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。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。