<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
*{
padding: 0;
margin: 0;
}
.box{
width: 211px;
height: 101px;
margin: 200px auto;
border: 2px solid #939090;
display: flex;
}
input{
height: 100px;
outline: none;
border: none;
text-align: center;
}
button{
width: 50px;
height: 50px;
outline: none;
font-size: 30px;
}
.bottom{
display: flex;
flex-direction: column;
border: 1px solid #939090;
}
</style>
</head>
<body>
<div class="box">
<input type="text" value="7">
<div class="bottom">
<button>+</button>
<button>-</button>
</div>
</div>
<script>
//先获取元素
const input=document.querySelector('input')
const btn=document.querySelectorAll('button')
//给加号添加事件
btn[0].addEventListener('click',function() {
input.value++
btn[1].disabled=false
})
//给减号添加事件
btn[1].addEventListener('click',function() {
input.value--
if(input.value<=1){
btn[1].disabled=true
}
})
</script>
</body>
</html>
