How to operate DOM elements in js

DOM node (node) generally corresponds to a label, a text version or an HTML attribute. DOM nodes have a nodeType attribute used to represent the enumeration type of the current element, {1:Element,2:Attribute,3:Text}. This article mainly shares with you the operation methods of DOM elements in js. I hope it can help you.

1. Create DOM node

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

2. Selector

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}');

3. Parent-child sibling node

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;

4. Attribute

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

5. DOM modification

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

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