Created
April 17, 2014 14:25
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Параллельное и последовательное выполнения асинхронного кода
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function initA(cb) { | |
setTimeout(function() { | |
var a = 1; | |
cb(a); | |
}, Math.random() * 3000); | |
} | |
function initB(cb) { | |
setTimeout(function() { | |
var b = 2; | |
cb(b); | |
}, Math.random() * 3000); | |
} | |
function initC(cb) { | |
setTimeout(function() { | |
var c = 3; | |
cb(c); | |
}, Math.random() * 3000); | |
} | |
function paralell(arr, cb) { | |
var length = arr.length; | |
var count = 0; | |
var results = []; | |
arr.forEach(function(fn, i) { | |
fn(function(x) { | |
results[i] = x; | |
count++; | |
if (count == length) { | |
cb(results) | |
} | |
}); | |
}); | |
} | |
function linear(arr, cb) { | |
var results = []; | |
function foo(arr, index) { | |
arr[index](function(x) { | |
results[index] = x; | |
index++; | |
if (index < arr.length) { | |
foo(arr, index); | |
} else { | |
console.log(results) | |
cb(results); | |
} | |
}); | |
} | |
foo(arr, 0); | |
} | |
linear([ | |
function(cb) { | |
initA(cb); | |
}, | |
function(cb) { | |
initB(cb); | |
}, | |
function(cb) { | |
initC(cb); | |
} | |
], function(args) { | |
var a = args[0]; | |
var b = args[1]; | |
var c = args[2]; | |
foo(a,b,c); | |
}); | |
function foo(a, b, c) { console.log(a + b + c); } | |
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