Javascript

JS-购物车

本文主要是介绍JS-购物车，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！ 
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.6.0/dist/css/bootstrap.min.css" integrity="sha384-B0vP5xmATw1+K9KRQjQERJvTumQW0nPEzvF6L/Z6nronJ3oUOFUFpCjEUQouq2+l" crossorigin="anonymous">
    <script src="jquery-3.2.1.min.js"></script>
</head>
<body>
    <div id="main">
        <table class="table table-striped">
            <thead>
            <tr>
                <th scope="col">标号</th>
                <th scope="col">名称</th>
                <th scope="col">价格</th>
                <th scope="col">数量</th>
                <th scope="col">小计</th>
                <th scope="col">操作</th>
            </tr>
            </thead>
            <tbody>
            <tr>
                <th scope="row">
                    <input type="checkbox" name="ck" class="ck">
                </th>
                <td>商品一号</td>
                <td>9.91</td>
                <td>
                <button class="btn-up">+</button>
                    <input type="text" name="num" style="width: 30px" value="1">
                    <button class="btn-down">-</button>
                </td>
                <td class="subtotal">9.91</td>
                <td><button class="btn-danger">删除</button></td>
            </tr>
            <tr>
                <th scope="row">
                    <input type="checkbox" name="ck" class="ck">
                </th>
                <td>商品二号</td>
                <td>9.9</td>
                <td>
                    <button class="btn-up">+</button>
                    <input type="text" name="num" style="width: 30px" value="1">
                    <button class="btn-down">-</button>
                </td>
                <td class="subtotal">9.9</td>
                <td><button class="btn-danger">删除</button></td>
            </tr>
            <tr>
                <th scope="row">
                    <input type="checkbox" name="ck" class="ck">
                </th>
                <td>商品三号</td>
                <td>100.23</td>
                <td>
                    <button class="btn-up">+</button>
                    <input type="text" name="num" style="width: 30px" value="1">
                    <button class="btn-down">-</button>
                </td>
                <td class="subtotal">100.23</td>
                <td><button class="btn-danger">删除</button></td>
            </tr>
            </tbody>

        </table>
        <button id="qx">全选</button>
        <button id="qbx">全不选</button>
        <button id="fx">反选</button>
        <button id="plsc">批量删除</button>
        <p style="float: right">
            总共购买<span id="counter">0</span> 件 ;支付总金额:<span id="total">0.00</span>￥
        </p>
    </div>
</body>
</html>
<script>
    //加
    $(".btn-up").click(function () {
        var num = $(this).next().val();
        num++;
        var price = $(this).parent().prev().text();
        var subTotal = price * num;
        $(this).next().val(num);
        $(this).parent().next().html(subTotal.toFixed(2));
        $(this).parent().siblings(":first").find('.ck').prop("checked","checked");
        computed();
    });
    //减
    $(".btn-down").click(function () {
        var num = $(this).prev().val();
        if(num>1){
            num--;
        }
        var price = $(this).parent().prev().text();
        var subTotal = price * num;
        $(this).prev().val(num);
        $(this).parent().next().text(subTotal.toFixed(2));

        computed();
    });
    //计算总金额
    function computed(){
        var total = 0;
        var ele = $("input[name='ck']:checked");
        var counter = ele.length;
        ele.each(function (index,v) {
            //
            total += parseFloat( $(v).parent().parent().find('.subtotal').text());
        });
        $("#counter").html(counter);
        $("#total").html(total).toFixed(2);
    }
    $(".ck").click(function () {
        computed();
    });


    //全选
    $("#qx").click(function () {
        var ck = $("input[name='ck']");
        for(var i=0;i<ck.length;i++){
            ck[i].checked = true;
        }
        computed();
    });
    //全不选
    $("#qbx").click(function () {
        var ck = $("input[name='ck']");
        for(var i=0;i<ck.length;i++){
            ck[i].checked = false;
        }
        computed();
    });
    //反选
    $("#fx").click(function () {
        var ck = $("input[name='ck']");
        for (var i=0;i<ck.length;i++){
            if(ck[i].checked){
                ck[i].checked = false;
            }else{
                ck[i].checked = true;
            }
        }
        computed();
    });

    $(".btn-danger").click(function () {
        $(this).parent().parent().empty();
    });

    $("#plsc").click(function () {
        var ele = $("input[name='ck']:checked");
        for(var i=0;i<ele.length;i++){
            //$(ele[i]).parent().parent().remove();
            $(ele[i]).parent().parent().remove();
        }
        computed();
    });

</script>

　　

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