node.js学习日记（二）node.js的作用域

1 //paackage1.js
2 var a1 = 1;
3 
4 require("./package2");
5 
6 /*即使require了package2，也无法调用函数double_a*/
7 a1 = double_a(a1);//double_a is not defined
8 
9 console.log("package1：" + a1);

1 //paackage2.js
2 function double_a(a) {
3     return a * 2;
4 }
5 
6 exports.double_a = double_a;

1 //package1
2 var a1 = 1;
3 
4 /*todo:获取了package2的exports对象*/
5 var package2 = require("./package2");
6 
7 a1 = package2.double_a(a1);
8 console.log("package2：" + a1);

1 //package2
2 function double_a(a) {
3     return a * 2;
4 }
5 
6 /*todo:把double_a挂载到exports对象*/
7 exports.double_a = double_a;

1 //package1
2 var package2 = require("./package2");
3 console.log("name：" + package2.getName());

1 //package2
2 var name = "lyjn";
3 
4 /*todo:exports设置一个getName的方法获取name*/
5 exports.getName = function() {
6     return name;
7 };