<!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>
</head>
<body>
<input type="button" value="+" class="jia">
<span>1</span>
<input type="button" value="-" class="jian">
</body>
</html>
<script>
var jia=document.querySelector(".jia");
var jian=document.querySelector(".jian");
var mun=document.querySelector("span");
// console.log(mun)
jia.οnclick=function(){
// console.log(1122)
if(mun.innerText>=10){
alert("限购十个");
return;
}
mun.innerText++;
}
jian.οnclick=function(){
if(mun.innerText<=0){
// alert("")
return;
}
mun.innerText--
}
</script>购物车简单加减js
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转载自blog.csdn.net/Hgh_1997/article/details/82222352
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