JavaScript框架设计-异步处理

setTimeout和setInterval

Mochikit Deferred

JSDeferred

jQuery Deferred

Promise/A 与 mmDeferred

javascript 异步处理的前景

function ExecuteQueue(){
this.queue = [];
this.executing = false;
}

ExecuteQueue.prototype = {
then:function(foo){
if(this.executing){
this.queue.push(foo);
}
else{
var that = this;
foo(function(){
that.executing = false;
that.next();
})
}
},

next:function(){
if(this.queue.length > 0){
var foo = this.queue.shift();
var that = this;

foo(function(){
that.executing = false;
that.next();
})
}
}
}

function a(success,failure){
console.log('a');
success();
}

function b(success,failure){
console.log('b');
success();
}

function c(success,failure){
console.log('c');
success();
}

// 使用

var queue = new ExecuteQueue();

queue.then(a).then(b).then(c);

//a
//b
//c