js 实现简易点击切换显示或隐藏

<div id="header">
    <p>点击切换显示隐藏</p>
    <div class="close" onclick="closeTask()">关闭</div>
</div>
<div class="open" onclick="openTask()">打开</div>

* {
	margin:0;
	padding:0;
}
#header {
	width:100%;
	height:50px;
	background-color:cadetblue;
	text-align:center;
	color:white;
	position:relative;
	overflow:hidden;
	transition:all 0.5s;
}
#header>p {
	line-height:50px;
}
.close {
	position:absolute;
	right:5%;
	top:0;
	padding:10px;
	line-height:30px;
	cursor:pointer;
}
.open {
	position:absolute;
	right:5%;
	padding:10px;
	line-height:30px;
	background-color:cadetblue;
	cursor:pointer;
	transition:all 0.5s;
	color:white;
}

var oDiv = document.getElementById("header");
var oOpen = document.getElementsByClassName("open");
var oDivheight = oDiv.offsetHeight;
var oOpenheight = oOpen[0].offsetHeight;
oOpen[0].style.top = `-${oOpenheight}px`;

function closeTask() {
    oDiv.style.height = "0";
    oOpen[0].style.top = "0";
}

const openTask = () => {
    oDiv.style.height = `${oDivheight}px`;
    oOpen[0].style.top = `-${oOpenheight}px`;

}

本文地址：https://blog.csdn.net/qq_42363032/article/details/110225783