节点操作
var body = document.body;
var div = document.createElement('div');
body.appendChild(div);
var firstEle = body.children[0];
body.insertBefore(div, firstEle);
body.removeChild(firstEle);
var text = document.createElement('p');
body.replaceChild(text, div);
案例：
选择水果
节点属性
-
nodeType 节点的类型
-
1 元素节点
-
2 属性节点
-
3 文本节点
-
-
nodeName 节点的名称(标签名称)
-
nodeValue 节点值
-
元素节点的nodeValue始终是null
-
模拟文档树结构
function Node(option) {
this.id = option.id || '';
this.nodeName = option.nodeName || '';
this.nodeValue = option.nodeValue || '';
this.nodeType = 1;
this.children = option.children || [];
}var doc = new Node({
nodeName: 'html'
});
var head = new Node({
nodeName: 'head'
});
var body = new Node({
nodeName: 'body'
})
doc.children.push(head);
doc.children.push(body);var div = new Node({
nodeName: 'div',
nodeValue: 'haha',
});var p = new Node({
nodeName: 'p',
nodeValue: '段落'
})
body.children.push(div);
body.children.push(p);function getChildren(ele) {
for(var i = 0; i < ele.children.length; i++) {
var child = ele.children[i];
console.log(child.nodeName);
getChildren(child);
}
}
getChildren(doc);
节点层级
var box = document.getElementById('box');
console.log(box.parentNode);
console.log(box.childNodes);
console.log(box.children);
console.log(box.nextSibling);
console.log(box.previousSibling);
console.log(box.firstChild);
console.log(box.lastChild);
-
注意
childNodes和children的区别，childNodes获取的是子节点，children获取的是子元素
nextSibling和previousSibling获取的是节点，获取元素对应的属性是nextElementSibling和previousElementSibling获取的是元素
nextElementSibling和previousElementSibling有兼容性问题，IE9以后才支持
-
总结
节点操作，方法
appendChild()
insertBefore()
removeChild()
replaceChild()
节点层次，属性
parentNode
childNodes
children
nextSibling/previousSibling
firstChild/lastChild
