一个购物车的写法

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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>demo</title>
<style type="text/css">
*{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}
td,th{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 .reduce,.count input{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:700}
.operation{width:80px}
.operation span:hover,a:hover{cursor:pointer;color:red;text-decoration:underline}
img{width:100px;height:80px;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 a,.foot div{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:700;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:700}
.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:#fff;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:#fff;position:absolute;left:0;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:#fff;font-size:12px;position:absolute;top:0;right:0;width:60px;height:18px;line-height:18px;text-align:center;background:RGBA(0,0,0,.5);cursor:pointer}
#selectedViewList div:hover span{display:block}
</style>
<script type="text/javascript">
window.onload = function () {
    if (!document.getElementsByClassName) {
        document.getElementsByClassName = function (cls) {
            var ret = [];
            var els = document.getElementsByTagName('*');
            for (var i = 0, len = els.length; i < len; i++) {
 
                if (els[i].className.indexOf(cls + ' ') >=0 || els[i].className.indexOf(' ' + cls + ' ') >=0 || els[i].className.indexOf(' ' + cls) >=0) {
                    ret.push(els[i]);
                }
            }
            return ret;
        }
    }
 
    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); //计算已选商品数目
                price += parseFloat(tr[i].getElementsByTagName('td')[4].innerHTML); //计算总计价格
                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': //点击了减号
                    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.parentNode); //更新小计
            getTotal(); //更新总数
        }
    }
 
    // 点击全部删除
    deleteAll.onclick = function () {
        if (selectedTotal.innerHTML != 0) {
            var con = confirm('确定删除所选商品吗？'); //弹出确认框
            if (con) {
                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]); // 删除相应节点
                        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();
}
</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="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="images/2.jpg" alt=""/><span>Canon/佳能 PowerShot SX50 HS</span></td>
            <td class="price">3888.50</td>
            <td class="count"><span class="reduce"></span><input class="count-input" type="text" value="1"/><span class="add">+</span></td>
            <td class="subtotal">3888.50</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="images/3.jpg" alt=""/><span>Sony/索尼 DSC-WX300</span></td>
            <td class="price">1428.50</td>
            <td class="count"><span class="reduce"></span><input class="count-input" type="text" value="1"/><span class="add">+</span></td>
            <td class="subtotal">1428.50</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="images/4.jpg" alt=""/><span>Fujifilm/富士 instax mini 25</span></td>
            <td class="price">640.60</td>
            <td class="count"><span class="reduce"></span><input class="count-input" type="text" value="1"/><span class="add">+</span></td>
            <td class="subtotal">640.60</td>
            <td class="operation"><span class="delete">删除</span></td>
        </tr>
    </tbody>
</table>
<div class="foot" id="foot">
    <label class="fl select-all"><input type="checkbox" class="check-all check"/> 全选</label>
    <a class="fl 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>
    <div class="selected-view">
        <div id="selectedViewList" class="clearfix">
            <div><img src="images/1.jpg"><span>取消选择</span></div>
        </div>
        <span class="arrow">◆<span>◆</span></span>
    </div>
</div>
</body>
</html>