$.when({aa:1}, {aa:2}).done(function(a,b){
console.log(a.aa)
console.log(b.aa)
});
直接输出1,2。如果是传入两个函数，也是返回两个函数。因此对于普通的数据类型，前面的when有多少个参数，后面的done, fail方法的回调就有多少个参数。
function fn(){
return 4;
}
function log(s){
window.console && console.log(s)
}
$.when( { num:1 }, 2, ‘3’, fn() ).done(function(o1, o2, o3, o4){
log(o1.num);
log(o2);
log(o3);
log(o4);
});
如果我们想得到各个异步的结果，我们需要用resolve, resolveWith, reject, rejectWith进行传递它们。
var log = function(msg){
window.console && console.log(msg)
}
function asyncThing1(){
var dfd = $.Deferred();
setTimeout(function(){
log(‘asyncThing1 seems to be done…’);
dfd.resolve(‘1111’);
},1000);
return dfd.promise();
}
function asyncThing2(){
var dfd = $.Deferred();
setTimeout(function(){
log(‘asyncThing2 seems to be done…’);
dfd.resolve(‘222’);
},1500);
return dfd.promise();
}
function asyncThing3(){
var dfd = $.Deferred();
setTimeout(function(){
log(‘asyncThing3 seems to be done…’);
dfd.resolve(‘333’);
},2000);
return dfd.promise();
}
/* do it */
$.when( asyncThing1(), asyncThing2(), asyncThing3() ).done(function(res1, res2, res3){
log(‘all done!’);
log(res1 + ‘, ‘ + res2 + ‘, ‘ + res3);
})
异步列队一开始没什么人用（现在也没有什么人用，概念太抽象了，方法名起得太烂了），于是它只能在内部自产自销。首先被染指的是queue。queue模块是1.4为吸引社区的delay插件，特地从data模块中分化的产物，而data则是从event模块化分出来的。jQuery新模块的诞生总是因为用户对已有API的局限制不满而致。最早的queue模块的源码：
jQuery.extend({
queue: function( elem, type, data ) {
if ( !elem ) {
return;
}
type = (type || “fx”) + “queue”;
var q = jQuery.data( elem, type );
// Speed up dequeue by getting out quickly if this is just a lookup
if ( !data ) {
return q || [];
}
if ( !q || jQuery.isArray(data) ) {
q = jQuery.data( elem, type, jQuery.makeArray(data) );
} else {
q.push( data );
}
return q;
},
dequeue: function( elem, type ) {
type = type || “fx”;
var queue = jQuery.queue( elem, type ), fn = queue.shift();
// If the fx queue is dequeued, always remove the progress sentinel
if ( fn === “inprogress” ) {
fn = queue.shift();
}
if ( fn ) {
// Add a progress sentinel to prevent the fx queue from being
// automatically dequeued
if ( type === “fx” ) {
