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jQuery实现简易购物车功能

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Html

<!DOCTYPE html><html lang="en"><head>    <meta charset="UTF-8">    <meta name="viewport" content="width=device-width, initial-scale=1.0">    <title></title>    <script src="js/jquery-3.4.1.min.js"></script>    <link rel="stylesheet" href="bootstrap-3.4.1/css/bootstrap.min.css">    <script src="js/jquery_shopping.js"></script></head><body>    <div class="panel-group">         <div class="panel panel-primary">            <table class="table table-bordered table-striped table-hover table-condensed" id="tab_s">                <thead>                     <tr class="info">                        <th>商品名称</th>                        <th>单价</th>                        <th>数量</th>                        <th>小计</th>                        <th>操作</th>                    </tr>                </thead>                <tbody id="tby">                    <tr>                        <td>电脑</td>                        <td class="price">¥3999.00</td>                        <td>                            <div class="row">                                <div class="col-md-1">                                    <button type="button" class="btn btn-default btn-sm" name="sub">                                        <span class="glyphicon glyphicon-minus" aria-hidden="true"></span>                                    </button>                                </div>                                <div class="col-md-1">                                    <input class="form-control input-sm" type="text" name="num" value="1" placeholder="请输入数量">                                </div>                                <div class="col-md-1">                                    <button type="button" class="btn btn-default btn-sm" name="add">                                        <span class="glyphicon glyphicon-plus" aria-hidden="true"></span>                                    </button>                                </div>                            </div>                        </td>                        <td class="small_total">¥3999.00</td>                        <td>                            <button type="button" class="btn btn-default btn-sm" name="delete">                                <span class="glyphicon glyphicon-remove"> 删除</span>                            </button>                         </td>                    </tr>                    <tr>                        <td>手机</td>                        <td class="price">¥1998.00</td>                        <td>                            <div class="row">                                <div class="col-md-1">                                    <button type="button" class="btn btn-default btn-sm" name="sub">                                        <span class="glyphicon glyphicon-minus" aria-hidden="true"></span>                                    </button>                                </div>                                <div class="col-md-1">                                    <input class="form-control input-sm" type="text" name="num"  value="1" placeholder="请输入数量">                                </div>                                <div class="col-md-1">                                    <button type="button" class="btn btn-default btn-sm" name="add">                                        <span class="glyphicon glyphicon-plus" aria-hidden="true"></span>                                    </button>                                </div>                            </div>                        </td>                        <td class="small_total">¥1998.00</td>                        <td>                            <button type="button" class="btn btn-default btn-sm" name="delete">                            <span class="glyphicon glyphicon-remove"> 删除</span>                            </button>                        </td>                    </tr>                    <tr>                        <td>空调</td>                        <td class="price">¥2099.00</td>                        <td>                            <div class="row">                                <div class="col-md-1">                                    <button type="button" class="btn btn-default btn-sm" name="sub">                                        <span class="glyphicon glyphicon-minus" aria-hidden="true"></span>                                    </button>                                </div>                                <div class="col-md-1">                                    <input class="form-control input-sm" type="text" name="num" value="1" placeholder="请输入数量">                                </div>                                <div class="col-md-1">                                    <button type="button" class="btn btn-default btn-sm" name="add">                                        <span class="glyphicon glyphicon-plus" aria-hidden="true"></span>                                    </button>                                </div>                            </div>                        </td>                        <td class="small_total">¥2099.00</td>                        <td>                            <button type="button" class="btn btn-default btn-sm" name="delete">                                <span class="glyphicon glyphicon-remove"> 删除</span>                            </button>                        </td>                    </tr>                </tbody>            </table>            <div class="panel-footer">                <span>已选<span style="color: red;" class="num_sum">1</span>件商品</span>                <span>总计:</span>                <span class="sum" style="color: red;">0</span>                <div>                    <button type="button" class="btn btn-default btn-sm" name="delSome">                        删除选中商品                    </button>                    <button type="button" class="btn btn-default btn-sm" name="delAll">                        清空购物车                    </button>                                    </div>            </div>        </div>    </div></body></html>

Js代码:

