\u7136\u652f\u6301\u4f46\u4e0d\u63a8\u8350\uff09\n<\/code><\/pre>\n<h3>\u547d\u540d\u7ea6\u5b9a<\/h3>\n<h4>1. camelCase\uff08\u5c0f\u9a7c\u5cf0\uff09<\/h4>\n<pre><code class=\"language-javascript\">let firstName = &quot;\u5f20&quot;;\nlet lastName = &quot;\u4e09&quot;;\nlet isLoggedIn = false;\n<\/code><\/pre>\n<h4>2. \u5e38\u91cf\u7528 UPPER_SNAKE_CASE<\/h4>\n<pre><code class=\"language-javascript\">const MAX_RETRY_COUNT = 3;\nconst API_BASE_URL = &quot;https:\/\/api.example.com&quot;;\nconst DEFAULT_TIMEOUT = 5000;\n<\/code><\/pre>\n<h4>3. \u5e03\u5c14\u503c\u7528 is\/has\/can \u5f00\u5934<\/h4>\n<pre><code class=\"language-javascript\">let isActive = true;\nlet hasPermission = false;\nlet canEdit = true;\n<\/code><\/pre>\n<h2>\ud83d\udd04 \u7c7b\u578b\u8f6c\u6362<\/h2>\n<h3>\u81ea\u52a8\u8f6c\u6362<\/h3>\n<pre><code class=\"language-javascript\">\/\/ \u6570\u5b57 + \u5b57\u7b26\u4e32 = \u5b57\u7b26\u4e32\nlet result = 10 + &quot;20&quot;;  \/\/ &quot;1020&quot;\n\n\/\/ \u6570\u5b57 - \u5b57\u7b26\u4e32 = \u6570\u5b57\nlet result2 = 10 - &quot;2&quot;;  \/\/ 8\n\n\/\/ \u5e03\u5c14\u503c\u8f6c\u6362\nlet num = true + 1;      \/\/ 2\nlet text = false + &quot;abc&quot;; \/\/ &quot;falseabc&quot;\n<\/code><\/pre>\n<h3>\u624b\u52a8\u8f6c\u6362<\/h3>\n<pre><code class=\"language-javascript\">\/\/ \u8f6c\u5b57\u7b26\u4e32\nlet num = 123;\nString(num);       \/\/ &quot;123&quot;\nnum.toString();    \/\/ &quot;123&quot;\nnum + &quot;&quot;;          \/\/ &quot;123&quot;\n\n\/\/ \u8f6c\u6570\u5b57\nlet str = &quot;123&quot;;\nNumber(str);       \/\/ 123\nparseInt(str);     \/\/ 123\nparseFloat(&quot;3.14&quot;); \/\/ 3.14\n\n\/\/ \u8f6c\u5e03\u5c14\nBoolean(0);        \/\/ false\nBoolean(1);        \/\/ true\nBoolean(&quot;&quot;);       \/\/ false\nBoolean(&quot;hello&quot;);  \/\/ true\n<\/code><\/pre>\n<h2>\ud83e\uddea \u68c0\u67e5\u7c7b\u578b<\/h2>\n<pre><code class=\"language-javascript\">\/\/ typeof \u64cd\u4f5c\u7b26\ntypeof 42;           \/\/ &quot;number&quot;\ntypeof &quot;hello&quot;;      \/\/ &quot;string&quot;\ntypeof true;         \/\/ &quot;boolean&quot;\ntypeof undefined;    \/\/ &quot;undefined&quot;\ntypeof null;         \/\/ &quot;object&quot; (\u5386\u53f2\u9057\u7559\u95ee\u9898)\ntypeof [1,2,3];      \/\/ &quot;object&quot;\ntypeof {};           \/\/ &quot;object&quot;\n\n\/\/ \u66f4\u7cbe\u786e\u7684\u7c7b\u578b\u68c0\u67e5\nArray.isArray([1,2,3]);  \/\/ true\nArray.isArray({});       \/\/ false\n\n\/\/ \u68c0\u67e5 null\nlet value = null;\nvalue === null;          \/\/ true\n<\/code><\/pre>\n<h2>\ud83c\udfaf \u5b9e\u6218\u793a\u4f8b<\/h2>\n<h3>\u793a\u4f8b1\uff1a\u8ba1\u7b97\u5668<\/h3>\n<pre><code class=\"language-javascript\">\/\/ \u4f7f\u7528\u53d8\u91cf\u5b58\u50a8\u8f93\u5165\u548c\u7ed3\u679c\nlet