Fluent Interface in exports of Node.js

標題：Node.js的exports使用流暢介面寫法
Node.js (main.js)：

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var my = require('./count.js'); var foo = new my.foo(10, 2); foo.plus().say(); foo.times().say();

exports js (count.js)：

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var foo = function(m, n) { this.m = m; this.n = n; this.answer = 0; this.method = ""; }; foo.prototype.plus = function() { this.answer = this.m + this.n; this.method = "+"; return this; }; foo.prototype.times = function() { this.answer = this.m * this.n; this.method = "*"; return this; }; foo.prototype.say = function() { console.log("%d %s %d = %d", this.m, this.method, this.n, this.answer); return this; }; exports.foo = foo;

範例結果：
10 + 2 = 12 10 * 2 = 20

說明：
在Node.js中採用流暢介面寫法，並使用exports建立一個外部js，在主程式中require後使用。