1$( document ).ready(function() {
2    console.log( "ready!" );
3});
4

1document.addEventListener("DOMContentLoaded", function() {
2  // code
3});

1// A $( document ).ready() block.
2$( document ).ready(function() {
3    console.log( "ready!" );
4});
5

1// without jQuery (doesn't work in older IEs)
2document.addEventListener('DOMContentLoaded', function(){ 
3    // your code goes here
4}, false);
5

1window.onload = function() {
2
3};

1$(document).ready(function(){
2  $("button").click(function(){
3    $("p").slideToggle();
4  });
5});