js中DOM元素的操作方法

var node1 = document.createElement('p');
var node2 = document.createTextNode('Hello World');

var ele1 = document.querySelector('{.className/#id/tagName}');
var eleList = document.querySelectorAll('.className,#id,p');

var ele2 = document.getElementById('{id}')
var ele3 = document.getElementByClassName('{className}');
var ele4 = document.getElementByTagName('{tagName}');

var parent = ele.parentElement; //父元素
parent = ele.parentNode; //只读父元素
var children = ele.children;
var firstChild = ele.firstElementChild;
firstChild = ele.firstChild;
var lastChild = ele.lastElementChild;
lastChild = ele.lastChild;
var nextSibling = ele.nextSibling;
var prevSiblint = ele.previousSibling;

var attrs = ele.attributes; //获取所有属性 key-value
var classes = ele.getAttribute('class'); //获取单一属性值
ele.setAttribute('class','className'); //设置属性

ele.hasAttribute('attrName'); //判断属性是否存在
ele.removeAttribute('attrName'); //移除属性
ele.hasAttributes(); //是否有属性设置

ele.appendChild('elc');
ele.removeChild('elc');

ele.replaceChild('elc1','elc2'); 
ele.insertBefore('elc','refElc'); //插入到子节点refElc节点之前
ele.cloneNode(true); //该参数表示被复制的节点是否包括所有属性和子节点