CSS样式
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
html,
body {
width: 100%;
height: 100%;
}
.container {
width: 100%;
height: 100%;
background-color: #f2f1f2;
}
header {
width: 1200px;
height: 50px;
background-color: #fff;
margin: 0 auto;
display: flex;
justify-content: space-between;
align-items: center;
}
header div:nth-of-type(2) {
display: flex;
gap: 20px;
cursor: pointer;
}
header div:nth-of-type(2) span:hover {
font-weight: bolder;
color: red;
}
.login-box {
display: none;
overflow: hidden;
width: 500px;
height: 300px;
background-color: #1fdec1;
border: solid 1px orangered;
border-radius: 8px;
box-shadow: rgba(255, 0, 0, 0.5) 5px 5px 5px;
position: absolute;
left: 1150px;
top: 50px;
}
.login-box .header {
height: 40px;
background-color: orangered;
display: flex;
justify-content: space-between;
align-items: center;
color: white;
cursor: pointer;
padding: 0 10px;
}
HTML
<!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 class="container">
<header>
<div>
<span>登录后享受更多内容</span>
</div>
<div>
<span id="login">登录</span>
<span id="register">注册</span>
</div>
<div class="login-box" id="login-box">
<div class="header" id="header">
<span>登录</span>
<span id="close">X</span>
</div>
</div>
</header>
</div>
</body>
</html>
JS代码
<script>
let _login = document.getElementById("login");
let _login_box = document.getElementById("login-box");
_login.onclick = function () {
_login_box.style.display = "block";
}
let _close = document.getElementById("close");
_close.onclick = function () {
_login_box.style.display = "none";
}
let _header = document.getElementById("header");
document.onmousedown = function (event) {
let offsetX = event.offsetX;
let offsetY = event.offsetY;
_header.onmousemove = function (event2) {
let mouseX = event2.clientX;
let mouseY = event2.clientY;
let loginX = mouseX - offsetX + "px";
let loginY = mouseY - offsetY + "px";
if (loginX <= 0) {
loginX = 0;
}
if (loginY <= 0) {
loginY = 0;
}
let iw = window.innerWidth;
let lw = getComputedStyle(_login_box).width;
lw = parseInt(lw);
if (loginX >= (iw - lw)) {
loginX = iw - lw;
}
let ih = window.innerHeight;
let lh = getComputedStyle(_login_box).height;
lh = parseInt(lh);
if (loginY >= (ih - lh)) {
loginY = ih - lh;
}
_login_box.style.left = loginX;
_login_box.style.top = loginY;
}
}
document.onmouseup = function() {
_header.onmousemove = null;
}</script>
