js实现购物车(源码)

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首先是页面布局html+css部分

<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>演示</title>
<link rel="stylesheet" href="css/style.css">
<script type="text/javascript" src="js/demo.js"></script>
</head>
<body>
<table id="cartTable">
<thead>
<tr>
<th><label><input class="check-all check" type="checkbox"/> 全选<label></th>
<th>商品</th>
<th>单价</th>
<th>数量</th>
<th>小计</th>
<th>操作</th>
</tr>
</thead>
<tbody>
<tr>
<td class="checkbox"><input class="check-one check" type="checkbox"/></td>
<td class="goods"><img src="data:images/1.jpg" alt=""/><span>Casio/卡西欧 EX-TR350</span></td>
<td class="price">5999.88</td>
<td class="count"><span class="reduce"></span><input class="count-input" type="text" value="1"/><span class="add">+</span></td>
<td class="subtotal">5999.88</td>
<td class="operation"><span class="delete">删除<span></td>
</tr>
<tr>
<td class="checkbox"><input class="check-one check" type="checkbox"/></td>
<td class="goods"><img src="data:images/2.jpg" alt=""/><span>Casio/卡西欧 EX-TR350</span></td>
<td class="price">5999.88</td>
<td class="count"><span class="reduce"></span><input class="count-input" type="text" value="1"/><span class="add">+</span></td>
<td class="subtotal">5999.88</td>
<td class="operation"><span class="delete">删除<span></td>
</tr>
<tr>
<td class="checkbox"><input class="check-one check" type="checkbox"/></td>
<td class="goods"><img src="data:images/3.jpg" alt=""/><span>Casio/卡西欧 EX-TR350</span></td>
<td class="price">5999.88</td>
<td class="count"><span class="reduce"></span><input class="count-input" type="text" value="1"/><span class="add">+</span></td>
<td class="subtotal">5999.88</td>
<td class="operation"><span class="delete">删除<span></td>
</tr>
<tr>
<td class="checkbox"><input class="check-one check" type="checkbox"/></td>
<td class="goods"><img src="data:images/4.jpg" alt=""/><span>Casio/卡西欧 EX-TR350</span></td>
<td class="price">5999.88</td>
<td class="count"><span class="reduce"></span><input class="count-input" type="text" value="1"/><span class="add">+</span></td>
<td class="subtotal">5999.88</td>
<td class="operation"><span class="delete">删除<span></td>
</tr>

</tbody>
</table>
<div class="foot" id="foot">
<label class="f1 select-all"><input type="checkbox" class="check-all check"/> 全选</label>
<a class="f1 delete" id="deleteAll" href="javascript:;">删除</a>
<div class="fr closing">结算</div>
<div class="fr total">合计：￥<span id="priceTotal">0.00</span></div>
<div class="fr selected" id="selected">已选商品<span id="selectedTotal">0</span>件<span class="arrow up">︽</span><span class="arrow down">︾</span></div>

//***************************************************

* {
margin: 0;
padding: 0;
}
a {
color: #666;
text-decoration: none;
}
body {
padding: 20px;
color: #666;
}
.fl{
float: left;
}
.fr {
float: right;
}
table {
border-collapse: collapse;
border-spacing: 0;
border: 0;
text-align: center;
width: 937px;
}
th, td {
border: 1px solid #CADEFF;
}
th {
background: #e2f2ff;
border-top: 3px solid #a7cbff;
height: 30px;
}
td {
padding: 10px;
color: #444;
}
tbody tr:hover {
background: RGB(238,246,255);
}
.checkbox {
width: 60px;
}
.goods {
width: 300px;
}
.goods span {
width: 180px;
margin-top: 20px;
text-align: left;
float: left;
}
.price {
width: 130px;
}
.count {
width: 90px;
}
.count .add, .count input, .count .reduce {
float: left;
margin-right: -1px;
position: relative;
z-index: 0;
}
.count .add, .count .reduce {
height: 23px;
width: 17px;
border: 1px solid #e5e5e5;
background: #f0f0f0;
text-align: center;
line-height: 23px;
color: #444;
}
.count .add:hover, .count .reduce:hover {
color: #f50;
z-index: 3;
border-color: #f60;
cursor: pointer;
}
.count input {
width: 50px;
height: 15px;
line-height: 15px;
border: 1px solid #aaa;
color: #343434;
text-align: center;
padding: 4px 0;
background-color: #fff;
z-index: 2;
}
.subtotal {
width: 150px;
color: red;
font-weight: bold;
}
.operation {
width: 80px;
}
.operation span:hover, a:hover {
cursor: pointer;
color: red;
text-decoration: underline;
}
img {
width: 100px;
height: 80px;
/*border: 1px solid #ccc;*/
margin-right: 10px;
float: left;
}

