在nodejs中導出變量和函數

Question

我正在嘗試將一組全局變量和函數從一個Javascript文件導出到nodejs中的另一個。

來自node-js.include.js

var GLOBAL_VARIABLE = 10;

exports.GLOBAL_VARIABLE = GLOBAL_VARIABLE;

module.exports = {

    add: function(a, b) {
        return a + b;
    }

};

進入test-node-js-include.js ：

var includes = require('./node-js-include');

process.stdout.write("We have imported a global variable with value " + includes.GLOBAL_VARIABLE);

process.stdout.write("\n and added a constant value to it " + includes.add(includes.GLOBAL_VARIABLE, 10));

但變量; 我得到以下輸出：

We have imported a global variable with value undefined
 and added a constant value to it NaN

為什么不出口GLOBAL_VARIABLE ？

Answer 1

2種解決方法：

module.exports.GLOBAL_VARIABLE = GLOBAL_VARIABLE;

module.exports.add: function(a, b) {
    return a + b;
};

---

module.exports.GLOBAL_VARIABLE = GLOBAL_VARIABLE;

module.exports = { 
    add: function(a, b) {
        return a + b;
    }, 
    GLOBAL_VARIABLE: GLOBAL_VARIABLE
};