函数间引用

同一个应用中的不同函数可以直接通过 require 相互引用。

例如，有一个名为 tools.js 的云函数，其代码如下：

// Remember to install axios before using
const axios = require('axios');

// Add a function to `module.exports`
// So it can be loaded in other Cloud Functions
module.exports.add = function(a, b) {
  return a + b;
}

// You can also export an async function
module.exports.getHumans = async function() {
  try {
    const result = await axios.get('https://www.google.com/humans.txt');
    return result.data;
  } catch (error) {
    return `Error: ${error.message}`;
  }
}

// Remember to install axios before using
const axios = require('axios');

// Add a function to `module.exports`
// So it can be loaded in other Cloud Functions
module.exports.add = function(a, b) {
  return a + b;
}

// You can also export an async function
module.exports.getHumans = async function() {
  try {
    const result = await axios.get('https://www.google.com/humans.txt');
    return result.data;
  } catch (error) {
    return `Error: ${error.message}`;
  }
}

在另一个名为 caller.js 的函数中，可以通过 require 引入并调用在 tool.js 中导出的函数：

// Load the functions using `require`
const { add, getHumans } = require('./tools');

module.exports = async function(params, context) {
  // Call the loaded functions
  const addResult = add(1, 2);
  // Remember to use `await` for async functions
  const humans = await getHumans();

  return {
    add: `1 + 2 = ${addResult}`,
    humans,
  };
}

// Load the functions using `require`
const { add, getHumans } = require('./tools');

module.exports = async function(params, context) {
  // Call the loaded functions
  const addResult = add(1, 2);
  // Remember to use `await` for async functions
  const humans = await getHumans();

  return {
    add: `1 + 2 = ${addResult}`,
    humans,
  };
}

选中 caller.js 并点击 Debug，可以看到 Response 区域返回如下结果：

json

{
  "add": "1 + 2 = 3",
  "humans": "Google is built by a large team of engineers, designers, researchers, robots, and others in many different sites across the globe. It is updated continuously, and built with more tools and technologies than we can shake a stick at. If you'd like to help us out, see careers.google.com.\n"
}

{
  "add": "1 + 2 = 3",
  "humans": "Google is built by a large team of engineers, designers, researchers, robots, and others in many different sites across the globe. It is updated continuously, and built with more tools and technologies than we can shake a stick at. If you'd like to help us out, see careers.google.com.\n"
}

注意，如果希望在线上成功调用，则所有被引用的函数都需要部署。在本例中，即需要同时部署 tools.js 和 caller.js 函数。

更多参考

通过 require 只能引用同一应用下的不同函数，若希望调用其他应用中的函数，可直接通过 HTTP 的形式访问，参考调用云函数
若想了解更多关于 Node.js 模块引用的细节，可参考 Node.js Modules 文档

函数间引用 ​

函数间引用