<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
.back{
background-color: rebeccapurple;
height: 2000px;
}
.shade{
position: fixed;
top: 0;
bottom: 0;
left:0;
right: 0;
background-color: coral;
opacity: 0.4;
}
.hide{
display: none;
}
.models{
position: fixed;
top: 50%;
left: 50%;
margin-left: -100px;
margin-top: -100px;
height: 200px;
width: 200px;
background-color: gold;
}
</style>
</head>
<body>
<div class="back">
<input id="ID1" type="button" value="click" onclick="action1(this)">
</div>
<div class="shade hide"></div>
<div class="models hide">
<input id="ID2" type="button" value="cancel" onclick="action2(this)">
</div>
<script src="jquery-3.1.1.js"></script>
<script>
function action1(self) {
$(self).parent().siblings().removeClass("hide");
}
function action2(self) {
$(self).parent().parent().children(".shade,.models").addClass("hide")
}
// function action(act){
// var ele=document.getElementsByClassName("shade")[0];
// var ele2=document.getElementsByClassName("models")[0];
// if(act=="show"){
// ele.classList.remove("hide");
// ele2.classList.remove("hide");
// }else {
// ele.classList.add("hide");
// ele2.classList.add("hide");
// }
// }
</script>
</body>
</html>
原文：https://www.cnblogs.com/gerenboke/p/11771841.html