javascript - How to know if document has loaded -

i have piece of js code needs determine if dom has loaded. know there several ways of executing js code when dom has loaded like:

$(document).ready(function() { ... }); // jquery version  document.body.onload = function() { ... } // vanila js way 

i looking method looks like

function isdomloaded() {     // check if dom loaded or not     // return true/false depending upon logic } 

ps: update (post answer accept) happen see jquery use same approach check if dom has loaded. take @ implementation of jquery.ready() here

bindready: function() {     if ( readybound ) {         return;     }      readybound = true;      // catch cases $(document).ready() called after     // browser event has occurred.     if ( document.readystate === "complete" ) {         return jquery.ready();     }      ... 

function isdomloaded(){  return document.readystate == 'complete'; }