<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<style type="text/css">
*{
padding: 0;
margin: 0;
}
.num {
margin-top:20px;
margin-left: 20px;
height: 100%;
width: 160px;
display: flex;
border-radius: 4px;
overflow: hidden;
box-shadow: 4px 4px 4px #adadad;
border: 1px solid #c7c7c7;
background-color: #c7c7c7;
}
.num button {
width: 50px;
height: 100%;
font-size: 30px;
line-height: 40px;
color: #000;
cursor: pointer;
border: none;
outline: none;
background-color:rgba(0, 0, 0, 0);
}
.num span {
height: 100%;
font-size: 20px;
flex: 1;
text-align: center;
line-height: 40px;
font-family:auto;
background-color: white;
}
</style>
<body>
<div class="num">
<!-- - -->
<button type="button">-</button>
<!-- 内容 -->
<span>0</span>
<!-- + -->
<button type="button">+</button>
</div>
</body>
<script src="https://code.jquery.com/jquery-3.6.0.min.js" type="text/javascript" charset="utf-8"></script>
<script type="text/javascript">
// +
$('.num button:last-child').click(function(){
let num=$('.num span').text()
num++
$('.num span').text(num)
})
// -
$('.num button:first-child').click(function(){
let num=$('.num span').text()
if(num>0){
num--
$('.num span').text(num)
}else{
alert('不能再点了')
}
})
</script>
</html>
效果图
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