.foot {
width: 935px;
margin-top: 10px;
color: #666;
height: 48px;
border: 1px solid #c8c8c8;
background-color: #eaeaea;
background-image:linear-gradient(RGB(241,241,241),RGB(226,226,226));
position: relative;
z-index: 8;
}
.foot div, .foot a {
line-height: 48px;
height: 48px;
}
.foot .select-all {
width: 100px;
height: 48px;
line-height: 48px;
padding-left: 5px;
color: #666;
}
.foot .closing {
border-left: 1px solid #c8c8c8;
width: 100px;
text-align: center;
color: #000;
font-weight: bold;
background: RGB(238,238,238);
cursor: pointer;
}
.foot .total{
margin: 0 20px;
cursor: pointer;
}
.foot #priceTotal, .foot #selectedTotal {
color: red;
font-family: "Microsoft Yahei";
font-weight: bold;
}
.foot .selected {
cursor: pointer;
}
.foot .selected .arrow {
position: relative;
top:-3px;
margin-left: 3px;
}
.foot .selected .down {
position: relative;
top:3px;
display: none;
}
.show .selected .down {
display: inline;
}
.show .selected .up {
display: none;
}
.foot .selected:hover .arrow {
color: red;
}
.foot .selected-view {
width: 935px;
border: 1px solid #c8c8c8;
position: absolute;
height: auto;
background: #ffffff;
z-index: 9;
bottom: 48px;
left: -1px;
display:none;
}
.show .selected-view {
display: block;
}
.foot .selected-view div{
height: auto;
}
.foot .selected-view .arrow {
font-size: 16px;
line-height: 100%;
color:#c8c8c8;
position: absolute;
right: 330px;
bottom: -9px;
}
.foot .selected-view .arrow span {
color: #ffffff;
position: absolute;
left: 0px;
bottom: 1px;
}
#selectedViewList {
padding: 20px;
margin-bottom: -20px;
}
#selectedViewList div{
display: inline-block;
position: relative;
width: 100px;
height: 80px;
border: 1px solid #ccc;
margin: 10px;
}
#selectedViewList div span {
display: none;
color: #ffffff;
font-size: 12px;
position: absolute;
top: 0px;
right: 0px;
width: 60px;
height: 18px;
line-height: 18px;
text-align: center;
background: RGBA(0,0,0,.5);
cursor: pointer;
}
#selectedViewList div:hover span {
display: block;
}
//js部分

/**
* Created by double
*/

var table = document.getElementById('cartTable'); // 购物车表格
var selectInputs = document.getElementsByClassName('check'); // 所有勾选框
var checkAllInputs = document.getElementsByClassName('check-all') // 全选框
var tr = table.children[1].rows; //行
var selectedTotal = document.getElementById('selectedTotal'); //已选商品数目容器
var priceTotal = document.getElementById('priceTotal'); //总计
var deleteAll = document.getElementById('deleteAll'); // 删除全部按钮
var selectedViewList = document.getElementById('selectedViewList'); //浮层已选商品列表容器
var selected = document.getElementById('selected'); //已选商品
var foot = document.getElementById('foot');

