在nodejs

Question

我试图将一组全局变量和函数从一个Javascript文件导出到nodejs中的另一个Javascript文件。

从 的节点js.include.js

var GLOBAL_VARIABLE = 10;

exports.GLOBAL_VARIABLE = GLOBAL_VARIABLE;

module.exports = {

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

};

进入 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));

但变量;我得到以下输出：

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

为什么 GLOBAL_VARIABLE 导出？

Answer 1

解决此问题的两种方法：

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
};