原生js实现document.ready效果

直接上代码：

(function () { var ie = !!(window.attachEvent && !window.opera);var wk = /webkit//(/d+)/i.test(navigator.userAgent) && (RegExp.$1 < 525);var fn = []; var run = function (){ for (var i = 0; i < fn.length; i++) fn[i](); }; var d = document; d.ready = function (f) { if (!ie && !wk && d.addEventListener) return d.addEventListener('DOMContentLoaded', f, false); if (fn.push(f) > 1) return; if (ie) (function () { try { d.documentElement.doScroll('left'); run(); } catch (err) { setTimeout(arguments.callee, 0); } })(); else if (wk) var t = setInterval(function () { if (/^(loaded|complete)$/.test(d.readyState)) clearInterval(t), run(); }, 0); }; })(); //usagedocument.ready(function(){check_radio();});