实现了：第一件商品的加减
实现了：全选/全不选（使用prop而不是attr）
实现了：删除（遮罩层）
未实现：小计及应付款额的初始化（写死的）
计算小数乘法时，要先乘100
<html>
<head>
<meta charset="UTF-8">
<title>购物车</title>
</head>
<script type="text/javascript" src="js/jquery-3.3.1.min.js"></script>
<style>
.div1 {
border: 1px solid gainsboro;
width: 950px;
height: 60px;
}
.div-checkbox,
.div-goods,
.div-amount,
.div-unit-price,
.div-price,
.div-del {
border: 1px solid;
width: 60px;
height: 20px;
padding: 20px;
float: left;
text-align: center;
}
.div-price {
width: 100px;
}
.div-goods {
width: 140px;
}
.div-amount {
width: 140px;
}
.div-unit-price {
width: 50px;
}
.div-total-price {
border: 1px solid gainsboro;
width: 950px;
height: 60px;
text-align: right;
}
.div-submit {
width: 950px;
text-align: right;
}
div#cover {
/*遮罩层*/
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 1000px;
z-index: 100;
display: none;
background-color: grey;
}
div#prompt {
/*弹窗*/
border: 2px solid yellow;
display: none;
position: fixed;
top: 100px;
left: 500px;
z-index: 101;
width: 300px;
height: 200px;
}
</style>
<script>
$(function() {
//全选
var i = 0;
$(".allPic").click(function() {
i++;
if (i % 2 != 0) {
//此处用attr则只能选中/取消一次
$(".cls-checked").prop("checked", true);
} else {
$(".cls-checked").prop("checked", false);
}
});
//通过name获取某一商品的按钮
$("input[name='btn1']").click(function() {
//数量
var _amount = parseInt($("#id-txt-amount1").val());
if ($(this).val() == "+") {
_amount++;
} else if ($(this).val() == "-") {
if (_amount == 1) {
//必须买!
return;
}
_amount--;
}
$("#id-txt-amount1").attr("value", _amount);
// 本商品的总价
var _unitPrice = $("#id-unit-price1").html();
var _thisPrice = parseFloat(_unitPrice * 100 * _amount / 100).toFixed(2);
$("#id-price1").html(_thisPrice);
// 总价
var _otherPrice = $("#id-price2").html();
var _totalPrice = parseFloat(_thisPrice + _otherPrice).toFixed(2);
$("#id-total-price").html(_totalPrice);
});
//删除一条
$(".div-del a").click(function() {
showPrompt(this);
});
});
function showPrompt(obj) {
$("#cover").css("display", "block");
// 10毫秒内透明度降为0.5
$("#cover").fadeTo(10, 0.5);
$("#prompt").css("display", "block");
$("#prompt a").click(function() {
$("#cover").css("display", "none");
$("#prompt").css("display", "none");
return;
});
$("#prompt input").click(function() {
$("#cover").css("display", "none");
$("#prompt").css("display", "none");
$(obj).each(function() {
$(obj).parent("div").parent("div").remove();
});
});
}
</script>
<body>
<!--遮罩层-->
<div id="cover"></div>
<!--弹窗-->
<div id="prompt">
<div style="width: 100%;height: 20px;text-align: right;background-color: gray;">
<a href="#">关闭</a>
</div>
<div style="text-align: center;background-color: white;width: 300px;height: 180px;line-height: 100px;">
确认删除吗？
<br />
<input type="button" value="确定" />
</div>
</div>
<!--表头------------------------------------------------------->
<div class="div1">
<div class="div-checkbox">
<input type="checkbox" class="allPic"><b>全选</b></input>
</div>
<div class="div-goods"><b>项目</b></div>
<div class="div-amount"><b>数量</b></div>
<div class="div-unit-price"><b>单价</b></div>
<div class="div-price"><b>小计</b></div>
<div class="div-del"></div>
</div>
<!--第一行------------------------------------------------------->
<div class="div1">
<div class="div-checkbox">
<input type="checkbox" class="cls-checked" />
</div>
<div class="div-goods">
A
</div>
<div class="div-amount">
<input type="button" value="-" name="btn1" />
<input type="text" size="2" value="1" id="id-txt-amount1" />
<input type="button" value="+" name="btn1" />
</div>
<div class="div-unit-price">
￥<span id="id-unit-price1">9.90</span>
</div>
<div class="div-price">￥<span id="id-price1">2.00</span></div>
<div class="div-del"><a href="#">删除</a></div>
</div>
<!--第二行（未实现加减）------------------------------------------------------->
<div class="div1">
<div class="div-checkbox">
<input type="checkbox" class="cls-checked" />
</div>
<div class="div-goods">
B
</div>
<div class="div-amount">
<input type="button" value="-" class="btn2" />
<input type="text" size="2" value="1" id="id-txt-amount2" />
<input type="button" value="+" class="btn2" />
</div>
<div class="div-unit-price">
￥<span id="id-unit-price2">2.00</span>
</div>
<div class="div-price">￥<span id="id-price2">2.00</span></div>
<div class="div-del"><a href="#">删除</a></div>
</div>
<div class="div-total-price">应付款额： ￥
<span id="id-total-price">11.90</span>
</div>
<div class="div-submit">
<input type="submit" />
</div>
</body>
</html>原文：https://www.cnblogs.com/tigerlion/p/11178802.html