phodal/lettuce

/*
 *  Copyright 2012-2013 (c) Pierre Duquesne <stackp@online.fr>
 *  Licensed under the New BSD License.
 *  https://github.com/stackp/promisejs
 */

function Promise() {
    this._callbacks = [];
}

Promise.prototype.then = function(func, context) {
    var p;
    if (this._isdone) {
        p = func.apply(context, this.result);
    } else {
        /*p = new Promise();
        this._callbacks.push(function () {
            var res = func.apply(context, arguments);
            if (res && typeof res.then === 'function') {
                res.then(p.done, p);
            }
        });*/    // 这块执行时出问题
        this._callbacks.push(func.bind(this,arguments))
    }
    return this;
};

Promise.prototype.done = function() {
    this.result = arguments;
    this._isdone = true;
    for (var i = 0; i < this._callbacks.length; i++) {
        this._callbacks[i].apply(null, arguments);
    }
    this._callbacks = [];
};

var promise = {
    Promise: Promise
};

Lettuce.prototype = Lettuce.extend(Lettuce.prototype, promise);