jquery实现购物车基本功能

网络编程 2024/11/13 佚名

3 2 1

购物车里的功能无非是商品数量的加减、商品删除、全选反选等操作，其实现过程如下所示：

1.html代码：

<body>
 <div class="empty">
 购物车空空如也，<a href="javascript:void(0);" >快去选购吧</a>
 </div>
 <table border="2px solid #ccc" id="table">
 <thead>
 <th>
 <input type="checkbox" class="checkOnly" style="vertical-align:middle;margin-right:20px;">全选
 </th>
 <th>序号</th>
 <th>商品名称</th>
 <th>数量</th>
 <th>单价</th>
 <th>小计</th>
 <th>操作</th>
 </thead>
 <tbody>
 <tr>
 <td>
 <input type="checkbox" class="check">
 </td>
 <td class="num">1</td>
 <td>烤煎饼</td>
 <td>
 <span>
 <input type="button" value="-" class="reduces">
 <span class="span">1</span>
 <input type="button" value="+" class="adds">
 </span>
 </td>
 <td>单价：
 <span class="price">2</span>
 </td>
 <td>
 小计：
 <span class="prices">2</span>
 </td>
 <td>
 <a href="#" class="del">删除</a>
 </td>
 </tr>
 <tr>
 <td>
 <input type="checkbox" class="check">
 </td>
 <td class="num">2</td>
 <td>珍珠奶茶</td>
 <td>
 <span>
 <input type="button" value="-" class="reduces">
 <span class="span">1</span>
 <input type="button" value="+" class="adds">
 </span>
 </td>
 <td>单价：
 <span class="price">4</span>
 </td>
 <td>
 小计：
 <span class="prices">4</span>
 </td>
 <td>
 <a href="#" class="del">删除</a>
 </td>
 </tr>
 <tr>
 <td>
 <input type="checkbox" class="check">
 </td>
 <td class="num">3</td>
 <td>水煮鱼</td>
 <td>
 <span>
 <input type="button" value="-" class="reduces">
 <span class="span">1</span>
 <input type="button" value="+" class="adds">
 </span>
 </td>
 <td>单价：
 <span class="price">20</span>
 </td>
 <td>
 小计：
 <span class="prices">20</span>
 </td>
 <td>
 <a href="#" class="del">删除</a>
 </td>
 </tr>
 <tr>
 <td>
 <input type="checkbox" class="check">
 </td>
 <td class="num">4</td>
 <td>蛋糕</td>
 <td>
 <span>
 <input type="button" value="-" class="reduces">
 <span class="span">1</span>
 <input type="button" value="+" class="adds">
 </span>
 </td>
 <td>单价：
 <span class="price">50</span>
 </td>
 <td>
 小计：
 <span class="prices">50</span>
 </td>
 <td>
 <a href="#" class="del">删除</a>
 </td>
 </tr>
 <tr>
 <td>
 <input type="checkbox" class="check">
 </td>
 <td class="num">5</td>
 <td>土豆片</td>
 <td>
 <span>
 <input type="button" value="-" class="reduces">
 <span class="span">1</span>
 <input type="button" value="+" class="adds">
 </span>
 </td>
 <td>单价：
 <span class="price">5</span>
 </td>
 <td>
 小计：
 <span class="prices">5</span>
 </td>
 <td>
 <a href="#" class="del">删除</a>
 </td>
 </tr>
 <tr>
 <td>
 <input type="checkbox" class="check">
 </td>
 <td class="num">6</td>
 <td>蛋黄派</td>
 <td>
 <span>
 <input type="button" value="-" class="reduces">
 <span class="span">1</span>
 <input type="button" value="+" class="adds">
 </span>
 </td>
 <td>单价：
 <span class="price">5.5</span>
 </td>
 <td>
 小计：
 <span class="prices">5.5</span>
 </td>
 <td>
 <a href="#" class="del">删除</a>
 </td>
 </tr>
 <tr>
 <td colspan="7" class="talast">
 <span>商品一共
 <span class="goods_num" style="color:red;font-size:20px;">0</span> 件; 共计花费
 <span class="pricetal" style="color:red;font-size:20px;">0</span> 元; 其中最贵的商品单价是
 <span class="pricest" style="color:red;font-size:20px;">0</span> 元</span>
 </td>
 </tr>
 </tbody>
 </table>
</body>

2.css代码：

<style type="text/css">
 table {
 width: 1000px;
 /* height: 300px; */
 border-collapse: collapse;
 table-layout: fixed;
 text-align: center;
 font-size: 18px;
 margin: 0 auto;
 }

 a {
 text-decoration: none;
 color: black;
 }

 tr {
 height: 50px;
 }

 .check {
 width: 20px;
 height: 20px;
 }

 .checkOnly {
 width: 20px;
 height: 20px;
 }

 .empty {
 font-size: 25px;
 position: fixed;
 top: 45%;
 left: 45%;
 display: none;
 }

 .empty a {
 color: pink;
 }

 .empty a:hover {
 text-decoration: underline;
 }
 </style>

3.js代码：

<script src="/UploadFiles/2021-04-02/jquery-1.8.3.min.js">

补充上面js代码中用到的全选反选插件 \color{red}{补充上面js代码中用到的全选反选插件}补充上面js代码中用到的全选反选插件


//1、定义全选的插件
jQuery.fn.extend({
 bindCheck:function($subCheckBox,$btnUncheck){
 let $allCheckBox = this;
 //1、给全选复选框绑定click事件
 //this:是全选复选框（jQuery对象）
 this.click(function(){
 let isChecked = this.checked;
 $subCheckBox.each(function(){
 this.checked = isChecked;
 });
 });
 //2、给反选
 if(arguments.length==2){
 $btnUncheck.click(function(){
 $subCheckBox.each(function(){
 this.checked = !this.checked;
 });
 reversCheck();
 });
 }
 //3、给每个选择项的复选框绑定事件
 $subCheckBox.click(function(){
 reversCheck();
 });
 function reversCheck(){
 //1、判断是否全部的复选框被选中
 let isAllChecked = true;
 $subCheckBox.each(function(){
 if(!this.checked){
 isAllChecked = false;
 }
 });
 //2、处理全选复选框
 $allCheckBox.attr("checked",isAllChecked);
 }
 }
});


效果如下图所示：

以上就是一个功能比较完整的购物车，有问题或者建议欢迎指出。


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