ADD file via upload

App.js

@@ -0,0 +1,141 @@
+import React, { useState } from 'react';
+import './App.css'; // 确保你有样式文件
+
+// 学生列表组件
+const StudentList = ({ students }) => (
+  <ul>
+    {students.map((student, index) => (
+      <li key={index}>
+        {student.name} - 积分: {student.points}
+      </li>
+    ))}
+  </ul>
+);
+
+// 随机选择组件
+const RandomSelector = ({ students, onSelect }) => {
+  const selectRandomStudent = () => {
+    if (students.length === 0) return;
+
+    // 根据积分降低被选中概率
+    const totalPoints = students.reduce((acc, student) => acc + Math.max(student.points, 0), 0);
+    const weightedStudents = students.flatMap(student => Array(Math.max(1, 10 - student.points)).fill(student));
+    const randomIndex = Math.floor(Math.random() * weightedStudents.length);
+    const selectedStudent = weightedStudents[randomIndex];
+
+    if (typeof onSelect === 'function') {
+      onSelect(selectedStudent);
+    }
+  };
+
+  return (
+    <div>
+      <button onClick={selectRandomStudent}>随机选择学生</button>
+    </div>
+  );
+};
+
+// 主应用组件
+const App = () => {
+  const [students, setStudents] = useState([]);
+  const [isCalling, setIsCalling] = useState(false);
+  const [selectedStudent, setSelectedStudent] = useState(null);
+  const [question, setQuestion] = useState('');
+  const [answer, setAnswer] = useState('');
+
+  const handleFileUpload = (event) => {
+    const file = event.target.files[0];
+    const reader = new FileReader();
+
+    reader.onload = (e) => {
+      const text = e.target.result;
+      try {
+        const importedStudents = JSON.parse(text);
+        if (Array.isArray(importedStudents) && importedStudents.every(student => student.name)) {
+          const studentsWithPoints = importedStudents.map(student => ({ ...student, points: 0 }));
+          setStudents(studentsWithPoints);
+        } else {
+          alert("导入的文件格式不正确，请提供一个包含学生对象数组的 JSON 文件，每个对象应有 'name' 属性。");
+        }
+      } catch (error) {
+        alert("文件解析出错，请确保它是有效的 JSON 文件。");
+      }
+    };
+
+    reader.readAsText(file);
+  };
+
+  const handleStartCalling = () => {
+    setIsCalling(true);
+  };
+
+  const handleStudentSelect = (student) => {
+    setSelectedStudent(student);
+    const updatedStudents = students.map(s =>
+      s.name === student.name ? { ...s, points: s.points + 1 } : s
+    );
+    setStudents(updatedStudents);
+  };
+
+  const handleAnswerSubmission = () => {
+    if (!selectedStudent) return;
+
+    const correctRepeat = answer.trim() === question.trim();
+    let pointChange = 0;
+
+    if (correctRepeat) {
+      pointChange += 0.5; // 准确重复问题
+    } else {
+      pointChange -= 1; // 未准确重复问题
+    }
+
+    // 假设根据情况准确回答问题，加分 (这里可以扩展逻辑)
+    const correctAnswer = true; // 这里假设答案是正确的
+    if (correctAnswer) {
+      pointChange += 2; // 根据情况加分
+    }
+
+    const updatedStudents = students.map(s =>
+      s.name === selectedStudent.name ? { ...s, points: s.points + pointChange } : s
+    );
+
+    setStudents(updatedStudents);
+    setSelectedStudent(null);
+    setQuestion('');
+    setAnswer('');
+  };
+
+  return (
+    <div className="App">
+      <h1>课堂点名系统</h1>
+      <input type="file" accept=".json" onChange={handleFileUpload} />
+      <button onClick={handleStartCalling} disabled={students.length === 0 || isCalling}>
+        开始点名
+      </button>
+      <StudentList students={students} />
+      {isCalling && (
+        <RandomSelector students={students} onSelect={handleStudentSelect} />
+      )}
+      {selectedStudent && (
+        <div>
+          <h2>选中的学生：{selectedStudent.name}</h2>
+          <input
+            type="text"
+            placeholder="提问内容"
+            value={question}
+            onChange={(e) => setQuestion(e.target.value)}
+          />
+          <input
+            type="text"
+            placeholder="回答内容"
+            value={answer}
+            onChange={(e) => setAnswer(e.target.value)}
+          />
+          <button onClick={handleAnswerSubmission}>提交回答</button>
+        </div>
+      )}
+    </div>
+  );
+};
+
+export default App;