// 更新总数和总价格，已选浮层
function getTotal(){
var selected = 0,price = 0, html = '';
for(var i = 0; i < tr.length; i++){
if(tr[i].getElementsByTagName('input')[0].checked){
tr[i].className = 'on';
selected += parseInt(tr[i].getElementsByTagName('input')[1].value);
price += parseFloat(tr[i].getElementsByTagName('td')[4].innerHTML);
html += '<div><img src="'+tr[i].getElementsByTagName('img')[0].src+'"><span class="del" index="'+i+'">取消选择</span></div>';// 添加图片到弹出层已选商品列表容器
}
else{
tr[i].className = '';
}
}
selectedTotal.innerHTML = selected; // 已选数目
priceTotal.innerHTML = price.toFixed(2); // 总价
selectedViewList.innerHTML = html;
if (selected==0) {
foot.className = 'foot';
}
}

// 计算单行价格
function getSubtotal(tr) {
var cells = tr.cells;
var price = cells[2]; //单价
var subtotal = cells[4]; //小计td
var countInput = tr.getElementsByTagName('input')[1]; //数目input
var span = tr.getElementsByTagName('span')[1]; //-号
//写入HTML
subtotal.innerHTML = (parseInt(countInput.value) * parseFloat(price.innerHTML)).toFixed(2);
//如果数目只有一个，把-号去掉
if (countInput.value == 1) {
span.innerHTML = '';
}else{
span.innerHTML = '-';
}
}

// 点击选择框
for(var i = 0; i < selectInputs.length; i++ ){
selectInputs[i].onclick = function () {
if (this.className.indexOf('check-all') >= 0) { //如果是全选，则吧所有的选择框选中
for (var j = 0; j < selectInputs.length; j++) {
selectInputs[j].checked = this.checked;
}
}
if (!this.checked) { //只要有一个未勾选，则取消全选框的选中状态
for (var i = 0; i < checkAllInputs.length; i++) {
checkAllInputs[i].checked = false;
}
}
getTotal();//选完更新总计
}
}

// 显示已选商品弹层
selected.onclick = function () {
if (selectedTotal.innerHTML != 0) {
foot.className = (foot.className == 'foot' ? 'foot show' : 'foot');
}
}

//已选商品弹层中的取消选择按钮
selectedViewList.onclick = function (e) {
var e = e || window.event;
var el = e.srcElement;
if (el.className=='del') {
var input = tr[el.getAttribute('index')].getElementsByTagName('input')[0]
input.checked = false;
input.onclick();
}
}

//为每行元素添加事件
for(var i = 0; i < tr.length; i++){
//将点击事件绑定到tr元素
tr[i].onclick = function(e){
var e = e || window.event;
var el = e.target || e.srcElement; //通过事件对象的target属性获取触发元素
var cls = el.className; //触发元素的class
var countInout = this.getElementsByTagName('input')[1]; // 数目input
var value = parseInt(countInout.value); //数目
//通过判断触发元素的class确定用户点击了哪个元素
switch(cls){
case 'add'://点击了加号
countInout.value = value + 1;
getSubtotal(this);
break;
case 'reduce':
if (value > 1) {
countInout.value = value - 1;
getSubtotal(this);
}
break;
case 'delete': //点击了删除
var conf = confirm('确定删除此商品吗？');
if (conf) {
this.parentNode.removeChild(this);
}
break;
}
getTotal();
}

// 给数目输入框绑定keyup事件
tr[i].getElementsByTagName('input')[1].onkeyup = function () {
var val = parseInt(this.value);
if(isNaN(val) || val <=0){
val = 1;
}
if(this.value != val){
this.value = val;
}
getSubtotal(this.parentNode.praentNode);//更新小计
getTotal();//更新总数
}

// 点击全部删除
deleteAll.onclick = function () {

if(selectedTotal.innerHTML !=0) {
var conf = confirm('确定删除所选商品吗？');
if(conf){
for(var i = 0; i < tr.length; i++){
// 如果被选中，就删除相应的行
if(tr[i].getElementsByTagName('input')[0].checked){
tr[i].parentNode.removeChild(tr[i]);//删除节点
i--;//回退下标位置
}
}
}
}
else{
alert('请选择商品！');
}
getTotal(); //更新总数
}

// 默认全选
checkAllInputs[0].checked = true;
checkAllInputs[0].onclick();
}
}