node.js怎么引用外部js

require('js文件路径');

var fun1 = require('./fun1');

var fun2 = require('./fun2');

function test(){

     console.log("调用了fun的test方法");

     fun1.add(1,2);

     fun2();

}

     test();

function reduce(a,b){

    console.log("调用了fun1的reduce方法");

    console.log(a-b);

}

function add(a,b){

    console.log("调用了fun1的add方法");

    console.log(a+b);

}

module.exports = {

 reduce,

 add

}