实现原理：display：none/block; 把代码直接复制看效果
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
* {
padding: 0;
margin: 0;
}
.firstBox h5 {
font-size: 30px;
color: #000;
font-weight: 700;
}
.firstBox table {
border: 1px solid #E6E6E6;
margin: 15px 0px;
}
.firstBox table thead {
background: #E6E6E6;
}
.firstBox table tr td {
width: 150px;
text-align: center;
}
.firstBox button {
width: 100px;
height: 40px;
background: #E6E6E6;
border: 1px solid #C7D3E6;
text-align: center;
line-height: 40px;
font-size: 16px;
color: #000;
cursor: pointer;
}
#twoBox {
margin: 20px 0px 0px;
background: #E6E6E6;
height: 250px;
width: 310px;
position: relative;
display: none;
}
#twoBox .twoBox_lever {
width: 290px;
height: 230px;
background: #fff;
border: 1px solid #ccc;
border-radius: 5px;
position: absolute;
right: 0;
top: 0;
left: 0;
bottom: 0;
margin: auto;
}
.twoBox_lever_two {
width: calc(100% - 10px);
height: calc(100% - 10px);
padding: 5px;
}
.twoBox_lever_two .two_title {
width: 100%;
height: 40px;
background: #E6E6E6;
border: 1px solid #ccc;
border-radius: 5px;
}
.twoBox_lever_two .two_title p {
font-size: 16px;
color: #000;
line-height: 40px;
padding-left: 10px;
font-weight: 700;
}
.twoBox_lever_two form {
width: calc(100% - 20px);
margin: 10px;
border-bottom: 1px solid #ccc;
height: calc(100% - 100px);
}
.twoBox_lever_two form input {
height: 20px;
line-height: 20px;
padding: 0px 10px;
margin: 5px;
cursor: pointer;
}
.twoBox_lever_two .two_footer {
height: 40px;
text-align: right;
padding-right: 10px;
}
.twoBox_lever_two .two_footer button {
height: 30px;
background: #E6E6E6;
border: 1px solid #C7D3E6;
text-align: center;
line-height: 30px;
font-size: 16px;
color: #000;
cursor: pointer;
}
.twoBox_lever_two .two_footer button:first-of-type {
width: 120px;
padding: 0px 10px;
}
.twoBox_lever_two .two_footer button:last-of-type {
width: 50px;
}
.show {
display: block !important;
}
</style>
</head>
<body>
<div style="margin:10px;">
<!-- 第一部分 -->
<div class="firstBox">
<h5>已有的用户 ：</h5>
<table>
<thead>
<tr>
<th>名字</th>
<th>邮箱</th>
<th>密码</th>
</tr>
</thead>
<tbody>
<tr>
<td>姓名</td>
<td>xingtuan@qq.com</td>
<td>xingtuan</td>
</tr>
</tbody>
</table>
<button id="button">创建新用户</button>
</div>
<!-- 第二部分 -->
<div id="twoBox">
<div class="twoBox_lever">
<div class="twoBox_lever_two">
<div class="two_title">
<p>创建新用户</p>
</div>
<form>
<label style="float:left">名字：
<input type="text" placeholder="请输入名字">
</label>
<label style="float:left">邮箱：
<input type="text" placeholder="请输入邮箱">
</label>
<label style="float:left">密码：
<input type="password" placeholder="请输入密码">
</label>
</form>
<div class="two_footer">
<button>创建一个用户</button>
<button>取消</button>
</div>
</div>
</div>
</div>
</div>
</body>
<script>
window.onload = function () {
document.getElementById("button").onclick = function () {
document.getElementById("twoBox").classList.add("show")
}
}
</script>
</html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
* {
padding: 0;
margin: 0;
}
.firstBox h5 {
font-size: 30px;
color: #000;
font-weight: 700;
}
.firstBox table {
border: 1px solid #E6E6E6;
margin: 15px 0px;
}
.firstBox table thead {
background: #E6E6E6;
}
.firstBox table tr td {
width: 150px;
text-align: center;
}
.firstBox button {
width: 100px;
height: 40px;
background: #E6E6E6;
border: 1px solid #C7D3E6;
text-align: center;
line-height: 40px;
font-size: 16px;
color: #000;
cursor: pointer;
}
#twoBox {
margin: 20px 0px 0px;
background: #E6E6E6;
height: 250px;
width: 310px;
position: relative;
display: none;
}
#twoBox .twoBox_lever {
width: 290px;
height: 230px;
background: #fff;
border: 1px solid #ccc;
border-radius: 5px;
position: absolute;
right: 0;
top: 0;
left: 0;
bottom: 0;
margin: auto;
}
.twoBox_lever_two {
width: calc(100% - 10px);
height: calc(100% - 10px);
padding: 5px;
}
.twoBox_lever_two .two_title {
width: 100%;
height: 40px;
background: #E6E6E6;
border: 1px solid #ccc;
border-radius: 5px;
}
.twoBox_lever_two .two_title p {
font-size: 16px;
color: #000;
line-height: 40px;
padding-left: 10px;
font-weight: 700;
}
.twoBox_lever_two form {
width: calc(100% - 20px);
margin: 10px;
border-bottom: 1px solid #ccc;
height: calc(100% - 100px);
}
.twoBox_lever_two form input {
height: 20px;
line-height: 20px;
padding: 0px 10px;
margin: 5px;
cursor: pointer;
}
.twoBox_lever_two .two_footer {
height: 40px;
text-align: right;
padding-right: 10px;
}
.twoBox_lever_two .two_footer button {
height: 30px;
background: #E6E6E6;
border: 1px solid #C7D3E6;
text-align: center;
line-height: 30px;
font-size: 16px;
color: #000;
cursor: pointer;
}
.twoBox_lever_two .two_footer button:first-of-type {
width: 120px;
padding: 0px 10px;
}
.twoBox_lever_two .two_footer button:last-of-type {
width: 50px;
}
.show {
display: block !important;
}
</style>
</head>
<body>
<div style="margin:10px;">
<!-- 第一部分 -->
<div class="firstBox">
<h5>已有的用户 ：</h5>
<table>
<thead>
<tr>
<th>名字</th>
<th>邮箱</th>
<th>密码</th>
</tr>
</thead>
<tbody>
<tr>
<td>姓名</td>
<td>xingtuan@qq.com</td>
<td>xingtuan</td>
</tr>
</tbody>
</table>
<button id="button">创建新用户</button>
</div>
<!-- 第二部分 -->
<div id="twoBox">
<div class="twoBox_lever">
<div class="twoBox_lever_two">
<div class="two_title">
<p>创建新用户</p>
</div>
<form>
<label style="float:left">名字：
<input type="text" placeholder="请输入名字">
</label>
<label style="float:left">邮箱：
<input type="text" placeholder="请输入邮箱">
</label>
<label style="float:left">密码：
<input type="password" placeholder="请输入密码">
</label>
</form>
<div class="two_footer">
<button>创建一个用户</button>
<button>取消</button>
</div>
</div>
</div>
</div>
</div>
</body>
<script>
window.onload = function () {
document.getElementById("button").onclick = function () {
document.getElementById("twoBox").classList.add("show")
}
}
</script>
</html>
弹出框 我一般用的都是 layui 前端框架 去官网下载 放到本地
