<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<!--
1.整个文档是一个文档节点
2.每个 HTML 元素是元素节点
3.HTML 元素内的文本是文本节点
4.每个 HTML 属性是属性节点
5.注释是注释节点
-->
<div class="wrap">
<input type="checkbox">
<input type="checkbox">
<input type="text">
</div>
<script>
const log = console.log.bind(console)
const findElement = (sel) => {
const ele = document.querySelector(sel)
return ele
}
const findElements = (sel) => {
const ele = document.querySelectorAll(sel)
return ele
}
const findElementByAttr = (sel, attr, val) => {
const es = findElements(sel)
const result = []
// NodeList 并不是 Array
es.forEach(e => {
if (e.getAttribute(attr) === val) {
result.push(e)
}
})
return result
}
const createElement = (tag) => {
const ele = document.createElement(tag)
return ele
}
const createTextNode = (str) => {
const node = document.createTextNode(str)
return node
}
const main = () => {
let parent = findElement('.wrap')
let child = createElement('p')
let text = createTextNode('haha')
let text1 = createTextNode('heihei')
child.appendChild(text)
parent.appendChild(child)
child.replaceChild(text1, text)
parent.removeChild(child)
let textInput = findElementByAttr('input', 'type', 'text')
parent.insertBefore(child, textInput[0])
let checkbox = findElementByAttr('input', 'type', 'checkbox')
log('checkbox', checkbox)
}
main()
</script>
</body>
</html>
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