document ready javacsript

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

1document.addEventListener("DOMContentLoaded", function(event) { 
2  //we ready baby
3});

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