1，要求
点击登录按钮，弹出登录窗口
提示1：登录窗口 display:none 隐藏状态；
提示2：登录按钮点击后，触发事件，修改 display:block 显示状态
提示3：登录窗口中点击关闭按钮，触发事件，修改 display:none 隐藏状态
代码演示
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>登录窗口</title>
<style>
*{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: 300px;
height: 200px;
background-color: #fff;
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;
}
</style>
</head>
<body>
<div class="container">
<header>
<div>
<span>欢迎访问OPENLAB</span>
</div>
<div>
<span id="login">登录</span>
<span id="register">注册</span>
</div>
<!-- 登录框 -->
<div class="login-box" id="login-box">
<div class="header" id="header">
<span>会员登录</span>
<span id="close">[关闭]</span>
</div>
</div>
</header>
</div>
<script>
//获取登录按钮
let _login = document.getElementById("login");
let _login_box = document.getElementById("login-box");
//登录按钮添加事件
_login.onclick = function(){
_login_box.style.display = "block";
}
//获取关闭按钮
let _close = document.getElementById("close");
_close.onclick = function(){
_login_box.style.display = "none";
}
let _header = document.getElementById("header");
//鼠标按下事件
document.onmousedown = function(event){
let offsetX = event.offsetX;
let offsetY = event.offsetY;
//窗口移动事件
_header.onmousemove = function(event2){
let mouseX = event2.clientX;
let mouseY = event2.clientY;
let loginX = mouseX - offsetX;
let loginY = mouseY - offsetY;
//------------------边界判断
//左边界
if(loginX <= 0){
loginX = 0;
}
//上边界
if(loginY <= 0){
loginY = 0;
}
//右边界
let iw = window.innerWidth; //浏览器窗口宽度
let lw = getComputedStyle(_login_box).width; //登录窗宽度
lw = parseInt(lw); //转换数据类型
if(loginX >= (iw - lw)){
loginX = iw - lw;
}
//下边界
let ih = window.innerHeight;
let lh = getComputedStyle(_login_box).height;
lh = parseInt(lh);
if(loginY >= (ih - lh)){
loginY = ih - lh;
}
//设置登录样式
_login_box.style.left = loginX + "px";
_login_box.style.top = loginY + "px";
}
}
//鼠标抬起事件
document.onmouseup = function(){
_header.onmousemove = null;
}
</script>
</body>
</html>效果
