最近研究es6的promise觉得非常好用，还有jquery的 $.Deferred()、node里面的Q模块，都研究了一遍，于是自己用es5写了一个类似的promise功能
1 var Q = {};
2 Q.deffer = function() {
3 var fn = {};
4 var resolve = null;
5 var reject = null;
6 var dOne= null;
7 var promis = {
8 then: function(resolved, rejected) {
9 resolve = resolved || function() {};
10 reject = rejected || function() {};
11 return promis;
12 },
13 done: function(doned) {
14 dOne= doned || function() {};
15 return promis;
16 }
17 };
18
19 fn.promise = function() {
20 return promis;
21 };
22
23 fn.resolve = function(data) {
24 setTimeout(function() {
25 if(resolve) {
26 resolve(data);
27 }
28 if(done) {
29 done();
30 }
31 }, 0)
32
33 };
34
35 fn.reject = function(data) {
36 setTimeout(function() {
37 if(reject) {
38 reject(data);
39 }
40 if(done) {
41 done();
42 }
43 }, 0)
44
45 };
46
47 return fn;
48 }
49
50 Q.all = function(list) {
51 var fn = {};
52 var resolve = null;
53 var reject = null;
54 var dOne= null;
55 var resolveList = [];
56 var rejectList = [];
57 var promis = {
58 then: function(resolved, rejected) {
59 resolve = resolved || function() {};
60 reject = rejected || function() {};
61 return promis;
62 },
63 done: function(doned) {
64 dOne= doned || function() {};
65 return promis;
66 }
67 };
68
69 var count = 0;
70
71 for(var i = 0; i ) {
72 try {
73 list[i].then(function(data) {
74 resolveList.push(data);
75 if(resolveList.length == list.length) {
76 if(resolve) {
77 resolve(resolveList);
78 }
79 }
80 }, function(data) {
81 rejectList.push(data);
82 if(reject) {
83 reject(data);
84 }
85 }).done(function() {
86 count++;
87 if(count >= list.length) {
88 if(done) {
89 done(resolveList,rejectList);
90 }
91 }
92 });
93 } catch(e) {
94 if(done) {
95 done(resolveList,rejectList,e);
96 }
97 }
98
99 }
100
101
102
103 return promis;
104 };
function _delay(time) {
var def = Q.deffer();
if(time == 1) {
def.resolve({
"正确": "success"
});
} else {
def.reject({
"错误": "error"
});
}
return def.promise();
}
_delay(0).then(function(data) {
console.log("then");
console.log(data);
}, function(err) {
console.log(err);
}).done();
function request(){
var deferred = Q.deffer();
$.ajax({
type:"get",
url:"xxxxxxxxxxx",
success:function(data){
deferred.resolve(data);
},
error:function(error){
deferred.resolve(error);
}
});
return deferred.promise();
}
request().then(function(data){
console.log(data);
},function(err){
console.log(err);
}).done();
function request(){
var deferred = Q.deffer();
$.ajax({
type:"get",
url:"xxxxx",
success:function(data){
deferred.resolve(data);
},
error:function(error){
deferred.resolve(error);
}
});
return deferred.promise();
}
var promiseArr = [];
promiseArr.push(request());
promiseArr.push(request());
Q.all(promiseArr).then(function(data){
console.log(data);
},function(er){
console.log(er);
}).done(function(resolve,reject,e){
console.log(‘done‘);
});
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