lovecoding
/
W0407


			
				
					
						
						
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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="box">
        <div id="first">
            <span>我是第一个span</span>
        </div>
        <ul>
            <li>你好1</li>
            <li>你好2</li>
            <li>你好3</li>
            <li>你好4</li>
        </ul>
        <div class="hi">哈哈</div>
    </div>
    <script>
        var box = document.getElementById("box");
        var first = document.querySelector("#first");
        var span = document.querySelector("span");
        var list = document.querySelectorAll("ul li");
        var hi = document.getElementsByClassName("hi");
        var uls = document.querySelector("ul");
        console.log(box,first,span,list,hi);
        console.log([1,2,3,4,5])
        console.log("box",box)
        console.log(box.childNodes[1].innerText);
        // 创建节点
        var a = document.createElement("h1");
        a.innerText = '五一';
        console.log(a,'a');
        // 添加节点
        box.appendChild(a);
        var b = document.createElement("li");
        b.innerText = '五四';
        uls.appendChild(b);
        // [1,2,3]
        var c = document.createElement("h2");
        c.innerText = '端午';
        // 插入节点
        box.insertBefore(c,uls);
        // 删除节点
        box.removeChild(a);
        var d = document.createElement("h3");
        d.innerText = '国庆节';
        // 替换节点
        box.replaceChild(d,c);
        console.log(box.childNodes)
        console.log(box.firstChild)
        console.log(box.lastChild)
        console.log(uls.childNodes[2].previousSibling)
        console.log(uls.childNodes[1].nextSibling)
        console.log(uls.childNodes)
        console.log(uls.childNodes[2].previousElementSibling)
        console.log(uls.childNodes[2].nextElementSibling)
        console.log(box.lastElementChild)
        console.log(box.firstElementChild)
    </script>
</body>
</html>