num1 = 10;\nlet num2 = 5;\nlet operator = &quot;+&quot;;\n\nlet result;\nif (operator === &quot;+&quot;) {\n    result = num1 + num2;\n} else if (operator === &quot;-&quot;) {\n    result = num1 - num2;\n}\nconsole.log(`${num1} ${operator} ${num2} = ${result}`);\n<\/code><\/pre>\n<h3>\u793a\u4f8b2\uff1a\u7528\u6237\u4fe1\u606f\u7ba1\u7406<\/h3>\n<pre><code class=\"language-javascript\">\/\/ \u4f7f\u7528\u5bf9\u8c61\u5b58\u50a8\u7528\u6237\u4fe1\u606f\nlet user = {\n    name: &quot;\u5f20\u4e09&quot;,\n    age: 25,\n    email: &quot;zhang@example.com&quot;,\n    isAdmin: false\n};\n\n\/\/ \u66f4\u65b0\u7528\u6237\u4fe1\u606f\nuser.age = 26;\nuser.isAdmin = true;\n\n\/\/ \u663e\u793a\u7528\u6237\u4fe1\u606f\nconsole.log(`\u7528\u6237: ${user.name}`);\nconsole.log(`\u5e74\u9f84: ${user.age}`);\nconsole.log(`\u7ba1\u7406\u5458: ${user.isAdmin ? &quot;\u662f&quot; : &quot;\u5426&quot;}`);\n<\/code><\/pre>\n<h3>\u793a\u4f8b3\uff1a\u8d2d\u7269\u8f66<\/h3>\n<pre><code class=\"language-javascript\">\/\/ \u4f7f\u7528\u6570\u7ec4\u5b58\u50a8\u5546\u54c1\nlet cart = [\n    {name: &quot;\u82f9\u679c&quot;, price: 5.5, quantity: 2},\n    {name: &quot;\u9999\u8549&quot;, price: 3.0, quantity: 3},\n    {name: &quot;\u6a59\u5b50&quot;, price: 4.0, quantity: 1}\n];\n\n\/\/ \u8ba1\u7b97\u603b\u4ef7\nlet total = 0;\nfor (let item of cart) {\n    total += item.price * item.quantity;\n}\nconsole.log(`\u603b\u4ef7: \u00a5${total.toFixed(2)}`);\n<\/code><\/pre>\n<h2>\u26a0\ufe0f \u5e38\u89c1\u9519\u8bef<\/h2>\n<h3>1. \u53d8\u91cf\u540d\u62fc\u5199\u9519\u8bef<\/h3>\n<pre><code class=\"language-javascript\">let userName = &quot;Alice&quot;;\nconsole.log(username);  \/\/ \u274c ReferenceError: username is not defined\n<\/code><\/pre>\n<h3>2. \u4f7f\u7528 const \u91cd\u65b0\u8d4b\u503c<\/h3>\n<pre><code class=\"language-javascript\">const PI = 3.14;\nPI = 3.14159;  \/\/ \u274c TypeError: Assignment to constant variable\n<\/code><\/pre>\n<h3>3. \u6df7\u6dc6 == \u548c ===<\/h3>\n<pre><code class=\"language-javascript\">console.log(5 == &quot;5&quot;);   \/\/ true  (\u81ea\u52a8\u7c7b\u578b\u8f6c\u6362)\nconsole.log(5 === &quot;5&quot;);  \/\/ false (\u4e25\u683c\u6bd4\u8f83)\n\/\/ \u603b\u662f\u4f7f\u7528 ===\n<\/code><\/pre>\n<h3>4. var \u7684\u53d8\u91cf\u63d0\u5347<\/h3>\n<pre><code class=\"language-javascript\">console.log(x);  \/\/ undefined (\u4e0d\u662f\u9519\u8bef)\nvar x = 10;\n\/\/ \u4f7f\u7528 let \u907f\u514d\nconsole.log(y);  \/\/ ReferenceError\nlet y = 10;\n<\/code><\/pre>\n<h2>\u270d\ufe0f \u7ec3\u4e60\u4efb\u52a1<\/h2>\n<h3>\u7ec3\u4e601\uff1a\u53d8\u91cf\u4ea4\u6362<\/h3>\n<p>\u4e0d\u4f7f\u7528\u7b2c\u4e09\u4e2a\u53d8\u91cf\uff0c\u4ea4\u6362\u4e24\u4e2a\u53d8\u91cf\u7684\u503c\u3002<\/p>\n<pre><code class=\"language-javascript\">let a = 5;\nlet b = 10;\n\n\/\/ \u4f60\u7684\u4ee3\u7801\n\/\/ ...