1+ ( function ( deferred ) {
2+ if ( typeof module !== 'undefined' ) {
3+ var DeferredURLRequest = require ( './DeferredURLRequest' )
4+ for ( var k in DeferredURLRequest ) {
5+ DeferredAPI [ k ] = DeferredURLRequest [ k ]
6+ }
7+ module . exports = DeferredAPI
8+ }
9+ var global = function ( ) {
10+ return this || ( 1 , eval ) ( 'this' )
11+ } ( ) ;
12+ global [ 'Aaron' ] = deferred ;
13+ } ) ( new function ( ) {
14+ /**
15+ * 接口
16+ * @type {Object }
17+ */
18+ var API = {
19+ 'deferred' : deferred ,
20+ 'next' : Next ,
21+ 'wait' : Wait
22+ // all : all,
23+ // Deferred : Deferred,
24+ // DeferredList : DeferredList,
25+ // wrapResult : wrapResult,
26+ // wrapFailure : wrapFailure,
27+ // Failure : Failure
28+ }
29+
30+ function ok ( x ) {
31+ return x
32+ } ;
33+
34+ function ng ( x ) {
35+ throw x
36+ } ;
37+
38+ function deferred ( t ) {
39+ return new Deferred ( t )
40+ }
41+
42+ function Deferred ( ) {
43+ this . _next = null ;
44+ this . callback = {
45+ 'ok' : ok ,
46+ 'ng' : ng
47+ } ;
48+ return this ;
49+ }
50+
51+ Deferred . prototype . then = function ( fun ) {
52+ return this . _post ( "ok" , fun ) ;
53+ } ;
54+
55+ Deferred . prototype . error = function ( fun ) {
56+ return this . _post ( "ng" , fun ) ;
57+ } ;
58+
59+ Deferred . prototype . resolve = function ( val ) {
60+ return this . _fire ( "ok" , val ) ;
61+ } ;
62+
63+ Deferred . prototype . fail = function ( val ) {
64+ return this . _fire ( "ng" , err ) ;
65+ } ;
66+
67+ Deferred . prototype . cancel = function ( val ) {
68+ ( this . canceller || function ( ) {
69+ } ) . apply ( this ) ;
70+ return this . init ( ) ;
71+ } ;
72+
73+ Deferred . prototype . _post = function ( okng , fun ) {
74+ this . _next = new Deferred ( ) ;
75+ this . _next . callback [ okng ] = fun ;
76+ return this . _next ;
77+ } ;
78+
79+ Deferred . prototype . _fire = function ( okng , value ) {
80+ var next = "ok" ;
81+ try {
82+ //执行回调函数
83+ value = this . callback [ okng ] . call ( this , value ) ;
84+ } catch ( e ) {
85+ next = "ng" ;
86+ value = e ;
87+ if ( Deferred . onerror ) Deferred . onerror ( e ) ;
88+ }
89+ if ( isDeferred ( value ) ) { //如果返回值是deferred对象
90+ value . _next = this . _next ;
91+ } else {
92+ if ( this . _next ) this . _next . _fire ( next , value ) ;
93+ }
94+ return this ;
95+ } ;
96+
97+ function isDeferred ( obj ) {
98+ return ! ! ( obj && obj . _id === Deferred . prototype . _id ) ;
99+ } ;
100+
101+ function Next ( fun ) {
102+ var d = new Deferred ( ) ;
103+ var img = new Image ( ) ;
104+ var handler = function ( ) {
105+ d . canceller ( ) ;
106+ d . call ( ) ;
107+ } ;
108+ img . addEventListener ( "load" , handler , false ) ;
109+ img . addEventListener ( "error" , handler , false ) ;
110+ d . canceller = function ( ) {
111+ img . removeEventListener ( "load" , handler , false ) ;
112+ img . removeEventListener ( "error" , handler , false ) ;
113+ } ;
114+ img . src = "data:image/png," + Math . random ( ) ;
115+ if ( fun ) d . callback . ok = fun ;
116+ return d ;
117+ }
118+
119+ function Wait ( n ) {
120+ var d = new Deferred ( ) ,
121+ t = new Date ( ) ;
122+ var id = setTimeout ( function ( ) {
123+ d . call ( ( new Date ( ) ) . getTime ( ) - t . getTime ( ) ) ;
124+ } , n * 1000 ) ;
125+ d . canceller = function ( ) {
126+ clearTimeout ( id )
127+ } ;
128+ return d ;
129+ } ;
130+
131+ function register ( name , fun ) {
132+ Deferred . prototype [ name ] = function ( ) {
133+ var a = arguments ;
134+ return this . next ( function ( ) {
135+ return fun . apply ( this , a ) ;
136+ } ) ;
137+ } ;
138+ } ;
139+
140+ register ( "wait" , Wait ) ;
141+
142+ return API ;
143+ } ) ;
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