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day1020-dom-intro.html
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<!DOCTYPE html>
<html lang="zh-cn">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>DOM 入门</title>
<style>
p {
padding-left: 40px;
}
.hidden {
display: none;
}
</style>
</head>
<body>
<h1>h1</h1>
<ul class="klass">
<li>a</li>
<li>b</li>
<li>c</li>
</ul>
<p>
p
<span>p-span</span>
pp
<span class="hidden">pp-span</span>
ppp
<span>ppp-span</span>
</p>
<script>
var oUl = document.querySelector("ul");
console.log(oUl.innerHTML, oUl.innerText);
console.log(oUl.children);
console.log(oUl.childNodes);
console.log(oUl.firstChild);
console.log(oUl.firstElementChild);
console.log(oUl.lastChild);
console.log(oUl.lastElementChild);
var oP = document.querySelector("p");
var aSpan = oP.querySelectorAll("span");
console.log(aSpan[0].parentElement);
console.log(aSpan[0].parentNode);
console.log(aSpan[1].nextElementSibling);
console.log(aSpan[1].nextSibling);
console.log(aSpan[2].previousElementSibling);
console.log(aSpan[2].previousSibling);
console.log("innerHTML", oP.innerHTML);
console.log("innerText", oP.innerText);
console.log("textContent", oP.textContent);
oP.append(oP.lastElementChild.cloneNode(true), oP.lastElementChild.cloneNode(true), oP.lastElementChild.cloneNode(true));
oP.style.display = "flex";
oP.style.gap = "3em";
oP.replaceChild(aSpan[1], aSpan[0]);
var inserted = document.createElement("span");
inserted.textContent = "inserted";
// #text does not have insertAdjacentElement
// aSpan[1].nextSibling.insertAdjacentElement("afterend", inserted);
document.querySelector("span:nth-of-type(2)").insertAdjacentElement("beforebegin", inserted);
</script>
</body>
</html>