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html-range-api.html
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html-range-api.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<div id="a">
<span>1</span>
<p>2</p>
<a>3</a>
<div>4</div>
</div>
</body>
<script>
let element = document.getElementById('a')
// function reverseChildren(element) {
// let children = Array.prototype.slice.call(element.childNodes) // 改变 living collection
// for (let child of children) {
// element.removeChild(child)
// }
// children.reverse()
// for (let child of children) {
// element.appendChild(child)
// }
// }
// function reverseChildren(element) {
// let len = element.childNodes.length
// while(len -- > 0) {
// element.appendChild(element.childNodes[len])
// }
// }
// function reverseChildren(element) {
// let len = element.childNodes.length
// let tempFragment = document.createDocumentFragment()
// while(len -- > 0) {
// tempFragment.appendChild(element.childNodes[len])
// }
// element.appendChild(tempFragment)
// }
function reverseChildren(element) {
let range = new Range()
range.selectNodeContents(element) // 选中
let fragment = range.extractContents() // 切除 少 createDocumentFragment
let len = fragment.childNodes.length
while(len -- > 0) {
fragment.appendChild(fragment.childNodes[len])
}
element.appendChild(fragment)
}
reverseChildren(element)
</script>
</html>