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有没有清除.thenJavaScript Promise实例的方法？

我在QUnit上编写了一个JavaScript测试框架.框架通过在a中运行每个框架来同步运行测试Promise.(抱歉这个代码块的长度.我尽可能地评论它,所以感觉不那么乏味.)

/* Promise extension -- used for easily making an async step with a
       timeout without the Promise knowing anything about the function 
       it's waiting on */
$$.extend(Promise, {
    asyncTimeout: function (timeToLive, errorMessage) {
        var error = new Error(errorMessage || "Operation timed out.");
        var res, // resolve()
            rej, // reject()
            t,   // timeout instance
            rst, // reset timeout function
            p,   // the promise instance
            at;  // the returned asyncTimeout instance

        function …