\n\nconsole.log(a); \/\/ \u5e94\u8be5\u8f93\u51fa 10\nconsole.log(b); \/\/ \u5e94\u8be5\u8f93\u51fa 5\n<\/code><\/pre>\n<p><strong>\u63d0\u793a<\/strong>\uff1a\u4f7f\u7528\u89e3\u6784\u8d4b\u503c\u6216\u6570\u5b66\u8fd0\u7b97<\/p>\n<h3>\u7ec3\u4e602\uff1a\u6e29\u5ea6\u8f6c\u6362\u5668<\/h3>\n<p>\u521b\u5efa\u53d8\u91cf\u5b58\u50a8\u6444\u6c0f\u5ea6\uff0c\u8f6c\u6362\u6210\u534e\u6c0f\u5ea6\u3002<\/p>\n<pre><code class=\"language-javascript\">let celsius = 25;\nlet fahrenheit = celsius * 9 \/ 5 + 32;\nconsole.log(`${celsius}\u00b0C = ${fahrenheit}\u00b0F`);\n<\/code><\/pre>\n<h3>\u7ec3\u4e603\uff1a\u4e2a\u4eba\u4fe1\u606f\u5361\u7247<\/h3>\n<p>\u4f7f\u7528\u5bf9\u8c61\u5b58\u50a8\u4e2a\u4eba\u4fe1\u606f\uff0c\u7136\u540e\u6253\u5370\u683c\u5f0f\u5316\u7684\u4fe1\u606f\u3002<\/p>\n<pre><code class=\"language-javascript\">let person = {\n    name: &quot;\u4f60\u7684\u540d\u5b57&quot;,\n    age: 25,\n    city: &quot;\u4f60\u7684\u57ce\u5e02&quot;,\n    hobby: [&quot;\u9605\u8bfb&quot;, &quot;\u6e38\u620f&quot;, &quot;\u8fd0\u52a8&quot;]\n};\n\n\/\/ \u6253\u5370\u5982\u4e0b\u683c\u5f0f\uff1a\n\/\/ \u59d3\u540d: XXX\n\/\/ \u5e74\u9f84: XX\u5c81\n\/\/ \u57ce\u5e02: XXX\n\/\/ \u7231\u597d: XXX\u3001XXX\u3001XXX\n<\/code><\/pre>\n<h2>\ud83c\udf93 \u4eca\u65e5\u6311\u6218<\/h2>\n<p><strong>\u9879\u76ee\uff1a\u5b66\u751f\u6210\u7ee9\u7ba1\u7406\u7cfb\u7edf<\/strong><\/p>\n<p>\u4f7f\u7528\u53d8\u91cf\u548c\u6570\u636e\u7ed3\u6784\u5b9e\u73b0\uff1a<\/p>\n<ol>\n<li>\n<p><strong>\u5b66\u751f\u4fe1\u606f<\/strong><\/p>\n<ul>\n<li>\u59d3\u540d<\/li>\n<li>\u5b66\u53f7<\/li>\n<li>\u6210\u7ee9\u5217\u8868<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>\u529f\u80fd\u5b9e\u73b0<\/strong><\/p>\n<ul>\n<li>\u8ba1\u7b97\u5e73\u5747\u5206<\/li>\n<li>\u627e\u51fa\u6700\u9ad8\u5206<\/li>\n<li>\u5224\u65ad\u662f\u5426\u53ca\u683c\uff0860\u5206\u4ee5\u4e0a\uff09<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>\u6570\u636e\u8f93\u51fa<\/strong><\/p>\n<ul>\n<li>\u683c\u5f0f\u5316\u663e\u793a\u5b66\u751f\u4fe1\u606f<\/li>\n<li>\u663e\u793a\u6210\u7ee9\u7edf\u8ba1<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<pre><code class=\"language-javascript\">\/\/ \u63d0\u793a\uff1a\u4f7f\u7528\u6570\u7ec4\u548c\u5bf9\u8c61\nlet student = {\n    name: &quot;\u5f20\u4e09&quot;,\n    id: &quot;2024001&quot;,\n    scores: {\n        chinese: 85,\n        math: 90,\n        english: 78\n    }\n};\n\n\/\/ \u5b9e\u73b0\u4ee5\u4e0b\u51fd\u6570\uff1a\nfunction calculateAverage(scores) { }\nfunction findMaxScore(scores) { }\nfunction isPassing(scores) { }\nfunction printReport(student) { }\n<\/code><\/pre>\n<h2>\ud83d\udca1 \u6700\u4f73\u5b9e\u8df5<\/h2>\n<h3>1. \u4f18\u5148\u4f7f\u7528 const<\/h3>\n<p>\u5982\u679c\u4e0d\u9700\u8981\u91cd\u65b0\u8d4b\u503c\uff0c\u4f7f\u7528 const\u3002<\/p>\n<h3>2. \u53d8\u91cf\u540d\u8981\u8bed\u4e49\u5316<\/h3>\n<pre><code class=\"language-javascript\">\/\/ \u2705 \u597d\nlet daysUntilDeadline = 7;\n\n\/\/ \u274c \u5dee\nlet d = 7;\n<\/code><\/pre>\n<h3>3. \u907f\u514d\u5168\u5c40\u53d8\u91cf<\/h3>\n<pre><code class=\"language-javascript\">\/\/ \u274c \u5dee\nlet globalData = &quot;...&quot;;\n\n\/\/ \u2705 \u597d\nfunction processData() {\n    let localData = &quot;...&quot;;\n}\n<\/code><\/pre>\n<h3>4. \u53ca\u65f6\u91ca\u653e\u4e0d\u9700\u8981\u7684\u53d8\u91cf<\/h3>\n<pre><code class=\"language-javascript\">let largeData = fetchLargeData();\nprocess(largeData);\nlargeData = null;  \/\/ \u91ca\u653e\u5185\u5b58\n<\/code><\/pre>\n<hr>\n<p><strong>\u5b66\u4e60\u65f6\u95f4<\/strong>: 2026-03-07 13:25<br \/>\n<strong>\u96be\u5ea6<\/strong>: \u2b50\u2b50\u2606\u2606\u2606<br \/>\n<strong>\u9884\u8ba1\u7528\u65f6<\/strong>: 2-3 \u5c0f\u65f6<br \/>\n<strong>\u5173\u952e\u8bcd<\/strong>: \u53d8\u91cf, \u6570\u636e\u7c7b\u578b, let, const, \u5bf9\u8c61, \u6570\u7ec4<br \/>\n<strong>\u76f8\u5173\u6807\u7b7e<\/strong>: #02-\u53d8\u91cf\u4e0e\u6570\u636e<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Day 2: \u53d8\u91cf\u4e0e\u6570\u636e \ud83c\udfaf \u5b66\u4e60\u76ee\u6807 \u7406\u89e3\u53d8\u91cf\u7684\u6982\u5ff5\u548c\u4f5c\u7528 \u638c\u63e1 JavaScript \u7684\u57fa\u672c\u6570\u636e\u7c7b\u578b \u5b66\u4f1a &#8230; <a title=\"Day-2-\u53d8\u91cf\u4e0e\u6570\u636e\" class=\"read-more\" href=\"https:\/\/www.resilence.cn\/?p=221\" aria-label=\"\u7ee7\u7eed\u9605\u8bfbDay-2-\u53d8\u91cf\u4e0e\u6570\u636e\">\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-221","post","type-post","status-publish","format-standard","hentry","category-studycoding"],"_links":{"self":[{"href":"https:\/\/www.resilence.cn\/index.php?rest_route=\/wp\/v2\/posts\/221","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=221"}],"version-history":[{"count":1,"href":"https:\/\/www.resilence.cn\/index.php?rest_route=\/wp\/v2\/posts\/221\/revisions"}],"predecessor-version":[{"id":222,"href":"https:\/\/www.resilence.cn\/index.php?rest_route=\/wp\/v2\/posts\/221\/revisions\/222"}],"wp:attachment":[{"href":"https:\/\/www.resilence.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=221"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.resilence.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=221"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.resilence.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=221"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}