本文实例为大家分享了HTML简单购物数量小程序，供大家参考，具体内容如下
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<html>
<head>
<title>购物数量小程序</title>
<script>
function sub()
{
var a = buy.ans.value;
//alert(a);
a = parseInt(a);
a--;
if(a<0)
a = 0;
buy.ans.value = a;
}
function add()
{
var a = buy.ans.value;
a = parseInt(a);
a++;
buy.ans.value = a;
}
</script>
</head>
<body>
<form name="buy">
购买数量<input type="button" value="-" onclick="sub()">
<input type="text" name="ans" value="1">
<input type="button" value="+" onclick="add()">
</form>
</body>
</html>
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