lazyman

use a array to simulate stacks

simple method / ********************************* / var tasks = []; function next() { console.log(tasks); var fn = tasks.shift(); fn && fn(); } function init() { var fn = (function () { return function () { setTimeout(function () { next(); }, 0) } })(); tasks.push(fn); next(); return this; } function first() { var fn = (function () { return function () { setTimeout(function () { console.log(1); next(); }, 1000); } })(); tasks.push(fn); return this; } function two() { var fn = (function () { return function () { setTimeout(function () { console.log(2); next(); }, 1000); } })(); tasks.push(fn); return this; }

init();
two();
first();

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