JavaScript实现html购物车代码<!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">
<script src="jquery-3.4.1.js" type="text/javascript" charset="utf-8"></script>
<title>购物车</title>
<style>
input{
width:25px;
}
</style>
</head>
<body>
<div>
<table border="1" cellspacing="0" cellpadding="10px">
<thead>
<th><input type='checkbox'></th>
<th>商品</th>
<th>数量</th>
<th>单价</th>
<th>状态</th>
<th>库存</th>
<th>⼩计</th>
</thead>
<tbody>
<tr>
<td><input type='checkbox'></td>
<td>语⾳电⼦红外体温计</td>
<td>
<button class="jian">-</button>
<input type="number" maxlength="2" value="0" disabled>
<button class="jia">+</button>
</td>
<td>
69.00
</td>
<td>
有货
</td>
<td>20</td>
<td class="xiaoji"></td>
</tr>
<tr>
<td><input type='checkbox'></td>
<td>⼉童防晒⾐</td>
<td>
<button class="jian">-</button>
<input type="number" maxlength="2" value="0" disabled>
<button class="jia">+</button>
</td>
<td>
109.00
</td>
<td>
有货
</td>
<td>20</td>
<td class="xiaoji"></td>
</tr>
<tr>
<td><input type='checkbox'></td>
<td>⼩黄鸭玩具</td>
<td>
<button class="jian">-</button>
<input type="number" maxlength="2" value="0" disabled>
<button class="jia">+</button>
</td>
<td>
9.90
</td>
<td>
有货
</td>
<td>20</td>
<td class="xiaoji"></td>
</tr>
<tr>
<td><input type='checkbox'></td>
<td>⼉童滑板车</td>
<td>
<button class="jian">-</button>
<input type="number" maxlength="2" value="0" disabled>                        <button class="jia">+</button>
</td>
<td>
169.00
</td>
<td>
有货
</td>
<td>20</td>
<td class="xiaoji"></td>
</tr>
<tr>
<td><input type='checkbox'></td>
<td>轻薄长裤</td>
<td>
网页购物车代码
<button class="jian">-</button>
<input type="number" maxlength="2" value="0" disabled>                        <button class="jia">+</button>
</td>
<td>
39.00
</td>
<td>
有货
</td>
<td>20</td>
<td class="xiaoji"></td>
</tr>
<tr>
<td><input type='checkbox'></td>
<td>⼉童防蚊裤</td>
<td>
<button class="jian">-</button>
<input type="number" maxlength="2" value="0" disabled>                        <button class="jia">+</button>
</td>
<td>
29.00
</td>
<td>
有货
</td>
<td>20</td>
<td class="xiaoji"></td>
</tr>
</tbody>
<tfoot>
<tr>
<td colspan="5"></td>
<td>总计</td>
<td class="total"></td>
</tr>
</tfoot>
</table>
</div>
<script type="text/javascript">
$(".jia").click(function  () {
var num = $(this).prev().val();
if(num==20){
return;
}
$(this).prev().val(parseInt(++num));
$(this).parent().next().next().next().text(20-num)
if ($(this).parent().next().next().next().text()==0) {
$(this).parent().next().next().text('⽆货')
}
money ()
})
$(".jian").click(function  () {
var num = $(this).next().val();
if(num==0){
return;
}
$(this).next().val(parseInt(--num));
$(this).parent().next().next().next().text(20-num)
$(this).parent().next().next().text('有货')  money ()
})
function money () {
var price=$('.jia').parent().next();
var num= $('.jia').prev();
var xiaoji = $('.xiaoji');
var sum = 0.0;
for (var i=0;i<price.length;i++) {
var price1 = parseFloat(price.eq(i).text());  var num1 = parseFloat(num.eq(i).val());  // alert(price1*num1)
xiaoji.eq(i).text((price1*num1).toFixed(2))  sum+=price1*num1;
}
$('.total').Fixed(2));
}
</script>
</body>
</html>

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