then:?function(?/*?fnDone,?fnFail,?fnProgress?*/?)?{
????????????????????var?fns?=?arguments;
????????????????????return?jQuery.Deferred(function(?newDefer?)?{????
//--------------?newDefer?也為什么直接就有了resolve，done方法呢？??????????????
????????????????????
????????????????????????jQuery.each(?tuples,?function(?i,?tuple?)?{
????????????????????????????var?action?=?tuple[?0?],
????????????????????????????????fn?=?jQuery.isFunction(?fns[?i?]?)?&&?fns[?i?];
????????????????????????????//?deferred[?done?|?fail?|?progress?]?for?forwarding?actions?to?newDefer
????????????????????????????deferred[?tuple[1]?](function()?{
????????????????????????????????var?returned?=?fn?&&?fn.apply(?this,?arguments?);
????????????????????????????????if?(?returned?&&?jQuery.isFunction(?returned.promise?)?)?{
????????????????????????????????????returned.promise()
????????????????????????????????????????.done(?newDefer.resolve?)
????????????????????????????????????????.fail(?newDefer.reject?)
????????????????????????????????????????.progress(?newDefer.notify?);
????????????????????????????????}?else?{
????????????????????????????????????newDefer[?action?+?"With"?](?this?===?promise???newDefer.promise()?:?this,?fn???[?returned?]?:?arguments?);
????????????????????????????????}
????????????????????????????});
????????????????????????});
????????????????????????fns?=?null;
????????????????????}).promise();
????????????????}
2016-10-12
懂了，汗，自己突然就想通了，原因在于這行代碼：
if?(?func?)?{ ????????????func.call(?deferred,?deferred?); ????????}call里面第二個(gè)deferred對(duì)象作為參數(shù)穿進(jìn)去了，正好對(duì)應(yīng)
?return?jQuery.Deferred(function(?newDefer?)?{這個(gè)newDefer， 這樣就對(duì)啦，哈哈