document jquery

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

1$(document).ready(function () {
2  // Function code here.
3});

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

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

1$(function(){
2  // equal to $( document ).ready(function() {
3});
4  

1jQuery offers several ways to attach a function that will run when the DOM is ready. All of the following syntaxes are equivalent:
2
3$( handler )
4$( document ).ready( handler )
5$( "document" ).ready( handler )
6$( "img" ).ready( handler )
7$().ready( handler )