javascript 的document.ready

Posted 2021-05-03

(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);
   };
})();

document.ready(function(){
   alert('Document is ready!');
});