1、元素获取
/*******************原生js**************************/
var ele = document.getElementById('idName');
var eleArr = document.getElementsByClassName('className');
var eleArr = document.getElementsByTagName('div');
var ele = document.querySelector('#idName');//('.className')//('tagName'); //取第一个满足条件的元素
var eleArr = document.querySelectorAll('.className');//('tagName');
/*******************jQuery**************************/
var ele = $('#idName');
var ele = $('.className:eq(0)'); //取第一个元素
var eleArr = $('tagName');/*******************原生js**************