$(function(){     function initTableCheckbox() {         var $thr = $('table thead tr');        var $checkAllTh = $('<th><input type="checkbox" id="checkAll" name="checkAll" /></th>');        /*将全选/反选复选框添加到表头最前,即增加一列*/         $thr.prepend($checkAllTh);        var $checkAll = $thr.find('input');          $checkAll.click(function(event){              /*将所有行的选中状态设成全选框的选中状态*/              $tbr.find('input').prop('checked',$(this).prop('checked'));              /*并调整所有选中行的CSS样式*/              if ($(this).prop('checked')) {                  $tbr.find('input').parent().parent().addClass('warning');              }             else{                  $tbr.find('input').parent().parent().removeClass('warning');              }            getSum();            /*阻止向上冒泡,以防再次触发点击操作*/              event.stopPropagation();          });        /*点击全选框所在单元格时也触发全选框的点击操作*/          $checkAllTh.click(function(){            $(this).find('input:[type="checkbox"]').click();          });          var $tbr = $('table tbody tr');          var $checkItemTd = $('<td><input type="checkbox" name="checkItem" class="chk_itm"/></td>');          /*每一行都在最前面插入一个选中复选框的单元格*/          $tbr.prepend($checkItemTd);        /*点击每一行的选中复选框时*/        /*        $tbr.find('input').click(function(event){              //调整选中行的CSS样式             $(this).parent().parent().toggleClass('warning');              //如果已经被选中行的行数等于表格的数据行数,将全选框设为选中状态,否则设为未选中状态            $checkAll.prop('checked',$tbr.find('input:checked').length == $tbr.length ? true : false);              //阻止向上冒泡,以防再次触发点击操作            event.stopPropagation();          });          //点击每一行时也触发该行的选中操作         $tbr.click(function(){              $(this).find('input').click();          });        */    }      initTableCheckbox();    getSum();    $(".chk_itm").change(function() {        getSum();    });       //添加商品    $("button[name='add']").click(function() {        let n = parseInt($(this).parent().siblings().find("input[name='num']").val());        console.log("添加商品的num:"+n);        n++;        $(this).parent().siblings().find("input[name='num']").val(n);        let price = $(this).parent().parent().parent().siblings(".price").html();        price = price.substr(1);        console.log("添加商品的price:"+price);        $(this).parent().parent().parent().siblings(".small_total").text("¥" + (n * price).toFixed(2));        getSum();    });    //减少商品    $("button[name='sub']").click(function() {        let n = parseInt($(this).parent().siblings().find("input[name='num']").val());        console.log("减少商品的num:"+n);        if (n === 1) {         return false;        }        n--;        $(this).parent().siblings().find("input[name='num']").val(n);        let price = $(this).parent().parent().parent().siblings(".price").html();        price = price.substr(1);        console.log("减少商品的price:"+price);        $(this).parent().parent().parent().siblings(".small_total").text("¥" + (n * price).toFixed(2));        getSum();    });    $("input[name='num']").change(function() {        let n = $(this).val();        console.log("数量num:"+n);        let price = $(this).parent().parent().parent().siblings(".price").html();        price = price.substr(1);        console.log("价格price:"+price);        $(this).parent().parent().parent().siblings(".small_total").text("¥" + (n * price).toFixed(2));        getSum();    });    function getSum() {        let count = 0; //计算总件数        let money = 0; //计算总价钱        $("input[name='num']").each(function(index) {            if ($(".chk_itm").eq(index).prop("checked") == true) {                count += parseInt($("input[name='num']").eq(index).val());                money += parseFloat($(".small_total").eq(index).text().substr(1));            }        });        $(".num_sum").html(count);        $(".sum").html(money.toFixed(2));    }    //点击删除之后一定是删除当前的商品,获取this    $("button[name='delete']").click(function() {        //删除的是当前的商品        $(this).parent().parent().remove();        $(".chk_itm").change();        getSum();        clearCheckAll();   });   //删除选定的商品:小的复选框如果选中就删除对应的商品   //删除的是选中的商品   $("button[name='delSome']").click(function() {        //删除的是选中的商品        $(".chk_itm:checked").parent().parent().remove();        getSum();        clearCheckAll();   });   //清空购物车   $("button[name='delAll']").click(function() {    $("#tby").empty();    getSum();    clearCheckAll();   });   function clearCheckAll() {    if ($("#tby").innerText == '') {     $(".checkAll").prop("checked", false);    }   }});

效果

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