<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
*{
padding: 0;
margin: 0;
}
html,body{
100%;
height: 1200px;
}
#panel{
100%;
height: 100%;
background: #000;
opacity: 0.4;
filter: alpha(opacity:40);
position: absolute;
top:0;
left: 0;
display: none;
}
#login{
300px;
height: 300px;
background: skyblue;
text-align: center;
line-height: 300px;
position: fixed;
left: 50%;
top:50%;
transform: translate(-50%,-50%);
display: none;
}
</style>
</head>
<body>
<button id="btn">立即登录</button>
<div id="panel"></div>
<div id="login">登录面板</div>
<script>
/*
* 如果有document(父子)事件要注意冒泡
* 这里btn事件冒泡到document，使 panel.style.display先block,再none
* */
window.onload=function () {
let btn=document.getElementById("btn")
let panel=document.getElementById("panel")
let login=document.getElementById("login")
btn.onclick=function (event) {
let e=event || window.event
//阻止冒泡
if(e.stopPropagation){
e.stopPropagation()
}else{
e.cancelBubble=true
}
panel.style.display="block"
login.style.display="block"
//隐藏滚动条
document.documentElement.style.overflow="hidden"
}
//点击文档
document.onclick=function () {
let e=window.event || arguments[0]
//获取点击标签的id(兼容)
let target=e.target?e.target.id:e.srcElement.id
if(target!="login"){
panel.style.display="none"
login.style.display="none"
document.documentElement.style.overflow="visible"
}else {
location.href="https://www.baidu.com/"
}
}
}
</script>
</body>
</html>