chainer

sample.js

function toChain(target) {
    var queue = [];
    var lastReturn;
    Object.keys(target).forEach(function (prop) {
        var original;
        if (typeof target[prop] === 'function') {
            original = target[prop];
            target[prop] = function () {
                var args = arguments;
                queue.push(function () {
                    original.apply(target, args);
                });
                return target;
            }
        }
    });
    return function () {
        queue.forEach(function (fn) {
            lastReturn = fn();
        });
        return lastReturn;
    };
}

var obj = {
    test: '',
    fun1: function (test) {
        this.test += test;
    },
    fun2: function (test2) {
        this.test += test2;
    },
    getTest: function () {
        return this.test;
    },
    log: function (str) {
        console.log('======================log======================');
        console.log(str);
    },
    fun3: function (test3) {
        this.test += test3;
    }
};
var run = toChain(obj);

obj
    .fun1('test1')
    .fun2('test2')
    .log('my log')
    .fun3('fun3')
    .getTest();

console.log(run());