通过交互式动手教程学习代码节点（JavaScript）基础知识

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              "type": "array",
              "value": "=[{\"firstName\":\"Alice\",\"lastName\":\"Smith\",\"birthDate\":\"1990-05-15\"},{\"firstName\":\"Bob\",\"lastName\":\"Jones\",\"birthDate\":\"1985-11-22\"},{\"firstName\":\"Charlie\",\"lastName\":\"Brown\",\"birthDate\":\"2001-02-10\"}, {\"firstName\":\"Alex\",\"lastName\":\"Garcia\",\"birthDate\":\"1995-07-30\"}]"
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      "typeVersion": 3.4
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    {
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      "name": "2. 拆分用户数据",
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        "fieldToSplitOut": "users"
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    {
      "id": "39ab2c6f-11ce-4e1e-a6c7-327d758f6d0c",
      "name": "3. 处理每个用户",
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      "parameters": {
        "mode": "runOnceForEachItem",
        "jsCode": "// This code runs for EACH user individually.\n\n// 1. Get the data for the current item\nconst user = $input.item.json;\n\n// 2. Perform operations\nconst fullName = `${user.firstName} ${user.lastName}`;\n\nconst birthDate = new Date(user.birthDate);\nconst ageDiffMs = Date.now() - birthDate.getTime();\nconst ageDate = new Date(ageDiffMs);\nconst age = Math.abs(ageDate.getUTCFullYear() - 1970);\n\nconsole.log(`Processing user: ${fullName}, Age: ${age}`);\n\n// 3. Return the new data, keeping the original fields\nreturn {\n  ...user, // This keeps the original data (firstName, lastName, etc.)\n  fullName: fullName,\n  age: age\n};"
      },
      "typeVersion": 2
    },
    {
      "id": "9f4aa08e-f15f-4215-843c-87997e6d6cff",
      "name": "5. 计算平均年龄",
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      "position": [
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      "parameters": {
        "jsCode": "// This code runs only ONCE for ALL users.\n\n// 1. Get all items from the previous node\nconst allUsers = $items();\n\n// 2. Perform an aggregation\nconst totalAge = allUsers.reduce((sum, item) => {\n  return sum + item.json.age;\n}, 0);\n\nconst userCount = allUsers.length;\nconst averageAge = totalAge / userCount;\n\nconsole.log(`Calculated average age for ${userCount} users.`);\n\n// 3. Return a single new item with the result\nreturn [\n  {\n    json: {\n      totalUsers: userCount,\n      averageAge: parseFloat(averageAge.toFixed(2)) // Format to 2 decimal places\n    }\n  }\n];"
      },
      "typeVersion": 2
    },
    {
      "id": "2e7f0710-0b4a-450e-8e87-591c5324f5c7",
      "name": "4. 获取外部数据（高级）",
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      "position": [
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      ],
      "parameters": {
        "mode": "runOnceForEachItem",
        "jsCode": "// ADVANCED: This code calls an external API for each user.\n\n// 1. Get the data for the current item\nconst user = $input.item.json;\n\n// 2. Use a helper function to make an HTTP request\n// We'll use a free API to guess the gender based on the first name.\nconst url = `https://api.genderize.io?name=${user.firstName}`;\n\nconsole.log(`Fetching external data for ${user.firstName} from ${url}`)\n\n// this.helpers.httpRequest is a powerful built-in function.\n// We use 'await' because it's an asynchronous operation.\nconst response = await this.helpers.httpRequest({ url: url, json: true });\n\n// 3. Return the original data merged with the new API data\nreturn {\n  ...user, // Keep all existing data (fullName, age, etc.)\n  gender: response.gender,\n  genderProbability: response.probability\n};"
      },
      "typeVersion": 2
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    {
      "id": "809e91c4-02b6-4d12-b8f0-e9cd96d92c24",
      "name": "便签",
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      "position": [
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      "parameters": {
        "color": 5,
        "width": 440,
        "height": 420,
        "content": "#### ▶️ 起点：示例数据"
      },
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    {
      "id": "bc8ec047-8595-4a07-8422-09779f8490c0",
      "name": "便签1",
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      "position": [
        900,
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      ],
      "parameters": {
        "color": 7,
        "width": 380,
        "height": 580,
        "content": "#### ⚙️ 第一课：处理每个项目"
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    {
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      "position": [
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      "parameters": {
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        "content": "#### 🚀 高级第二课：使用辅助函数"
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      "position": [
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      "parameters": {
        "color": 7,
        "width": 380,
        "height": 580,
        "content": "#### ⚙️ 第三课：一次性处理所有项目"
      },
      "typeVersion": 1
    },
    {
      "id": "5c84ce9f-32d0-4222-9b1a-3887677bdabe",
      "name": "6. 创建二进制文件（专家级）",
      "type": "n8n-nodes-base.code",
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        "jsCode": "// LESSON 4 (EXPERT): Creating a binary file.\n\n// This node runs only ONCE for ALL items.\n\n// 1. Get all items from the previous node\nconst allUsers = $(\"4. Fetch External Data (Advanced)\").all();\n\n// 2. Create a CSV string from the data\nlet csvContent = \"FullName,Age,GenderGuess,ProcessedBy\\n\"; // CSV Header\n\nfor (const item of allUsers) {\n  const user = item.json;\n  const row = `\"${user.fullName}\",${user.age},${user.gender},n8n`;\n  csvContent += row + \"\\n\";\n}\n\n// 3. Use a helper to create a binary file from the string\nconst binaryData = await this.helpers.prepareBinaryData(Buffer.from(csvContent), 'user_report.csv');\n\n// 4. Return a new item containing the binary data\nreturn [\n  {\n    json: {\n      reportGenerated: new Date().toISOString(),\n      userCount: allUsers.length\n    },\n    binary: {\n      'report': binaryData\n    }\n  }\n];"
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      "position": [
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      "parameters": {
        "color": 3,
        "width": 380,
        "height": 580,
        "content": "#### 📄 专家第四课：创建文件"
      },
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            "node": "4. Fetch External Data (Advanced)",
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