Docs: Update 'File Read and Write' and 'Class and Object' Sections for Clarity and Accuracy (#41)

* Docs: Update read-and-write-files.md

* Docs: Update class-and-instance.md

Author: baekilda

docs/class-and-instance.md

@@ -42,7 +42,7 @@ console.log(circle.getArea()); // 78.53981633974483
 console.log(circle.getCircumference()); // 31.41592653589793
 ```
 :::tip
-The `static` keyword in the class is not native to JavaScript, but a feature provided by TypeScript. In addition to `static`, TypeScript also provides access modifiers such as `public`, `private`, and `protected`.
+The `static` keyword in classes is a feature provided by TypeScript, but starting from ES2022, it has been [natively supported](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Classes/static) in JavaScript. In addition, TypeScript also provides access modifiers such as `public`, `private`, and `protected`.
 :::
 
 #### Python implementation

docs/read-and-write-files.md

@@ -22,12 +22,11 @@ const missingClassics = classics.filter(classic => !books.includes(classic));
 
 if (missingClassics.length === 0) {
     console.log('The file already contains the four great classical novels of China.');
-    return;
+} else {
+    const missingClassicsText = missingClassics.join('\n');
+    fs.appendFileSync('books.txt', `\n${missingClassicsText}`, 'utf8');
+    console.log(`The missing novels have been added to the file: ${missingClassicsText}`);
 }
-
-const missingClassicsText = missingClassics.join('\n');
-fs.appendFileSync('books.txt', `\n${missingClassicsText}`, 'utf8');
-console.log(`The missing novels have been added to the file: ${missingClassicsText}`);
 ```
 
 #### Python implementation

i18n/zh-cn/docusaurus-plugin-content-docs/current/class-and-instance.md

@@ -42,7 +42,7 @@ console.log(circle.getArea()); // 78.53981633974483
 console.log(circle.getCircumference()); // 31.41592653589793
 ```
 :::tip
-class 中的 `static` 关键字并非 JavaScript 原生支持的，而是由 TypeScript 提供的特性，除此之外还提供了 `public`、`private`、`protected` 访问修饰符。
+class 中的 `static` 关键字原来是 TypeScript 提供的特性，但从 ES2022 起已经在JavaScript中[原生支持](https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Classes/static)了。 除此之外，TypeScript 还提供了 `public`、`private`、`protected` 访问修饰符。
 :::
 
 #### Python 实现

i18n/zh-cn/docusaurus-plugin-content-docs/current/read-and-write-files.md

@@ -22,12 +22,11 @@ const missingClassics = classics.filter(classic => !books.includes(classic));
 
 if (missingClassics.length === 0) {
     console.log('文件中已包含中国四大名著。');
-    return;
+} else {
+    const missingClassicsText = missingClassics.join('\n');
+    fs.appendFileSync('books.txt', `\n${missingClassicsText}`, 'utf8');
+    console.log(`已补充缺失的名著到文件中: ${missingClassicsText}`);
 }
-
-const missingClassicsText = missingClassics.join('\n');
-fs.appendFileSync('books.txt', `\n${missingClassicsText}`, 'utf8');
-console.log(`已补充缺失的名著到文件中: ${missingClassicsText}`);
 ```
 
 #### Python 实现