页面全部加载完毕和页面dom树加载完毕

dom树加载完毕

$(document).ready()

//原生写法document.ready = function (callback) {            ///兼容FF,Google            if (document.addEventListener) {                document.addEventListener(‘DOMContentLoaded‘, function () {                    document.removeEventListener(‘DOMContentLoaded‘, arguments.callee, false);                    callback();                }, false)            }             //兼容IE            else if (document.attachEvent) {                document.attachEvent(‘onreadytstatechange‘, function () {                      if (document.readyState == "complete") {                                document.detachEvent("onreadystatechange", arguments.callee);                                callback();                       }                })            }            else if (document.lastChild == document.body) {                callback();            }        }

页面全部（包括图片）加载完毕

$(window).load()

//原生window.onload=function(){}